Weekly Information about Bright Comets (2007 Jan. 13: North)

Japanese version Home page	Updated on January 17, 2007
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Best time and the azimuth, altitude (A,h) are at lat. 35 deg in the Northern Hemisphere.

C/2006 P1 ( McNaught ) It has become a great comet, much brighter than originally expected. It has been brighter than 0 mag for one week since Jan. 6, shining in the twilight in the evening very low sky. It passed only 0.17 A.U. from the sun at the perihelion on Jan. 12, then it reached up to -5 or -6 mag on Jan. 14! It became brighter than Venus, and it was visible in daytime easily with binoculars. Around the same time, the comet entered in the field of view of SOHO or STEREO images, which show an incredible great comet with a very long bright tail. Because the comet is moving southwards, it will be unobservable in the Northern Hemisphere soon. People in the Southern Hemisphere will see a fantastic view in the evening sky. Then it keeps observable while fading gradually in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 13 19 55.69 -16 49.1 0.849 0.171 6 -3.3 18:38 ( 76,-12) Jan. 20 20 34.69 -38 17.5 0.875 0.326 19 0.2 18:44 ( 57,-22) 4P/Faye It reached up to 9.3 mag between October and November (Oct. 27, Juan Jose Gonzalez). It had been observable in excellent condition. But it is fading now. It has already faded down to 11.8 mag (Jan. 11, Carlos Labordena). However, it keeps observable after this until May when it fades down to 16 mag. It will be visible visually for a long time until around March. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 13 3 4.14 5 3.1 1.141 1.766 112 11.2 19:35 ( 0, 60) Jan. 20 3 15.39 6 2.3 1.218 1.790 108 11.4 19:18 ( 0, 61) C/2006 M4 ( SWAN ) After it kept 5.5-6.0 mag from early October to mid October, it suddenly brightened in outburst on Oct. 24, and reached up to 4.2 mag on Oct. 25 (Maik Meyer). It became easily visible with naked eyes, and a very long tail of 5 degrees was visible with binoculars. But now it is fading, and it has already faded down to 10.5 mag (Jan. 11, Carlos Labordena). It will be too low in the evening sky to observe soon. It will appear in the morning sky again at 15-16 mag in May. Then 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) Jan. 13 21 18.88 -5 1.9 2.771 1.979 29 11.8 18:38 ( 75, 12) Jan. 20 21 28.79 -5 44.2 2.926 2.073 24 12.2 18:44 ( 78, 6) C/2006 L1 ( Garradd ) When it approached to the earth between from November to early December, it reached up to 8.5 mag as a very large diffuse object with a diameter larger than 10 arcmin (Nov. 23, Peter Bus). It kept 9 mag and observable in excellent condition for a long time since mid October until mid December. However, now it is fading, down to 11.5 mag (Jan. 11, Carlos Labordena). It will fade out rapidly after January. It will be fainter than 14 mag, too faint to see visually, in February. It will set down in the evening sky at 17 mag in March. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 13 1 44.53 41 39.7 1.376 1.895 105 11.9 18:38 (146, 82) Jan. 20 1 31.18 39 16.2 1.586 1.955 96 12.6 18:44 (112, 75) C/2006 L2 ( McNaught ) It was too low in the evening to observe in October and November. But it is getting higher in the morning sky again. Now it is 12.2 mag (Dec. 28, Juan Jose Gonzalez). It keeps 12-13 mag until March and visible visually for a long time. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 13 17 29.18 34 42.4 2.336 2.098 63 12.6 5:38 (250, 37) Jan. 20 17 46.76 38 44.8 2.299 2.126 67 12.6 5:37 (246, 40) 29P/Schwassmann-Wachmann 1 In this season, it has been bright as 12-13 mag and visible visually since it appeared in the morning sky in early July. Now it is 13.1 mag (Dec. 22, Seiichi Yoshida). Diffuse, and not easy to see visually. However, it looks very large on CCD images, with a diameter of about 2 arcmin. It keeps observable in good condition until March. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 13 3 44.17 29 35.3 5.222 5.874 127 13.4 20:14 ( 0, 85) Jan. 20 3 43.42 29 20.3 5.316 5.876 120 13.4 19:46 ( 0, 84) C/2005 YW ( LINEAR ) It had been unobservble for a long time. When it appeared again in the morning sky, it has showed a cometary activity and it has become much brighter than expected. It was visible visually on Oct. 31 at 13.7 mag (Seiichi Yoshida). It is bright as 13.8 mag still now (Dec. 29, Katsumi Yoshimoto). It keeps 13-14 mag until March. It is observable in good condition in the Southern Hemisphere. However, it will not be observable in the Northern Hemisphere soon. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 13 13 41.14 -50 33.2 2.103 2.040 72 13.6 5:38 (355, 4) Jan. 20 13 58.53 -53 38.0 2.084 2.060 74 13.7 5:37 (356, 1) P/2006 HR30 ( Siding Spring ) Now it is 14.6 mag (Dec. 23, Seiichi Yoshida). Almost asteroidal. It did not brighten at all since early September. Although the slight cometary activity was detected in late July, it became completely stellar soon. Its tail became visible again in late October, however, it turned to be stellar again soon. Finally it has passed the perihelion, keeping almost asteroidal. In the Northern Hemisphere, it keeps good condition after this. It keeps locating high until spring. It is fainter than this ephemeris recently. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 13 23 52.17 46 45.6 0.760 1.236 89 13.7 18:38 (126, 62) Jan. 20 0 41.32 47 27.1 0.750 1.252 91 13.7 18:44 (129, 65) C/2003 WT42 ( LINEAR ) It has been visible at 13.5 mag for a long time since 2005 autumn until 2006 spring. Now it is fainter than last year by 1 mag, however, it is still visible visually at 14.2 mag (Dec. 22, Seiichi Yoshida). It keeps observable in excellent condition until April. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 13 13 11.58 22 12.2 5.282 5.593 103 14.4 5:38 (355, 77) Jan. 20 13 12.99 22 21.4 5.208 5.612 109 14.4 5:17 ( 0, 77) C/2006 K3 ( McNaught ) It is observable in good condition in the Southern Hemisphere. But it is not observable until January in the Northern Hemisphere. It was discovered at 17.5 mag in May. Then it has not been brightening well. It is 16.5-17 mag still in December. It will be observable also in the Northern Hemisphere in the evening low sky from January to March, however, it will be fainter than 15 mag. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 13 2 41.81 -44 52.6 2.462 2.583 85 15.1 19:11 ( 0, 10) Jan. 20 2 35.27 -40 23.2 2.505 2.565 82 15.1 18:44 ( 1, 15) 185P/2007 A3 ( Petriew ) First return of a new bright periodic comet observed at 9 mag in 2001. Filip Fratev caught it on Jan. 11 at 16.1 mag. It is fainter than expected by 2.5 mag. The condition of this apparition is bad. It keeps locating very low in the evening. Although it was expected to reach up to 11 mag in February and March, it will be 14 mag at best in fact. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 13 21 19.83 -8 50.9 1.892 1.122 27 15.6 18:38 ( 72, 10) Jan. 20 21 46.06 -7 31.7 1.847 1.072 27 15.1 18:44 ( 74, 9) C/2005 EL173 ( LONEOS ) Now it is 15.5 mag (Dec. 3, Ken-ichi Kadota). It is observable at 15.5-16 mag until spring. But, in the Northern Hemisphere, it locates somewhat low at 20-30 degree high. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 13 6 12.74 -34 45.8 3.324 3.913 120 15.5 22:40 ( 0, 20) Jan. 20 5 56.45 -34 18.4 3.356 3.906 117 15.5 21:57 ( 0, 21) C/2006 XA1 ( LINEAR ) New comet. Now it is 15.9 mag (Jan. 10, Ken-ichi Kadota). It keeps observable at 15 mag in the evening sky until May. It is not observable around the perihelion passage in conjunction with the sun. Then it moves to the southern sky, and it will be unobservable in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 13 2 27.84 52 50.9 2.368 2.919 114 16.0 18:58 (180, 72) Jan. 20 2 31.36 51 33.1 2.374 2.858 109 15.9 18:44 (175, 73) 84P/Giclas It tends to become brightest about 4 months after the perihelion passage. In this apparition, it was 17.6 mag in late July around the perihelion passage (July 23, Filip Fratev), however, it brightened up to 14.1 mag and became visible visually on Dec. 23 (Seiichi Yoshida). But it will start fading after this. Although it keeps a good condition for a long time, it will be fainter than 18 mag in March. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 13 5 23.39 19 22.3 1.391 2.290 148 16.1 21:53 ( 0, 74) Jan. 20 5 21.66 19 54.8 1.471 2.323 141 16.2 21:23 ( 0, 75) C/2005 E2 ( McNaught ) It was still visible visually at 14.2 mag on Oct. 31 (Seiichi Yoshida). However, it has already faded down to 15.8 mag (Dec. 15, Ernesto Guido and Giovanni Sostero). It keeps a good contition until spring, while the comet will be fading gradually. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 13 9 52.80 25 34.1 3.317 4.188 148 16.1 2:26 ( 0, 81) Jan. 20 9 47.68 25 53.5 3.336 4.254 156 16.2 1:53 ( 0, 81) 76P/West-Kohoutek-Ikemura It was expected to reach to 13 mag in winter. But actually, it was 15.7 mag at best (Dec. 5, Ken-ichi Kadota), much fainter than expected. It will fade out rapidly after this. It will be fainter than 18 mag in February. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 13 8 10.62 55 48.6 0.787 1.691 145 16.2 0:44 (180, 69) Jan. 20 8 4.37 58 37.8 0.829 1.713 141 16.4 0:10 (180, 67) 2P/Encke It will reach to 6 mag at the perihelion passage in mid April. It is observale while brightening gradually in the evening sky in the Northern Hemisphere. However, it will locate very low when it becomes bright enough to see visually. It will be 14 mag in mid February, when the altitude becomes lower than 20 degree. It will be 11.5 mag in mid March, when the altitude becomes lower than 10 degree. After conjunction with the sun, it appears in the morning sky at 12 mag in June. But it locates only 20 degree high at most, and it will be fading rapidly. In the Southern Hemisphere, it appears in the morning sky at 8 mag in May, then it will be bright and observable for a while. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 13 23 18.39 3 35.1 2.031 1.757 59 17.5 18:38 ( 61, 40) Jan. 20 23 26.19 4 15.3 2.032 1.671 54 16.9 18:44 ( 67, 36) C/2006 V1 ( Catalina ) It will be brightening gradually at the high altitude until 2007 spring, while it brightens up to 16 mag. Then it keeps 15.5-16 mag for one year and a half until 2008 summer. However, because the comet moves southwards, it is only observable until 2007 June in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 13 11 11.79 5 8.5 3.497 4.145 125 17.1 3:44 ( 0, 60) Jan. 20 11 10.20 4 40.1 3.364 4.096 132 17.0 3:15 ( 0, 60) C/2002 VQ94 ( LINEAR ) Now it is 16.8 mag (Dec. 29, Katsumi Yoshimoto). 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) Jan. 13 14 48.40 37 45.7 7.077 7.143 89 17.1 5:38 (255, 69) Jan. 20 14 49.63 37 58.6 7.016 7.157 94 17.1 5:37 (254, 74) 173P/2005 T1 ( Mueller 5 ) Now it is 17.0 mag (Dec. 17, Ken-ichi Kadota). The perihelion passage is in 2008. It will be observable for several years after this at around 17 mag. But it may fade out rapidly just after the perihelion passage. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 13 4 14.10 11 50.5 3.975 4.678 130 17.2 20:44 ( 0, 67) Jan. 20 4 12.64 12 11.3 4.049 4.666 123 17.2 20:15 ( 0, 67) C/2004 D1 ( NEAT ) It reached to 16 mag in early 2006. Now it is 17.3 mag (Dec. 2, Ken-ichi Kadota). It will be fading very slowly from 17 mag to 18 mag until 2007 summer. In the Northern Hemisphere, it keeps locating high. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 13 14 17.46 31 1.4 5.464 5.598 92 17.2 5:38 (280, 75) Jan. 20 14 20.12 31 16.3 5.407 5.622 97 17.2 5:37 (288, 79) 112P/Urata-Niijima Although it was so faint as 20.7 mag on Aug. 2 (P. Birtwhistle), it brightened rapidly as expected, and reached up to 15.7 mag on Nov. 15 (Ken-ichi Kadota). After it passed the perihelion, it has not started fading yet. It is bright as 16.1 mag still now (Dec. 19, Ken-ichi Kadota). In the Northern Hemisphere, it keeps a good condition for a long time after this. It will be observable at 16-17 mag for a while. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 13 4 40.84 68 43.0 0.892 1.671 125 17.2 21:11 (180, 56) Jan. 20 4 49.99 67 35.0 0.952 1.706 123 17.5 20:53 (180, 57) C/2004 L2 ( LINEAR ) It reached up to 16 mag in 2005 summer in the Southern Hemisphere. Now it is 17.2 mag (Dec. 4, Ken-ichi Kadota). The brightening was very slow, and the fading seems also very slow. It will keep 17 mag until January after this. But then it will turn to fade out rapidly, and will be fainter than 18 mag in February. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 13 4 55.53 -16 58.8 4.609 5.234 124 17.3 21:25 ( 0, 38) Jan. 20 4 52.68 -15 45.3 4.707 5.273 120 17.4 20:54 ( 0, 39) P/2005 SB216 ( LONEOS ) It keeps 17 mag until January. Then it keeps observable util April when it becomes fainter than 18 mag. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 13 3 58.22 50 29.0 3.128 3.822 128 17.3 20:28 (180, 75) Jan. 20 3 57.80 49 54.3 3.192 3.821 123 17.3 20:00 (180, 75) 184P/2007 A1 ( Lovas 2 ) It had been lost since its discovery in 1986. But it was rediscovered on Jan. 9 at 16-17 mag. The condition is good in this return, and it was expected to reach to 14 mag from autumn to winter. But actually, it is fainter than originally expected, and it seems to have reached to 17 mag at best. It will be fainter than 18 mag in February. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 13 23 5.77 -4 28.3 1.789 1.440 53 17.3 18:38 ( 57, 32) Jan. 20 23 27.91 -2 10.1 1.837 1.461 52 17.5 18:44 ( 61, 32) P/2006 U5 ( Christensen ) It is observable in excellent condition at 17.5 mag in December and January. It will be fainer than 18 mag in March. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 13 6 17.83 29 9.1 1.375 2.326 160 17.4 22:47 ( 0, 84) Jan. 20 6 13.46 29 1.2 1.406 2.326 152 17.4 22:15 ( 0, 84) 2006 SV301 Peculiar asteroid moving along an orbit like a comet. It reaches up to 17.5 mag in mid January. But it will be fainter than 18 mag in February. It is observable in an excellent condition in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 13 7 28.92 22 45.5 1.670 2.653 177 17.5 0:02 ( 0, 78) Jan. 20 7 24.17 23 12.1 1.667 2.641 169 17.7 23:25 ( 0, 78) 182P/2006 W2 ( LONEOS ) Recovered at 19.3 mag on Nov. 18 (E. J. Christensen). It is a tiny comet, however, it will pass near, only 0.3 A.U., by the earth in February and will be 17 mag. It moves northern sky and it is observable in good condition in the Northern Hemisphere. However, it will be fade out soon, will be fainter than 18 mag in March. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 13 0 51.97 26 52.5 0.322 1.037 90 17.7 18:38 ( 70, 72) Jan. 20 0 43.06 34 41.8 0.312 1.009 85 17.5 18:44 ( 99, 66) C/2004 B1 ( LINEAR ) It was visible visually at 12 mag in last spring. Now it is 17.2 mag (Dec. 29, Katsumi Yoshimoto), brighter than this ephemeris. It will keep good condition for a while after this, but it will be fading gradually. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 13 16 43.25 33 56.3 4.566 4.315 69 17.7 5:38 (255, 46) Jan. 20 16 46.84 35 24.9 4.565 4.380 73 17.7 5:37 (255, 51) 65P/Gunn Now it is around the aphelion and faintest, but it is observed at 18 mag. It will be observable at 18 mag in good condition until March. It will be 13-14 mag and visible visually again in 2009. It will reach to 12.5 mag in 2010. But in the Northern Hemisphere, it will locate very low in the south at that time. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 13 5 47.14 28 39.6 3.811 4.717 154 17.8 22:16 ( 0, 84) Jan. 20 5 42.88 28 40.5 3.862 4.714 146 17.8 21:44 ( 0, 84) C/2006 S5 ( Hill ) It will reach up to 14 mag one year later, in next winter, when it will be observable in excellent condition in the Northern Hemisphere. Now it is only 18 mag. It will be lower in February, then it will be unobservable for a while until July. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 13 0 36.94 14 31.1 4.229 4.207 82 17.9 18:38 ( 51, 61) Jan. 20 0 41.26 14 39.7 4.284 4.157 76 17.8 18:44 ( 61, 56) 181P/2006 U4 ( Shoemaker-Levy 6 ) Recovered after 15 year blank. The condition is good in this return. It was expected to reach to 13.5 mag in November. But actually, it was 15.0 mag at best (Dec. 2, Ken-ichi Kadota), fainter than expected. Now it is fading rapidly. It has already faded down to 17.1 mag (Dec. 29, Ken-ichi Kadota). Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 13 0 26.40 10 48.2 1.082 1.304 78 17.8 18:38 ( 50, 57) Jan. 20 0 50.83 15 3.5 1.147 1.351 78 18.5 18:44 ( 58, 59) 52P/Harrington-Abell It was in major outburst unexpectedly and reached to 10.5 mag in its last appearance in 1999. However, it is faint in this apparition. Now it is 17.4 mag (Nov. 23, Ken-ichi Kadota). It will fade out gradually after this. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 13 13 40.39 -15 28.1 2.123 2.236 83 18.1 5:38 (349, 39) Jan. 20 13 47.12 -16 42.8 2.073 2.273 88 18.2 5:37 (356, 38)