Overview
Discovery of a comet, that is finding a new comet nobody has ever
known before for the first time in the world.
Some comets are rotating around the Sun and returns repeatedly. They
are called periodic comets. It is not a discovery if you catch a
returning periodic comet.
But actually, it is often impossible to predict the return of a
periodic comet because the orbital elements are uncertain or it has
been lost for a long time. Such a periodic comet comes to be
discovered several times whenever it returns.
When was such a periodic comet discovered indeed? Here I consider the
definition of "discovery" of a periodic comet based on the past cases.
I also derive and verify the naming rule of a periodic comet from this
definition of "discovery".
Analysis
Discovery of a periodic comet
Analyzing the cases of past periodic comet discoveries, I derive the
definition of "discovery" of a periodic comet as follows.
-
When a comet was discovered and its periodicity was calculated, it
is recognized as "discovery" as a periodic comet.
-
Even if a comet has been discovered before, it is not recognized as
"discovery" as a periodic comet if its periodicity was not
calculated.
-
Ex: Record of 1P/Halley in 240 B.C. in China.
Not called as 1P/Chinese Comet.
-
Ex: Discovery by La Hire in 1678.
Not called as 6P/La Hire, but 6P/d'Arrest.
-
Even if the period is uncertain and it has been lost, the comet has
been already "discovered" as a periodic comet. Even if it comes to
be accidentally discovered later, it is not recognized as
"discovery" as a periodic comet.
-
Ex: Discovery of D/de Vico in 1995.
Not called as 122P/de Vico-Nakamura-Tanaka.
-
If it has been discovered as an asteroid before, and the periodicity
has been already calculated, it is recognized as "discovery" as a
periodic comet. Even if it is discovered as a new comet later, it is
recognized that the cometary activity of a known asteroid is detected.
-
Ex: Discovery of Comet P/2017 B1 by PanSTARRS in 2017.
Because the periodicity of Asteroid 2010 EY90 discovered by Lemmon
has been already calculated, not called as 349P/Lemmon-PanSTARRS,
but 349P/Lemmon.
-
If it has been discovered as an asteroid before, and the periodicity
has not been calculated yet, it is not recognized as "discovery" as a
periodic comet. When it comes to be accidentally discovered as a comet
later, this is recognized as "discovery" as a periodic comet.
-
Ex: Discovery of Asteroid 1925 QD by Shajn in 1925.
Not called as 36P/Shajn-Whipple, but 36P/Whipple.
Note that here I derive the definition to determine only one
apparition recognized as "discovery" as a periodic comet among many
recorded apparitions. I do not describe on the priority among
discoverers in one apparition.
In this definition, "discovery" as a periodic comet does not mean the
time when the object was found for the first time in the world. There
can be some records of apparitions before the "discovery".
In this definition, "discovery" as a periodic comet does not coincide
with the time when people actually become aware of the comet. For
example, the "discovery" as a periodic comet of Comet D/1977 C1
( Skiff-Kosai ) is in 1976 based on this definition, however, it was
announced in 1986. The perihelion passage in 1984 is a return after
the "discovery", but actually, nobody knew about this comet at that
time.
Naming of a periodic comet
Based on the definition of "discovery" as a periodic comet mentioned
above, I derive the definition of naming of a periodic comet as
follows.
-
A periodic comet is named after the discoverers recognized when it
was "discovered" as a periodic comet.
-
If the object has been discovered before it was "discovered" as a
periodic comet, it is named as follows.
-
If they were identified at the same time when it was
"discovered" as a periodic comet, it is named after the
discoverers in both cases.
-
Ex: When P/1858 E1 ( Winnecke ) was discovered, it was
identified with C/1819 L1 ( Pons ) at the same time.
Named as 7P/Pons-Winnecke.
-
If it was "discovered" as a periodic comet because identified
with other comets, it can be named after the calculator.
-
If it was "discovered" as a periodic comet, then it was
identified with other comets after that, the names of the
discoverers in the latter cases are deleted, even if they have
discovered the comet before "discovered" as a periodic comet.
-
Ex: 6P/d'Arrest was discovered in 1851, then it was
identified with C/1678 R1 ( La Hire ).
Not renamed as 6P/La Hire-d'Arrest, but remained as
6P/d'Arrest.
-
If it was "discovered" as a periodic comet, it became lost, and then
it was accidentally rediscovered again, it is named as follows.
-
Until 1994, the names of the rediscoverers are added.
-
Ex: Rediscovery of D/Metcalf by Brewington in 1991.
Renamed as 97P/Metcalf-Brewington.
-
Since 1995, the names of the rediscoverers are not added.
-
Ex: Rediscovery of D/de Vico in 1995.
Not renamed as 122P/de Vico-Nakamura-Tanaka, but
remained as 122P/de Vico.
Consideration
Here I evaluate the definition mentioned above on the periodic comets
which have been discovered several times, and verify the definition.
All apparitions were recorded since 240 B.C. But the ancient
apparitions were only recorded. The orbital elements were calculated
in the Middle Ages, but they were parabolic and no periodicity was
calculated.
After the apparition in 1682, Halley identified three comets, C/1531
P1, C/1607 S1, C/1682 Q1, and calculated the periodicity for the
first time. Therefore it was discovered as a periodic comet at the
apparition in 1682.
It was discovered in 1786 by Mechain, in 1795 by Herschel, in 1805
by Pons, Huth, Bouvard, in 1818 by Pons respectively.
After the apparition in 1819, Encke identified these comets and
calculated the periodicity for the first time. Therefore it was
discovered as a periodic comet at the apparition in 1819.
It was discovered in 1772 by Montaigne, in 1805 by Pons, in 1826 by
Biela respectively.
Gauss has identified the two comets in 1772 and 1805, and calculated
the periodicity already in 1806. Therefore it was discovered as a
periodic comet at the apparition in 1805, discovered by Pons. The
discovery in 1826 by Biela is recognized as recovery.
This definition derives the name of this comet should be
3D/Montaigne-Pons-Biela.
Comet in 1678 discovered by La Hire was identified with 6P/d'Arrest
in 1990.
No periodicity was calculated for the comet in 1678. Therefore it
was discovered as a periodic comet at the apparition in 1851,
discovered by d'Arrest, and the name of La Hire was deleted.
It was discovered in 1819 by Pons, in 1858 by Winnecke
respectively. They were identified at the discovery in 1858.
No periodicity was calculated in 1819. Therefore it was discovered
as a periodic comet at the apparition in 1858, discovered by
Winnecke.
It was discovered in 1790 by Mechain, in 1858 by Tuttle
respectively. They were identified at the discovery in 1858.
No periodicity was calculated in 1790. Therefore it was discovered
as a periodic comet at the apparition in 1858, discovered by
Tuttle.
This definition derives the name of this comet should be
8P/Mechain-Tuttle.
It was discovered in 1869 by Tempel. The periodicity was
calculated. Therefore it was discovered as a periodic comet at that
time. The discovery in 1880 by Swift is recognized as recovery.
The names of the rediscoverers must not be added to the comet in 2001.
Therefore the name of this comet should be 11P/Tempel-Swift.
It was discovered in 1812 by Pons. The periodicity was calculated.
Therefore it was discovered as a periodic comet at that time. The
discovery in 1883 by Brooks is recognized as recovery.
It was discovered in 1869 by Perrine. The periodicity was
calculated. Therefore it was discovered as a periodic comet at that
time. The discovery in 1955 by Mrkos is recognized as recovery.
It was discovered in 1900 by Giacobini. The periodicity was
calculated. Therefore it was discovered as a periodic comet at that
time. The discovery in 1913 by Zinner is recognized as recovery.
It was discovered in 1847 by Brorsen. The periodicity was
calculated. Therefore it was discovered as a periodic comet at that
time. The discovery in 1919 by Metcalf is recognized as recovery.
It was discovered in 1902 by Grigg, in 1922 by Skjellerup
respectively. They were identified at the discovery in 1922.
No periodicity was calculated in 1902. Therefore it was discovered
as a periodic comet at the apparition in 1922, discovered by
Skjellerup.
It was discovered in 1818 by Pons, in 1873 by Coggia, Winnecke, in
1928 by Yamasaki, Forbes respectively.
No periodicity was calculated in 1818. But in 1873, the comets in
1818 and 1873 were identified and the periodicity was calculated.
Therefore it was discovered as a periodic comet at the apparition in
1873, discovered by Coggia, Winnecke.
Not similar to the cases of 1P/Halley and 2P/Encke, Crommelin
researched the orbit after it was discovered as a periodic comet.
Therefore, this definition derives the name of this comet should be
27P/Pons-Coggia-Winnecke-Yamasaki-Forbes.
It was discovered in 1788 by Herschel, in 1939 by Rigollet
respectively. They were identified at the discovery in 1939.
No periodicity was calculated in 1788. Therefore it was discovered
as a periodic comet at the apparition in 1939, discovered by
Rigollet.
Asteroid 1925 QD discovered by Shajn was identified with 36P/Whipple
in 1987.
No periodicity was calculated for Asteroid 1925 QD. Therefore it was
discovered as a periodic comet at the apparition in 1933, discovered
by Whipple, and the name of Shajn was rejected.
It was discovered in 1867 by Stephan. The periodicity was
calculated. Therefore it was discovered as a periodic comet at that
time. The discovery in 1942 by Oterma is recognized as recovery.
It was discovered in 1858 by Tuttle, in 1907 by Giacobini, in 1951
by Kresak respectively.
The periodicity was calculated in 1858. Therefore it was discovered
as a periodic comet at that time. The discoveries in 1907 by
Giacobini and in 1951 by Kresak are recognized as recovery.
It was discovered in 1924 by Wolf. The periodicity was calculated.
Therefore it was discovered as a periodic comet at that time. The
discovery in 1951 by Harrington is recognized as recovery.
It was discovered in 1844 by de Vico. The periodicity was
calculated. Therefore it was discovered as a periodic comet at that
time. The discovery in 1894 by Swift is recognized as recovery.
The names of the rediscoverers must not be added to the comet in 2002.
Therefore the name of this comet should be 54P/de Vico-Swift.
It was discovered in 1889 by Swift. The periodicity was calculated.
Therefore it was discovered as a periodic comet at that time. The
discovery in 1973 by Gehrels is recognized as recovery.
It was discovered in 1881 by Denning. The periodicity was
calculated. Therefore it was discovered as a periodic comet at that
time. The discovery in 1978 by Fujikawa is recognized as recovery.
Asteroid 1967 EU was identified with 74P/Smirnova-Chernykh in 1980s.
No periodicity was calculated for Asteroid 1967 EU. Therefore it was
discovered as a periodic comet at the apparition in 1975, discovered
by Smirnova, Chernykh, and the names of the discoverers of Asteroid
1967 EU were rejected.
It was discovered in 1945 by du Toit. The periodicity was
calculated. Therefore it was discovered as a periodic comet at that
time. The discovery in 1982 by Hartley is recognized as recovery.
It was discovered in 1846 by Peters. The periodicity was
calculated. Therefore it was discovered as a periodic comet at that
time. The discovery in 1982 by Hartley is recognized as recovery.
It was discovered in 1906 by Metcalf. The periodicity was
calculated. Therefore it was discovered as a periodic comet at that
time. The discovery in 1991 by Brewington is recognized as recovery.
Comet in 1973 discovered by Boethin was identified with 104P/Kowal 2
in 2003.
No periodicity was calculated for the comet in 1973. Therefore it
was discovered as a periodic comet at the apparition in 1979,
discovered by Kowal, and the name of Boethin was rejected.
It was discovered in 1949 by Wilson, Harrington as a comet D/1949 W1.
Then it was discovered in 1979 by Helin as an asteroid 1979 VA.
Because the orbit of D/1949 W1 was uncertain and the comet had been
lost, they were considered as different objects.
The period of Asteroid 1979 VA was concluded and it was registered
as (4015). After that, Asteroid (4015) was identified with Comet
D/1949 W1.
However, Cunningham has calculated the periodicity already in 1949.
Therefore it was discovered as a periodic comet at that time, and
the name of Helin was rejected.
Comet in 1737 discovered by Kegler was identified with Comet
Swift-Tuttle in 1970s.
No periodicity was calculated for the comet in 1737. Therefore it
was discovered as a periodic comet at the apparition in 1869,
discovered by Swift, Tuttle, and the name of Kegler was deleted.
It was discovered in 1995 by Nakamura, Tanaka, Utsunomiya, Seki,
Machholz. But it was identified with Comet D/de Vico discovered in
1846.
The periodicity was calculated in 1846. Therefore it was discovered
as a periodic comet at that time, and the names of rediscoverers in
1995 were rejected.
Asteroid 1979 OW7 was identified with 133P/Elst-Pizarro later.
No periodicity was calculated for Asteroid 1979 OW7. The period of
this asteroid was concluded and it was registered as (7968) after
the identification. Therefore it was discovered as a periodic comet
at the apparition in 1996, discovered by Elst, Pizarro, and the
names of the discoverers of Asteroid 1979 OW7 were rejected.
Asteroid 1939 TN discovered by Vaisala, Oterma was revealed to be a
comet in 1981.
After that, Asteroid 1998 WG22 discovered by LINEAR was identified
with 1939 TN.
The periodicity was calculated already in 1981. Therefore it was
discovered as a periodic comet at the apparition in 1939, discovered
by Vaisala, Oterma, and the name of LINEAR was rejected.
The names of the rediscoverers must not be added to the comet in 2000.
Therefore the name of this comet should be 146P/Shoemaker.
It was discovered in 1963 by Anderson. The periodicity was
calculated. Therefore it was discovered as a periodic comet at that
time.
The names of the rediscoverers must not be added to the comet in 2000.
Therefore the name of this comet should be 148P/Anderson.
Comet in 2002 discovered by Ikeya, Zhang, Raymundo was identified
with Comet in 1661 observed by Hevelius.
No periodicity was calculated for the comet in 1661. Therefore it
was discovered as a periodic comet at the apparition in 2002.
The comet in 1661 had no official name. But it was identified at the
same time when this comet was discovered as a periodic comet.
Therefore, if it had been named after Hevelius, the name of this
comet would have been 153P/Hevelius-Ikeya-Zhang.
It was discovered in 1986 by Russell as a comet, in 1993 by
Shoemaker as Asteroid 1993 WU, in 2000 as Asteroid 2000 QD181
respectively.
The comet in 1986 was not confirmed whether real or false. Asteroid
1993 WU had been lost because the orbital elements were uncertain.
Therefore these three were considered as different objects at the
discovery of 2000 QD181.
In 2001, Asteroids 1993 WU and 2000 QD181 were identified. But the
orbital elements were not concluded and the asteroid was not
numbered at that time.
In 2003, this asteroid was identified with the comet in 1986. Then
this object was discovered as a periodic comet by this
identification. Therefore it was discovered as a periodic comet at
the apparition in 2000, discovered by LINEAR.
No periodicity was calculated in 1986. The comet in 1986 was
identified at the same time when the object was discovered as a
periodic comet. Therefore the name of this comet is definitely
156P/Russell-LINEAR.
It was discovered in 1979 by Kowal as Comet C/1979 O1, in 2001 by
LINEAR as Asteroid 2001 RG100 respectively.
In 2003, the asteroid in 2001 was revealed to be a comet, and it was
identified with the comet in 1979.
No periodicity was calculated in 1979. Therefore it was discovered
as a periodic comet at the apparition in 2001, discovered by
LINEAR.
The comet in 1979 was identified at the same time when the object
was discovered as a periodic comet. Therefore the name of this comet
is definitely 158P/Kowal-LINEAR.
It was discovered in 2002 by NEAT as Asteroid 2002 EX12. It was
revealed to be a comet in 2005.
It was not accidentally discovered as a new comet. Therefore it was
discovered as a periodic comet at the apparition in 2001, although
originally discovered as an asteroid.
It was discovered in 2000 by Spacewatch as Asteroid 2000 EC98. After
it was registered as Asteroid (60558), it was revealed to be a comet
in 2005.
It was not accidentally discovered as a new comet. Therefore it was
discovered as a periodic comet at the apparition in 2015, although
originally discovered as an asteroid. However, it is in the same
apparition in 2015, when it was revealed to be a comet.
It was discovered in 1999 by LINEAR as Asteroid 1999 RE70. After
it was registered as Asteroid (118401), it was revealed to be a
comet in 2006.
It was not accidentally discovered as a new comet. Therefore it was
discovered as a periodic comet at the apparition in 2000, although
originally discovered as an asteroid.
It was discovered in 1892 by Barnard. The periodicity was
calculated. Therefore it was discovered as a periodic comet at that
time.
The names of the rediscoverers must not be added to the comet in 2008.
Therefore the name of this comet should be 206P/Barnard.
It was discovered in 1783 by Pigott. The periodicity was
calculated. Therefore it was discovered as a periodic comet at that
time.
When it was rediscovered in 2003 by LINEAR, the identification with a
comet discovered in 1783 by Pigott was not concluded.
When it was rediscovered in 2009 by Kowalski, the identification was concluded.
The names of the rediscoverers must not be added to the comet in 2003.
Therefore the name of this comet should be 226P/Pigott.
It was discovered in 1960 by van Houten. The periodicity was
calculated. Therefore it was discovered as a periodic comet at that
time.
The names of the rediscoverers must not be added to the comet in 2012.
Therefore the name of this comet should be 271P/van Houten.
It was discovered in 1931 by Tombaugh. The periodicity was
calculated. Therefore it was discovered as a periodic comet at that
time.
The names of the rediscoverers must not be added to the comet in 2012.
Therefore the name of this comet should be 274P/Tombaugh.
When it was discovered as a comet by PanSTARRS in 2014, it was
identified with Asteroid 2007 RJ236 discovered by Lemmon in 2007.
No periodicity was calculated for Asteroid 2007 RJ236. The
periodicity was calculated by this identification, and it was
recognized as a periodic comet. Therefore it was discovered as a
periodic comet at the apparition in 2016, discovered by PanSTARRS.
It was identified at the same time when the object was discovered as
a periodic comet. Therefore the name of this comet is definitely
302P/Lemmon-PanSTARRS.
It was discovered as a comet in 2016 by PanSTARRS. Then the
periodicity was calculated, and it was identified with a comet
discovered by Wiegert in 2007.
No periodicity was calculated in 2007. Therefore it was discovered
as a periodic comet at the apparition in 2015, discovered by
PanSTARRS.
The comet in 2007 was identified at the same time when the object
was discovered as a periodic comet. Therefore the name of this comet
is definitely 351P/Wiegert-PanSTARRS.
A comet discovered in 2013 by PanSTARRS and a comet discovered in
2019 by Fuls were identified in 2020.
The periodicity was calculated in 2013. Therefore it was discovered
as a periodic comet in 2013.
Therefore the name of this comet should be PanSTARRS.
When it was discovered as a comet by PanSTARRS in 2021, it was
identified with Asteroid 2011 UE215 discovered by Lemmon in 2011.
No periodicity was calculated for Asteroid 2011 UE215. The
periodicity was calculated by this identification, and it was
recognized as a periodic comet. Therefore it was discovered as a
periodic comet at the apparition in 2021, discovered by PanSTARRS.
It was identified at the same time when the object was discovered as
a periodic comet. Therefore the name of this comet is definitely
437P/Lemmon-PanSTARRS.
This comet was announced as 437P/PanSTARRS at fist, but later, it
was renamed as 437P/Lemmon-PanSTARRS.
When it was discovered as a comet by Christensen in 2022, the
periodicity was calculated. And it was announced as P/2022 E1
( Christensen ).
After that, it was identified with Asteroid 2015 PO210 discovered by
PanSTARRS in 2015.
No periodicity was calculated for Asteroid 2015 PO210. And it was
identified after it was discovered as a periodic comet P/2022 E1
( Christensen ).
Therefore the name of this comet should be Christensen.
When it was discovered as an asteroid by PanSTARRS in 2016, it was
identified with Asteroid 2010 LK36 discovered by WISE in 2010, and
the periodicity was calculated.
But it was not revealed to a comet at tht time.
It was revealed to be a comet at the apparition in 2022.
It was not accidentally discovered as a new comet. Therefore it was
discovered as a periodic comet at the apparition in 2016, although
originally discovered as an asteroid.
It was identified at the same time when the object was discovered as
a periodic comet. Therefore the name of this comet is definitely
P/WISE-PanSTARRS.
When it was discovered as a comet by PanSTARRS in 2022, the
periodicity was calculated. And it was announced as P/2022 M1
( PanSTARRS ).
After that, it was identified with Asteroid 2000 OZ21 discovered by
LONEOS in 2000.
The periodicity of Asteroid 2000 OZ21 was calculated in 2000.
Therefore it was discovered as a periodic comet in 2000.
Therefore the name of this comet should be LONEOS.
Appendix
Difference between naming by this definition and official name
| No. | Official Name | Naming by This Definition |
|---|
| 3D | Biela | Montaigne-Pons-Biela |
| 8P | Tuttle | Mechain-Tuttle |
| 11P | Tempel-Swift-LINEAR | Tempel-Swift |
| 27P | Crommelin | Pons-Coggia-Winnecke-Yamasaki-Forbes |
| 54P | de Vico-Swift-NEAT | de Vico-Swift |
| 146P | Shoemaker-LINEAR | Shoemaker |
| 148P | Anderson-LINEAR | Anderson |
| 206P | Barnard-Boattini | Barnard |
| 226P | Pigott-LINEAR-Kowalski | Pigott |
| 271P | van Houten-Lemmon | van Houten |
| 274P | Tombaugh-Tenagra | Tombaugh |
| 407P | PanSTARRS-Fuls | PanSTARRS |
| 443P | PanSTARRS-Christensen | Christensen |
| P/2000 OZ21 = P/2022 M1 | LONEOS-PanSTARRS | LONEOS |
Periodic comets including the recoverers' names
| No. | Official Name | Naming Excluding the Recoverers' Names |
|---|
| 3D | Biela | Montaigne-Pons |
| 11P | Tempel-Swift-LINEAR | Tempel |
| 12P | Pons-Brooks | Pons |
| 18D | Perrine-Mrkos | Perrine |
| 21P | Giacobini-Zinner | Giacobini |
| 23P | Brorsen-Metcalf | Brorsen |
| 27P | Crommelin | Pons-Coggia-Winnecke |
| 38P | Stephan-Oterma | Stephan |
| 41P | Tuttle-Giacobini-Kresak | Tuttle |
| 43P | Wolf-Harrington | Wolf |
| 54P | de Vico-Swift-NEAT | de Vico |
| 64P | Swift-Gehrels | Swift |
| 72P | Denning-Fujikawa | Denning |
| 79P | du Toit-Hartley | du Toit |
| 80P | Peters-Hartley | Peters |
| 97P | Metcalf-Brewington | Metcalf |
| 146P | Shoemaker-LINEAR | Shoemaker |
| 148P | Anderson-LINEAR | Anderson |
| 206P | Barnard-Boattini | Barnard |
| 226P | Pigott-LINEAR-Kowalski | Pigott |
| 271P | van Houten-Lemmon | van Houten |
| 274P | Tombaugh-Tenagra | Tombaugh |
| 407P | PanSTARRS-Fuls | PanSTARRS |
| P/2000 OZ21 = P/2022 M1 | LONEOS-PanSTARRS | LONEOS |
Rediscoveries of periodic comets since 1995
| Designation | No. | Name | Rediscoverers |
|---|
| P/1995 S1 | 122P | de Vico | Nakamura, Utsunomiya, Tanaka, Machholz, Seki |
| P/1998 WG22 | 139P | Vaisala-Oterma | LINEAR |
| P/1998 X2 | 140P | Bowell-Skiff | Williams, LINEAR |
| P/2000 ET90 | 143P | Kowal-Mrkos | LINEAR |
| P/2000 S2 | 146P | Shoemaker-LINEAR | LINEAR |
| P/2000 SO253 | 148P | Anderson-LINEAR | LINEAR |
| P/2001 X3 | 11P | Tempel-Swift-LINEAR | LINEAR |
| P/2002 T4 | 54P | de Vico-Swift-NEAT | NEAT |
| P/2003 A1 | 226P | Pigott-LINEAR-Kowalski | LINEAR |
| P/2003 T1 | 157P | Tritton | Juels, Holvercem |
| P/2003 WY25 | 289P | Blanpain | Catalina Sky Survey, PanSTARRS |
| P/2006 B7 | 198P | ODAS | Williams |
| P/2006 M3 | 177P | Barnard 2 | LINEAR |
| P/2007 A1 | 184P | Lovas 2 | Kowalski |
| P/2008 R6 | 205P | Giacobini | Itagaki, Kaneda |
| P/2008 T3 | 206P | Barnard-Boattini | Boattini |
| P/2008 X4 | 210P | Christensen | Watson |
| P/2009 MB9 | 222P | LINEAR | McNaught |
| P/2009 R2 | 226P | Pigott-LINEAR-Kowalski | Kowalski |
| P/2012 A3 | P/2003 T12 | SOHO | Watson |
| P/2012 TB36 | 271P | van Houten-Lemmon | Larson |
| C/2012 V4 | 273P | Pons-Gambart | Matson |
| P/2012 WX32 | 274P | Tombaugh-Tenagra | Schwartz, Holvorcem |
| P/2012 Y2 | 275P | Hermann | PanSTARRS |
| P/2016 Q3 | 345P | LINEAR | Kowalski |
| P/2017 U6 | 365P | PanSTARRS | Fuls |
| P/2019 Y2 | 407P | PanSTARRS-Fuls | Fuls |
References
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