Weekly Information about Bright Comets (2007 June 23: North)

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Updated on June 26, 2007
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Best time and the azimuth, altitude (A,h) are at lat. 35 deg in the Northern Hemisphere.

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* C/2006 VZ13 ( LINEAR )

Already bright as 8.8 mag (June 26, Juan Jose Gonzalez). It is brightening rapidly now, and will reach to 8 mag in July. However, it moves southwards very fast in August. It is only observable until mid August in the Northern Hemisphere. On the other hand, it keeps low and hard to observe until mid July in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 23  22 24.56   57 11.8   0.949   1.302    82   10.3   3:00 (206, 64)  
June 30  21 11.50   65 20.6   0.766   1.234    86    9.5   2:46 (180, 60)  

* C/2007 E2 ( Lovejoy )

It passed near by the earth in mid April, and reached to 7.6 mag (Apr. 18, Juan Jose Gonzalez). It locates high in the evening sky, and it is observable in good condition. But it already faded won to 11.3 mag (May 26, Seiichi Yoshida). It keeps observable in good condition in the Northern Hemisphere until the comet has gone. It will be visible visually until July.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 23  13 20.61   61 53.2   1.655   1.750    77   12.2  21:04 (156, 58)  
June 30  13 15.94   60 50.9   1.811   1.830    74   12.6  21:04 (150, 56)  

* C/2007 E1 ( Garradd )

It passed near by the earth in early April, and reached to 8.7 mag (Apr. 10, Werner hasubick). Then it faded down to 11.8 mag on May 26 (Seiichi Yoshida), and became too low to observe in the evening. Now it is not observable. It will appear in the morning sky again at 15 mag in August.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 23   7 15.87   24 11.4   2.308   1.363    16   12.4  21:04 (126, -7)  
June 30   7 14.36   24 28.9   2.393   1.400     9   12.7  21:04 (131,-11)  

* C/2006 P1 ( McNaught )

Excellent great comet, few times in a lifetime, for southern people. It reached to -5.5 mag on Jan. 14 and 15, brighter than Venus, and visible even in daytime. Then it appeared in the evening sky in the Southern Hemisphere and many people enjoyed a fantastic view of a beautiful great comet, a enormous curving tail with so many striae over 50 degrees. Now it is observable both in the evening and morning. It has already faded down to 12.3 mag (June 9, Masayuki Suzuki). In the Southern Hemisphere, It keeps observable almost all night until the comet has gone. It will never be observable again in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 23  11 18.53  -76  5.1   2.599   3.097   109   12.4  21:04 ( 13,-27)  
June 30  11 42.35  -73 56.7   2.714   3.190   108   12.7  21:04 ( 15,-26)  

* 2P/Encke

It had been observed while brightening rapidly until the perihelion passage on Apr. 19, although it located extremely low in the evening sky. It reached to 6.7 mag on Apr. 17 (Juan Jose Gonzalez). In the Southern Hemisphere, it appeared in the morning sky at 7.8 mag in early May (May 9, Alexandre Amorim). Now it is 8.6 mag (May 11, Con Stoitsis). Then it is fading rapidly. Now it is 10.9 mag (May 27, Ken-ichi Kadota). It became observable also in the Northern Hemisphere again. But it locates only 20 degree high at most, and it will be fading rapidly.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 23  22 54.71  -29 29.8   0.541   1.343   115   13.0   3:00 (334, 20)  
June 30  22 21.25  -32  4.6   0.563   1.441   129   13.5   3:02 (348, 22)  

* C/2006 XA1 ( LINEAR )

It became brighter than expected, and reached to 13.2 mag (May 12, Carlos Labordena). However, it is already not observable. In the Southen Hemisphere, it will be observable again at 15 mag in November. But in the Northern Hemisphere, it will never observable again.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 23   7 58.63   23 48.3   2.700   1.841    26   13.1  21:04 (119,  0)  
June 30   8 16.17   21 32.4   2.710   1.826    23   13.1  21:04 (119, -3)  

* C/2007 K5 ( Lovejoy )

New comet discovered in the Southern Hemisphere. In the Southern Hemisphere, it is observable in the evening sky until early August while the comet is fading gradually down to 16 mag. In the Northern Hemisphere, it is not observable until when the comet becomes fainter than 18 mag. It was not discovered in last autumn when the comet located in the good condition, so it may fade out rapidly after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 23   8  3.20  -13  4.2   1.900   1.411    46   13.9  21:04 ( 88,-20)  
June 30   8 32.24  -12 22.0   1.988   1.474    45   14.2  21:04 ( 89,-20)  

* 29P/Schwassmann-Wachmann 1

It had been bright as 12-13 mag and visible visually almost always from 2006 July to 2007 April. However, now it is not observable. It will appear in the morning sky again in late July.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 23   5 19.20   29 35.4   6.912   5.922    11   14.0   3:00 (226, -7)  
June 30   5 25.48   29 39.7   6.891   5.924    16   14.0   3:02 (230, -3)  

* C/2006 K4 ( NEAT )

Now it is 15.6 mag (May 27, Ken-ichi Kadota), brightening as expected. It will reach to 14.5 mag in 2007 summer. However, it moves in the southen sky. In the Northern Hemisphere, it becomes unobservable in July.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 23  20 22.62  -41 41.5   2.644   3.532   146   14.6   2:21 (  0, 13)  
June 30  20  9.58  -44 33.8   2.580   3.505   151   14.5   1:41 (  0, 11)  

* C/2005 L3 ( McNaught )

Now it is bright and visible visually at 14.1 mag (May 26, Seiichi Yoshida). It will be observable at 14.5 mag at high location from spring to summer both in 2007 and 2008.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 23  17 52.56   -3 35.8   4.826   5.791   159   14.6  23:46 (  0, 51)  
June 30  17 44.36   -3  6.4   4.831   5.778   156   14.6  23:11 (  0, 52)  

* 17P/Holmes

It appeared in the morning sky. It is bright as 14.9 mag (May 25, Ken-ichi Kadota). It will be getting higher gradually after this, and it will keep bright as 15 mag and observable in good condition for a long time until autumn.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 23   1 50.31   23 18.6   2.445   2.090    57   14.6   3:00 (260, 27)  
June 30   2  3.18   25 19.9   2.396   2.101    61   14.7   3:02 (260, 32)  

* C/2006 Q1 ( McNaught )

It will reach to 11 mag in 2008 spring. It will keep bright for a long time, however, it keeps moving in the southern sky for a while after this. In the Southern Hemisphere, now it is low temporarily. But it will be high after July, then it keeps observable in good condition until 2008 summer. In the Northern Hemisphere, it will appear at 13 mag in November in a short time, but very low and hard to observe. However, it will be visible visually at 11 mag in the evening sky from March to June in 2008. Then it becomes unobservable again. But it will appear in the morning sky again at 13 mag at the end of 2008, then it keeps bright and observable for a while.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 23   6 24.64  -26  1.7   5.197   4.605    49   15.0  21:04 ( 88,-47)  
June 30   6 33.41  -26  5.0   5.152   4.555    49   14.9   3:02 (270,-51)  

* P/2007 H1 ( McNaught )

New periodic comet. Now it is bright as 15.2 mag (June 4, Ken-ichi Kadota). It will be observable in very good condition at 14 mag from summer to autumn. It may be visible visually. However, it was not discovered at the previous apparition in 1999. So it may be bright temporarily in outburst.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 23  23 40.45   -3 11.9   1.962   2.315    96   15.1   3:00 (307, 37)  
June 30  23 48.71   -2 58.8   1.878   2.307   101   15.0   3:02 (313, 40)  

* 96P/Machholz 1

After the perihelion passage on Apr. 4, it appeared in the morning sky and it was so bright as 5.5 mag (Apr. 10, Michael Jager and Gerald Rhemann). Then it is fading rapidly. But it is bright as 13.7 mag still now (June 26, Juan Jose Gonzalez). Now the location is very good, so it will be bright for some more time.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 23  17 44.17   -1  3.8   0.791   1.772   157   15.2  23:36 (  0, 54)  
June 30  17 19.72   -4 26.4   0.905   1.873   154   15.8  22:45 (  0, 50)  

* C/2003 WT42 ( LINEAR )

It has been visible at 13.5 mag for a long time since 2005 autumn until 2006 spring. It was still bright and visible visually as 14.2 mag in winter (Dec. 22, Seiichi Yoshida). However, it has already faded down to 16.4 mag (May 26, Ken-ichi Kadota). Fine tail is visible on CCD images. It will be getting lower gradually after June, and will be too low to observe in September.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 23  12 38.36   18 14.1   6.042   6.130    90   15.4  21:04 ( 73, 53)  
June 30  12 39.75   17 25.6   6.170   6.157    84   15.5  21:04 ( 77, 47)  

* C/2006 L2 ( McNaught )

It kept 12 mag for over half a year since last June. It was still bright as 12.6 mag on Mar. 9 (Edwin van Dijk). But it has already started fading, and will be already too faint to see visually. However, the fading is slow. The comet will be fainter than 18 mag in 2008. In the Northern Hemisphere, it keeps observable until that time.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 23   4 54.94   65 41.3   3.844   3.188    43   15.5   3:00 (203, 21)  
June 30   5  7.05   65 18.1   3.895   3.247    44   15.6   3:02 (204, 23)  

* C/2006 OF2 ( Broughton )

It will reach to 10.5 mag and will be observable in good condition in 2008 autumn. Now it is 16.0 mag (May 22, Ken-ichi Kadota), brightening as expected. It keeps observable in good condition for a long time while the comet is getting brighter slowly.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 23  22  8.33   -9 55.3   4.546   5.137   120   15.7   3:00 (338, 42)  
June 30  22  7.19   -9 37.9   4.401   5.083   127   15.6   3:02 (348, 45)  

* P/2002 O5 ( NEAT )

First return of a new periodic comet discovered in 2002. Not recovered yet. However, it will pass very close to the earth and reach to 15 mag in July. Although it had been only observable in the Southern Hemisphere until June, it is moving northwards rapidly, and it becomes observable in good condition in the Northern Hemisphere after July. But it will fade out rapidly after August, and will be fainter than 18 mag in September.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 23  16  5.53  -48 40.4   0.262   1.241   145   16.0  22:01 (  0,  7)  
June 30  16 19.57  -40  5.7   0.230   1.216   147   15.7  21:48 (  0, 16)  

* C/2006 M4 ( SWAN )

It reached up to 4 mag in 2006 autumn. But it had faded down to 10.5 mag on Jan. 11 (Carlos Labordena). It had been unobservable for a long time since that, but now it is appearing at dawn again. Now it is 16.8 mag (May 27, Ken-ichi Kadota), fading rather rapidly. After this, it keeps observable until it becomes fainter than 18 mag in autumn.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 23  22 59.03  -17 30.0   3.443   3.932   111   16.1   3:00 (327, 31)  
June 30  22 55.21  -18 51.6   3.411   4.008   119   16.2   3:02 (336, 33)  

* C/2007 G1 ( LINEAR )

Now it is 17.3 mag (June 2, Ken-ichi Kadota). It will reach to 12 mag in 2008 summer. In the Northern Hemisphere, it keeps observable almost all time until that while the comet is brightening gradually. However, it goes to the southern sky and will never be observable again in the Northern Hemisphere after that.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 23  17 13.01   34 47.3   5.014   5.599   120   16.5  23:07 (  0, 90)  
June 30  17  6.47   34  3.8   4.981   5.546   119   16.4  22:33 (  0, 89)  

* C/2007 F1 ( LONEOS )

Now it is 18.2 mag (May 4, Ken-ichi Kadota). It will approach down to 0.4 A.U. to the sun on Oct. 28, and it is expected to reach to 6 mag. However, the condition in the Northern Hemisphere is very hard. It will be getting lower in the evening sky after this. The altitude becomes lower than 20 degree in early July, and lower than 10 degree in late July. The comet is still faint as 15.5 mag at that time. After conjunction with the sun, the comet will be brighter than 11 mag in late September, and will be 8 mag in mid October. But it locates extremely low, slightly over the horizon in the morning sky. It goes to the southern sky in late October, then it will never be observable again. In the Southern Hemisphere, it becomes unobservable in July. But it will appear in the evening sky at 7 mag in early November. Then it keeps observable while fading gradually, although it will not locate very high.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 23  10  4.65   28 59.7   2.915   2.451    53   16.7  21:04 (108, 27)  
June 30  10  6.65   28 55.8   2.911   2.351    47   16.5  21:04 (111, 22)  

* 44P/Reinmuth 2

Observed on June 12 by Joao Gregorio, but not officially announced yet. It should have already brightened up to 17 mag. It will be observable at 16.5 mag in summer and autumn in 2007, and observable at 17 mag in summer and autumn in 2008.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 23  17 43.94  -26 22.2   1.724   2.737   174   16.7  23:38 (  0, 29)  
June 30  17 37.67  -26  4.0   1.708   2.709   166   16.7  23:04 (  0, 29)  

* C/2005 S4 ( McNaught )

Now it is 17.2 mag (May 22, Ken-ichi Kadota). It will be observable at 16.5-17 mag in good condition in summer.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 23  20 39.37   14  3.4   5.188   5.853   126   16.7   2:37 (  0, 69)  
June 30  20 33.13   14 51.4   5.122   5.852   132   16.7   2:04 (  0, 70)  

* C/2002 VQ94 ( LINEAR )

Now it is 16.7 mag (May 27, Ken-ichi Kadota). It is outside of Jupiter's orbit. So it keeps 17 mag for a long time until 2007 summer. It keeps locating high and observable in good condition for a long time after this because it moves in the northern sky.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 23  13 41.00   34 42.1   7.370   7.521    94   17.0  21:04 ( 95, 72)  
June 30  13 39.64   33 44.4   7.473   7.540    89   17.0  21:04 ( 95, 66)  

* C/2006 M1 ( LINEAR )

It was observed around 17 mag in 2006 summer and autumn. It becomes observable in good condition at 17 mag again from summer to winter in 2007.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 23   2 18.37   36 48.7   4.312   3.740    50   17.2   3:00 (243, 28)  
June 30   2 26.77   36 55.0   4.263   3.760    54   17.2   3:02 (245, 32)  

* 50P/Arend

Not observed in this return yet. It is appearing in the morning sky now. It must be 17 mag already. It will reach to 15 mag and will be observable in good condition in autumn. Then it keeps observable until it becomes fainter than 18 mag in 2008 spring.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 23   1  3.84    5  7.4   2.291   2.243    74   17.4   3:00 (284, 27)  
June 30   1 14.12    6 58.3   2.188   2.213    78   17.2   3:02 (285, 32)  

* P/2006 F1 ( Kowalski )

Now it is 18.1 mag (Apr. 14, Maciej Reszelski). It is observable at 17.5-18 mag until autumn. It was discovered at 18 mag in 2006. It is a distant periodic comet, and it keeps observable at 18 mag for 4 years until 2009.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 23  19  8.32  -11 46.5   3.206   4.179   160   17.3   1:07 (  0, 43)  
June 30  19  4.28  -12 11.6   3.180   4.176   166   17.3   0:35 (  0, 43)  

* C/2006 WD4 ( Lemmon )

Originally considered as a peculiar asteroid, but revealed to be a comet. In the Southern Hemisphere, it became observable in late April. It approached to Sun down to 0.6 A.U. in late April, then it passed very near by Earth in May. It moved eastwards extremely fast, and it became observable in the evening sky on May 23 also in the Northeren Hemisphere. It keeps observable in the evening sky. It was predicted to fade out rapidly. However, it was 12.8 mag on May 24 (Alan Hale), 13.5-14.0 mag on June 6 (Michael Jager and Gerald Rhemann), so it is still bright. It is predicted to be fainter than 18 mag in late June. But it may be brighter than this ephemeris for a while.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 23  10 46.51   20 16.9   1.313   1.273    64   17.3  21:04 ( 94, 31)  
June 30  10 56.65   19 52.7   1.559   1.383    60   17.9  21:04 ( 96, 27)  

* P/1998 S1 ( LINEAR-Mueller )

First return of a new periodic comet discovered in 1998 at 14 mag. It was expected to reach to 15.5 mag in 2007 summer and autumn. But it has been not recovered yet. It was fainter than 22.5 mag in 2006 September (Carl Hergenrother). It must be much fainter than expected, by 4-5 mag or more. It can reach to 20 mag at best actually.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 23   0  5.59   -3 48.4   2.606   2.819    91   21.4   3:00 (302, 32)  
June 30   0 11.39   -2 59.1   2.499   2.800    96   21.3   3:02 (307, 37)  

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