Weekly Information about Bright Comets (2013 June 8: North)

Japanese version Home page	Updated on June 9, 2013
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Best time and the azimuth, altitude (A,h) are at lat. 35 deg in the Northern Hemisphere. Azimuth indicates 0 for south, 90 for west, 180 for north, 270 for east.

C/2011 L4 ( PanSTARRS ) It passed the perihelion on Mar. 10, and brightened up to 0-1 mag. Now it is fading. But it is still bright as 8.2 mag (June 5, Uwe Pilz). It is observable all night in the Northern Hemisphere. It is not observable in the Southern Hemisphere for a while after this. The Earth will pass through the comet's orbital plane on May 27, then the dust tail will look dense and straight. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 15 30.63 80 54.9 1.937 1.950 75 8.6 22:17 (180, 44) June 15 14 53.04 76 35.7 2.032 2.061 77 8.9 21:15 (180, 49) C/2012 F6 ( Lemmon ) It approached to the sun down to 0.73 A.U. on Mar. 24, and brightened up to 4.7 mag (Mar. 11, Michael Mattiazzo). Now it is fading. But it is still bright as 7.1 mag (June 5, Uwe Pilz). In the Northern Hemisphere, it will be getting higher gradually, then it keeps observable in good condition while fading gradually. In the Southern Hemisphere, it keeps locating low in the morning sky after this. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 0 19.01 38 47.6 1.758 1.560 61 9.2 3:00 (246, 40) June 15 0 15.53 44 3.4 1.774 1.659 66 9.7 2:58 (240, 47) 46P/Wirtanen It brightens up to 10 mag in summer. But the condition is worst and the comet will be hardly observable in this apparition. In the Northern Hemisphere, it will be observable in autumn when the comet will be fainter than 16 mag. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 3 53.65 16 8.5 2.056 1.134 17 11.7 3:00 (241,-11) June 15 4 22.66 18 11.8 2.031 1.103 17 11.3 2:58 (239,-11) C/2012 L2 ( LINEAR ) Now it is so bright as 10.5 mag (May 19, Chris Wyatt). In the Southern Hemisphere, it keeps observable for a long time until the comet fades out, although it keeps locating low. 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 8 6 15.52 -4 38.7 2.322 1.564 32 12.3 20:57 (102,-25) June 15 6 30.60 -7 32.2 2.332 1.593 33 12.4 21:02 (102,-30) 246P/2010 V2 ( NEAT ) It brightened up to 12 mag in 2012. It is bright as 14.1 mag still now (May 19, Chris Wyatt). It keeps 13-14 mag until autumn. It locates somewhat low in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 19 59.01 -30 22.1 2.109 2.963 140 12.9 2:54 ( 0, 25) June 15 19 56.72 -31 15.4 2.066 2.972 147 12.9 2:25 ( 0, 24) C/2006 S3 ( LONEOS ) It brightened up to 11-12 mag in 2012. Now it is bright as 11.0 mag (June 3, Juan Jose Gonzalez). It keeps observable in good condition until July in the Northern Hemisphere, or until September in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 13 33.84 -11 16.8 5.325 6.011 128 13.0 20:57 ( 11, 43) June 15 13 28.56 -10 54.8 5.457 6.038 120 13.1 21:02 ( 23, 41) C/2010 S1 ( LINEAR ) Now it is 13.0 mag (May 17, Chris Wyatt). It keeps bright at 13-14 mag for a long time until 2014. It keeps observable for a long time in the Northern Hemisphere. It locates somewhat low in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 21 0.78 33 13.7 5.630 5.901 100 13.3 3:00 (275, 78) June 15 20 55.18 33 16.8 5.545 5.903 105 13.3 2:58 (287, 85) C/2012 V2 ( LINEAR ) It brightened up to 14.4 mag until April (Apr. 13, Sandor Szabo). It will brighten up to 12 mag from summer to autumn. Now it is not observable. In the Southern Hemisphere, it will become observable in August, then it keeps observable while fading gradually. 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 8 5 3.08 29 22.7 2.755 1.750 6 13.6 3:00 (220,-13) June 15 5 19.72 27 19.7 2.709 1.699 5 13.5 2:58 (222,-13) 29P/Schwassmann-Wachmann 1 Now it is 12.8 mag and visible visually (June 3, Juan Jose Gonzalez). Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 13 36.41 -21 24.7 5.487 6.213 132 13.6 20:57 ( 8, 33) June 15 13 35.45 -21 9.5 5.569 6.212 125 13.7 21:02 ( 17, 32) C/2012 S1 ( ISON ) It is expected to be a great comet in 2013 autumn when the comet approaches to the sun down to only 0.01 A.U. It keeps visible with naked eyes from November to January, and can be extremely bright as Venus or more at the highlight. However, the brightening has declined at 15.5 mag from January through May in 2013. Now it is not observable. The condition is excellent in the Northern Hemisphere. It will appear in the morning sky again in late August, then it keeps observable almost all through the period of brightening, at the highlight, and of fading. The condition is not good in the Southern Hemisphere. It is not observable at all the latter part of the highlight, and it keeps low all through the period. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 7 4.72 27 56.4 4.281 3.414 27 14.0 20:57 (121, 5) June 15 7 10.60 27 37.7 4.238 3.321 22 13.8 21:02 (124, 0) C/2013 E2 ( Iwamoto ) Now it is bright as 13.1 mag (May 17, Chris Wyatt). It keeps locating in the morning sky for a long time after this. I will keep the current brightness for a long time. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 0 26.31 11 18.7 2.056 1.903 66 13.9 3:00 (275, 27) June 15 0 37.52 11 41.0 2.050 1.966 70 14.0 2:58 (277, 30) C/2011 R1 ( McNaught ) Now it is bright as 12.9 mag (May 12, Carlos Labordena). It keeps observable at 11-13 mag for a long time from 2012 summer to 2013 summer. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 13 29.18 19 19.8 2.821 3.346 112 14.0 20:57 ( 30, 72) June 15 13 24.18 20 0.3 2.989 3.403 105 14.2 21:02 ( 52, 68) C/2011 J2 ( LINEAR ) Now it is 14.5 mag (June 1, Taras Prystavski). It keeps 13 mag and observable in good condition in the Northern Hemisphere for a long time from 2013 to 2014. In the Southern Hemisphere, it is not observable until 2014 autumn. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 9 0.09 50 13.8 4.429 3.903 52 14.1 20:57 (131, 34) June 15 9 1.91 50 14.1 4.473 3.873 48 14.1 21:02 (133, 30) 117P/Helin-Roman-Alu 1 Now it is 14.0 mag (June 3, Chris Wyatt). It keeps bright as 13-14 mag for a long time from 2013 to 2014. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 14 7.29 -9 59.2 2.557 3.361 135 14.5 20:59 ( 0, 45) June 15 14 5.56 -10 9.0 2.616 3.348 128 14.5 21:02 ( 11, 44) (596) Scheila Big asteroid discovered in 1906. It suddenly showed the cometary activity on Dec. 11, 2010, probably due to an impact of a small object. It has already turned to be stellar. It locates high in the Southern Hemisphere. But it still locates very low in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 0 29.59 -12 22.7 2.963 2.888 75 14.6 3:00 (294, 12) June 15 0 36.73 -12 5.3 2.886 2.899 80 14.5 2:58 (297, 15) C/2012 K1 ( PanSTARRS ) Now it is 14.8 mag (June 4, Taras Prystavski). It is expected to brighten up to 5-6 mag in 2014 autumn. In 2013, it keeps observable in good condition until autumn when it brigthens up to 13-14 mag. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 16 38.48 21 27.0 4.790 5.557 135 14.8 23:29 ( 0, 76) June 15 16 30.87 21 39.5 4.754 5.492 132 14.8 22:54 ( 0, 77) C/2012 K6 ( McNaught ) Now it is 14.4 mag (June 3, Chris Wyatt). It reaches up to 14-15 mag from spring to summer. It is observable in excellent condition in the Southern Hemisphere. It locates low in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 13 9.20 -23 54.0 2.653 3.357 126 15.0 20:57 ( 15, 30) June 15 13 1.91 -21 2.8 2.766 3.361 117 15.1 21:02 ( 26, 30) C/2009 F4 ( McNaught ) Now it is 14.1 mag (Mar. 5, Hidetaka Sato). It will be fading slowly after this. But it keeps 15 mag in 2013. It becomes temporarily low in May, but will be observable in good condition again after June in the Southern Hemisphere. It is not observable now in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 3 50.16 -24 33.6 7.240 6.644 50 15.1 3:00 (278,-35) June 15 3 53.68 -24 12.5 7.229 6.672 53 15.1 2:58 (280,-30) C/2011 F1 ( LINEAR ) It brightened up to 9.0 mag in 2012 autumn (Nov. 4, Juan Jose Gonzalez). However, it faded out unexpectedly around the perihelion passage. Now it is fainter than originally predicted by 4-5 mag. Now it is 15.2 mag (June 3, Hidetaka Sato). In the Southern Hemisphere, it keeps observable in good condition while fading slowly after this. In the Northern Hemisphere, it will not be observable after this. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 2 27.99 -42 21.1 2.680 2.599 74 15.2 3:00 (305,-26) June 15 2 42.88 -42 27.4 2.702 2.658 76 15.3 2:58 (306,-25) C/2012 S3 ( PanSTARRS ) Now it is 16.7 mag (May 23, A. Diepvens). It is expected to brighten up to 14 mag in July and August. In the Southern Hemisphere, it keeps observable for a long time until the comet fades out. It keeps observable in good condition until September also in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 21 58.60 19 39.7 2.165 2.495 96 15.6 3:00 (294, 61) June 15 21 52.20 18 18.4 2.009 2.466 104 15.4 2:58 (307, 65) C/2009 P1 ( Garradd ) It kept as bright as 6-7 mag for a long time from 2011 summer to 2012 spring. Now it is fading. But it is bright as 15.9 mag still now (Apr. 13, Ken-ichi Kadota). Now it is not observable in the Northern Hemisphere. In July, it will be too low to observe also in the Southern Hemipshere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 8 16.52 -7 11.3 6.569 6.056 55 15.5 20:57 ( 82, -2) June 15 8 19.01 -7 18.7 6.708 6.116 50 15.6 21:02 ( 87, -8) C/2013 G6 ( Lemmon ) It brightened very rapidly. Now it is so bright as 14.7 mag (May 28, Hidetaka Sato). It keeps observable in good condition for a while in the Southern Hemipshere. It will be unobservable in late June in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 12 10.70 -18 37.0 1.527 2.125 111 15.5 20:57 ( 32, 30) June 15 11 51.67 -18 37.6 1.655 2.105 101 15.5 21:02 ( 43, 23) 63P/Wild 1 Emmanuel Jehin detected the small outburst on May 15. Now it is bright and visible visually at 12.7 mag (June 1, Carlos Labordena). Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 10 46.82 1 38.8 1.847 2.034 85 15.6 20:57 ( 65, 33) June 15 10 57.62 -0 22.0 1.933 2.054 81 15.8 21:02 ( 67, 28) C/2013 F3 ( McNaught ) Now it is 17.2 mag (Apr. 11, Hidetaka Sato). It keeps 16 mag and observable in good condition until July. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 18 26.96 17 31.8 1.424 2.258 134 15.8 1:23 ( 0, 72) June 15 18 9.24 22 23.5 1.443 2.265 133 15.8 0:38 ( 0, 77) 152P/Helin-Lawrence It brightened up to 15.5 mag in 2012 summer. Although it has already passed the perihelion, it tends to become brightest after the perihelion passage. It will be observabel at 16 mag again in 2013 summer. Now it is 18.1 mag, fainter than this ephemeris (Apr. 11, Hidetaka Sato). Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 22 34.52 -17 30.6 3.190 3.564 103 16.2 3:00 (320, 27) June 15 22 37.09 -17 40.8 3.112 3.580 109 16.1 2:58 (325, 29) P/2012 B1 ( PanSTARRS ) Now it is very bright and visible visually as 13.7 mag (June 3, Juan Jose Gonzalez). It will be observable at 14-16 mag for a long time from 2013 to 2014. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 11 52.06 4 38.3 3.540 3.834 99 16.3 20:57 ( 53, 47) June 15 11 54.96 4 4.2 3.636 3.831 93 16.3 21:02 ( 60, 41) P/2012 F2 ( PanSTARRS ) Now it is 17.5 mag (Mar. 16, Hidetaka Sato). It keeps observable in good condition at 17 mag from spring to summer. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 18 48.83 -6 57.4 2.005 2.930 150 16.3 1:44 ( 0, 48) June 15 18 45.62 -6 20.9 1.982 2.938 155 16.3 1:14 ( 0, 49) C/2012 V1 ( PanSTARRS ) It is expected to brighten rapidly and to be observable at 15 mag in good condition from July to August. But actually, it is not detected, fainter than 20 mag (May 19, Hidetaka Sato). It can have been already disintegrated. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 23 58.57 21 59.4 2.282 2.153 69 16.6 3:00 (268, 38) June 15 23 50.44 22 27.5 2.108 2.135 77 16.4 2:58 (272, 45) C/2013 G5 ( Catalina ) It will approach to the Sun down to 0.9 A.U., and to the Earth down to 0.4 A.U. in September. Then it is expected to brighten up to 11-12 mag. Now it is 17.2 mag (May 29, Taras Prystavski). It looks diffuse. In the Northern Hemisphere, it keeps observable in good condition until mid September while brightening rapidly. In the Southern Hemisphre, it keeps locating low for a while. However, it will getting higher after August, and it keeps observable in good condition after that, until the comet fades out. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 13 37.82 52 24.3 1.324 1.702 92 16.9 20:57 (166, 72) June 15 13 32.84 51 41.2 1.282 1.614 88 16.6 21:02 (150, 70) C/2011 O1 ( LINEAR ) Now it is 16.1 mag (Mar. 4, Hidetaka Sato). In the Southern Hemisphere, it will be observable at 15-16 mag in good condition for a long time until summer. It is not observable at all in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 4 36.23 -42 59.9 4.949 4.633 66 16.6 3:00 (298,-49) June 15 4 44.91 -42 24.2 4.973 4.664 66 16.7 2:58 (297,-46) 257P/2012 F4 ( Catalina ) Now it is 17.2 mag (May 15, W. Hasubick). It is expected to be observable at 16 mag in good condition in summer and autumn. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 23 23.13 15 51.6 2.062 2.129 79 16.8 3:00 (280, 42) June 15 23 33.70 17 7.9 1.996 2.131 83 16.8 2:58 (282, 46) 184P/Lovas 2 It was predicted to be 17 mag in late May. But actually, it was much fainter, 19-20 mag (May 26, Damian Peach). It was expected to be bright as 16 mag and observable in good condition from summer to autumn. But it can be 18-19 mag at best. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 23 59.99 1 14.1 1.368 1.504 76 17.0 3:00 (288, 26) June 15 0 21.08 3 39.3 1.312 1.477 77 16.8 2:58 (287, 29) 26P/Grigg-Skjellerup It tends to brighten very rapidly near the perihelion. It was so faint as 17.8 mag on May 25, but it brightened rapidly up to 15.5 mag on June 8 (Hidetaka Sato). It is expected to reach up to 12 mag in the evening sky from July to August. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 9 0.75 7 20.2 1.277 1.147 58 17.7 20:57 ( 88, 16) June 15 9 26.81 7 43.3 1.257 1.121 57 16.8 21:02 ( 89, 15) P/2005 L1 ( McNaught ) First return of a new periodic comet discovered in 2005. It will be observable at 17 mag for a long time from 2013 to 2014. However, it has not been recovered yet. Not it is fainter than 19.5 mag (Feb. 21, Martin Masek). Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 17 1.93 -12 46.8 2.240 3.245 169 17.0 23:53 ( 0, 42) June 15 16 57.08 -12 48.1 2.242 3.238 166 17.0 23:21 ( 0, 42) C/2013 J2 ( McNaught ) Now it is 17.6 mag (May 9, Siding Spring Survey). It is observable at 16.5 mag in good condition from July to September. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 21 30.51 -11 35.2 1.813 2.434 115 17.2 3:00 (333, 39) June 15 21 34.99 -10 6.2 1.734 2.420 121 17.0 2:58 (338, 42) 154P/Brewington Not observed yet in this apparition. It will brighten very rapidly near the perihelion passage. It is expected to reach up to 10 mag from autumn to winter. In the Northern Hemipshere, it keeps observable in excellent condition until the comet fades out. In the Southern Hemisphere, it keeps observable in good condition within 2013, but it will not be observable in 2014. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 22 39.83 -21 44.1 2.071 2.511 103 17.5 3:00 (321, 22) June 15 22 46.02 -21 5.5 1.943 2.463 108 17.2 2:58 (325, 25) C/2012 C1 ( McNaught ) Now it is 17.0 mag (Mar. 4, Hidetaka Sato). It keeps 17 mag for a long time from 2012 to 2013, and will be observable in good condition in the Southern Hemisphere. It is not observable at all in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 2 17.90 -63 50.3 4.782 4.933 92 17.3 3:00 (328,-32) June 15 2 18.53 -64 51.2 4.737 4.944 95 17.3 2:58 (331,-30) C/2013 G2 ( McNaught ) Now it is 16.9 mag (May 19, Hidetaka Sato). It will be fading after this. It locates low in the Northern Hempshere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 18 56.63 -25 49.5 2.049 2.996 154 17.3 1:53 ( 0, 29) June 15 18 40.37 -23 51.4 2.057 3.048 164 17.4 1:09 ( 0, 31) P/1998 Y2 ( Li ) First return of a new periodic comet discovered in 1998. It is expected to be observable at 15.5 mag in good condition from 2013 autumn to early 2014. It locates high in the Southern Hemisphere. But it has not been recovered yet. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 0 56.60 -18 26.2 3.314 3.173 73 17.6 3:00 (295, 3) June 15 1 5.66 -18 15.0 3.203 3.142 77 17.5 2:58 (297, 6) 174P/(60558) 2000 EC98 ( Echeclus ) It has brightened in outburst up to 14 mag twice, in 2006 January and 2011 May. It will pass the perihelion in 2015. It keeps observable at 17 mag for a long time after this. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 19 15.24 -17 33.8 5.752 6.642 148 17.8 2:11 ( 0, 37) June 15 19 13.08 -17 36.0 5.686 6.627 155 17.7 1:41 ( 0, 37) C/2013 G7 ( McNaught ) Now it is 17.3 mag (Apr. 16, Siding Spring Survey). It keeps 17-18 mag for a long time from 2013 to 2014. It keeps observable in good condition in the Southern Hemisphere. In the Northern Hemisphere, it is only observable until 2012 July. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 14 32.86 -17 14.8 4.326 5.183 144 17.8 21:24 ( 0, 38) June 15 14 25.81 -17 35.5 4.382 5.160 135 17.8 21:02 ( 4, 37) C/2013 J3 ( McNaught ) Now it is 17.2 mag (May 10, Siding Spring Survey). Now it is brightest, and will be fading after this. It locates low in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 12 30.46 -26 52.2 3.504 4.087 118 17.8 20:57 ( 23, 24) June 15 12 28.29 -24 38.5 3.621 4.100 111 17.9 21:02 ( 32, 23) P/2013 G1 ( Kowalski ) Now it is 18.2 mag (Apr. 16, Hidetaka Sato). It keeps 18 mag for a long time from 2013 to 2014. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 15 12.69 -15 46.9 2.641 3.574 152 17.8 22:04 ( 0, 39) June 15 15 10.27 -15 30.1 2.675 3.559 145 17.8 21:35 ( 0, 39) C/2008 S3 ( Boattini ) It has been observed at 17 mag for a long time from 2009 to 2012. It is also observable at 18 mag in good condition in 2013. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 22 23.34 8 38.8 8.978 9.139 95 17.9 3:00 (301, 49) June 15 22 21.17 8 42.1 8.880 9.159 102 17.9 2:58 (310, 54) C/2011 KP36 ( Spacewatch ) It is expected to brighten up to 14 mag from 2015 to 2016. Now it is 18.4 mag (Apr. 8, Hidetaka Sato). Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 17 54.08 -2 6.9 7.833 8.770 156 17.9 0:50 ( 0, 53) June 15 17 51.87 -2 3.7 7.784 8.736 158 17.9 0:20 ( 0, 53) C/2013 H2 ( Boattini ) It keeps observable at 18 mag for a long time from 2013 to 2014. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 16 37.98 -3 30.8 6.673 7.633 159 17.9 23:29 ( 0, 52) June 15 16 32.89 -2 59.2 6.692 7.625 154 18.0 22:57 ( 0, 52) 17P/Holmes It brightened up to 2 mag by unusual major outburst in 2007. It was observed around aphelion at 22 mag. It will return in 2014. It will be 14 mag at best by normal prediction. Now it is 17.0 mag, a bit brighter than this ephemeris (May 5, iTelescope Observatory). Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 17 38.23 -49 14.1 1.999 2.938 152 18.2 0:34 ( 0, 6) June 15 17 29.87 -49 6.5 1.959 2.908 154 18.1 23:53 ( 0, 6) 91P/Russell 3 It was predicted to be 17 mag. But actually, it is much fainter, 19.0 mag (June 3, Hidetaka Sato). Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 18 18.58 -15 34.5 1.704 2.684 161 18.4 1:14 ( 0, 39) June 15 18 13.63 -14 53.2 1.693 2.694 167 18.4 0:42 ( 0, 40) 98P/Takamizawa It was predicted to be already 15-16 mag. But actually, it is 18.1 mag, much fainter than predicted by 3-4 mag (May 5, Catalina Sky Survey). It was expected to brighten up to 14 mag and to be observable in excellent condition in summer. However, it can be fainter than 18 mag. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 8 14 56.66 1 37.9 0.865 1.770 140 18.6 21:48 ( 0, 56) June 15 14 55.85 0 21.0 0.876 1.749 135 18.6 21:20 ( 0, 55)