Weekly Information about Bright Comets (2006 Sept. 30: North)

Japanese version Home page	Updated on October 2, 2006
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Best time and the azimuth, altitude (A,h) are at lat. 35 deg in the Northern Hemisphere.

C/2006 M4 ( SWAN ) Now it appears in the morning sky. It is 6.3 mag, brighter than expected (Sept. 27, Seiichi Yoshida). Very strongly condensed and easy to see. It will keep 6-7 mag until the end of October. In the Northern Hemisphere, it located low in the morning sky in September. But it turns to locate in the evening sky after early October, then it keeps observable in the evening sky until early January while fading gradually. In the Southern Hemisphere, it cannot be observable until next April when it becomes fainter than 15 mag. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.30 12 0.83 32 11.9 1.346 0.783 35 6.6 4:29 (236, 8) Oct. 7 12 48.05 35 59.5 1.202 0.799 41 6.4 4:35 (231, 8) 4P/Faye Now it is 10.6 mag (Sept. 26, Juan Jose Gonzalez). It is somewhat fainter than this ephemeris, however, it is well condensed and easy to see. The long dust tail is clearly visible. It will reach to 9 mag until winter, and observable in its best condition. It keeps 14 mag still in 2007 March, so it keeps visible visually for a long time. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.30 2 5.01 13 1.7 0.777 1.731 153 9.8 1:32 ( 0, 68) Oct. 7 2 7.36 11 47.8 0.740 1.713 159 9.6 1:06 ( 0, 67) 177P/2006 M3 ( Barnard 2 ) Recovered after 117 year blank since 1889. It brightened rapidly in mid July and reached to 8 mag. Then it kept bright at 8 mag with a large diffuse coma until early September. But it has already started fading. Now it is 9.7 mag (Sept. 25, Jakub Cerny). It will fade out rapidly after this. Because it is very diffuse, it can be invisible soon. In the Northern Hemisphere, it keeps locating very high in the evening sky for a long time after this. It moves around the Northern Pole, so it will be observable all night until November, although it becomes low in the morning. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.30 18 41.40 71 14.4 0.632 1.220 93 10.4 19:10 (172, 53) Oct. 7 19 32.65 72 52.8 0.651 1.269 98 11.0 19:00 (177, 52) C/2006 L2 ( McNaught ) It is bright as 12.6 mag and visible visually (June 21, Juan Jose Gonzalez). It becomes too low in the evening to observe in October. But it will be getting higher in the morning sky after December. It keeps 13 mag until 2007 March, so it will be visible visually for a long time. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.30 14 45.92 1 37.7 2.819 2.089 35 12.9 19:10 ( 83, 13) Oct. 7 14 53.15 2 57.0 2.845 2.065 31 12.9 19:00 ( 85, 12) 29P/Schwassmann-Wachmann 1 A small outburst occured in late August, and it was visible visually, bright and strongly condensed, in early September. It is visible at 13.4 mag still now (Sept. 27, Seiichi Yoshida). Since it appeared in the morning sky in early July, it has been bright as 13 mag and visible visually. It is observable in good condition until winter. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.30 4 24.92 31 35.3 5.326 5.843 116 13.4 3:51 ( 0, 87) Oct. 7 4 24.13 31 42.7 5.234 5.845 123 13.3 3:23 ( 0, 87) 71P/Clark It reached up to 10.3 mag on July 7 (Juan Jose Gonzalez). Then it is fading gradually. Now it is 12.6 mag (Sept. 27, Seiichi Yoshida). In the Northern Hemisphere, it will get higher gradually after this. However, it will be too faint to see visually soon. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.30 20 30.05 -33 51.6 1.256 1.899 114 13.8 19:54 ( 0, 21) Oct. 7 20 40.54 -32 27.3 1.349 1.934 109 14.1 19:37 ( 0, 23) C/2006 P1 ( McNaught ) It will pass only 0.17 A.U. from the sun in 2007 January. Althohgh it was reported as 17 mag at the discovery, it is actually much brighter. Now it is 12.5-13 mag (Sept. 23, Michael Jager and Gerald Rhemann), with a very large diffuse coma of 2-2.5 arcmin. The comet will be brightening gradually after this, but it keeps locating low in the evening in the Northern Hemisphere. It will be observable only until early November when it becomes 12 mag. It is expected to reach up to 4.5 mag in January, but it is not observable at that time. After the perihelion passage, it is only observable in the Southern Hemisphere. In the Southern Hemisphere, it will appear at 8 mag in late January, then it keeps observable while fading gradually. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.30 16 23.47 -14 55.7 2.614 2.288 60 14.2 19:10 ( 53, 21) Oct. 7 16 26.48 -14 41.2 2.609 2.178 54 14.0 19:00 ( 56, 19) D/1986 W1 ( Lovas 2 ) It has been lost since its discovery in 1986. The condition is good in this return. In calculation, it was expected to be 14 mag from autumn to winter. But actually, it must be much fainter than expected. Although it has been listed up as an observable target since May, it has not been recovered yet. It was probably in outburst and brightened unexpectedly at the discovery. In the Northern Hemisphere, it keeps observable until it fades out in next spring. When it becomes brightest in October and November, it will move away from the Milky Way. So it will be easier to recover. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.30 18 24.64 -22 5.4 1.170 1.528 89 14.1 19:10 ( 22, 30) Oct. 7 18 40.85 -21 48.1 1.190 1.499 85 14.0 19:00 ( 22, 30) C/2005 E2 ( McNaught ) It had been observed at 10 mag in the evening sky from winter to spring. Although it has been unobservable since May, now it is appearing in the morning sky again. Now it is 14.0 mag (Sept. 25, Jakub Cerny), still visible visually. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.30 9 27.68 26 13.4 3.695 3.169 51 14.2 4:29 (259, 33) Oct. 7 9 35.26 25 42.7 3.682 3.238 56 14.3 4:35 (263, 38) P/2006 HR30 ( Siding Spring ) Now it is 14.3 mag and almost asteroidal (Sept. 20, Edwin van Dijk). Although the slight cometary activity was detected in late July, its faint tail became too hard to detect now. In the Northern Hemisphere, it keeps good condition after this. It keeps locating high until next spring. If it keeps asteroidal after this, it will be 13.7 mag at best. However, it may suddenly become active and brighten rapidly someday. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.30 21 6.07 29 0.7 0.991 1.776 126 14.3 20:29 ( 0, 84) Oct. 7 20 55.36 29 42.7 0.980 1.713 119 14.3 19:51 ( 0, 85) C/2003 WT42 ( LINEAR ) It has been visible at 13.5 mag for a long time since last autumn until spring. Now it is not observable. However, it will be observable in good condition again at 14.5 mag in winter. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.30 11 58.32 27 11.4 6.190 5.351 30 14.4 4:29 (240, 5) Oct. 7 12 5.07 26 27.9 6.168 5.364 33 14.4 4:35 (244, 9) P/1991 V1 ( Shoemaker-Levy 6 ) It was missed in 1999 due to the bad condition. The condition is good in this return. It will reach to 13.5 mag in November. Although it is too low in the Northern Hemisphere now, it locates high in the Southern Hemisphere. It must be already bright as 15 mag, but it has not been recovered yet. In the Northern Hemisphere, it will be getting higher gradually after mid October. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.30 18 11.04 -47 5.0 0.902 1.298 85 15.0 19:10 ( 16, 5) Oct. 7 18 33.23 -45 40.8 0.885 1.255 83 14.7 19:00 ( 15, 7) 117P/Helin-Roman-Alu 1 It is bright as 13.2 mag and visible visually (Sept. 27, Seiichi Yoshida). It keeps locating at the same altitude until December. But it will be too faint to see visually in October. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.30 22 9.17 -23 37.0 2.520 3.332 137 15.0 21:32 ( 0, 31) Oct. 7 22 7.43 -23 23.2 2.602 3.345 131 15.1 21:03 ( 0, 32) (3200) Phaethon It is observable in good condition at 15 mag in September and October. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.30 3 30.65 76 21.9 0.515 1.217 101 15.3 3:04 (180, 49) Oct. 7 1 8.89 71 16.4 0.537 1.313 113 15.2 0:13 (180, 53) 52P/Harrington-Abell It was in major outburst unexpectedly and reached to 10.5 mag in its last appearance in 1999. It was already recovered in 2005 October. But it has not been observed for 1 year since that. So the current brightness is quite uncertain. It has already appeared in the morning sky. It is expected to be 15.5 mag, but actually, it can be much fainter than this ephemeris. It will fade out gradually after this. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.30 10 35.99 11 4.4 2.605 1.811 30 15.5 4:29 (265, 12) Oct. 7 10 51.97 9 3.9 2.588 1.828 32 15.6 4:35 (269, 14) 73P-C/Schwassmann-Wachmann 3 It reached to 6 mag at best in early May at the remarkable approach to the earth, when it became double naked eye comets with the component B around the zenith. Now it is going away from the earth and fading. It has already faded down to 13.9 mag (Sept. 27, Seiichi Yoshida). It will be too faint to see visually soon. The component B has faded out rapidly since June, and already so faint, fainter than 17 mag. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.30 1 12.13 -16 49.5 0.812 1.778 157 15.5 0:40 ( 0, 38) Oct. 7 1 0.26 -16 24.4 0.878 1.844 158 16.0 0:00 ( 0, 39) C/2006 L1 ( Garradd ) Appearing at dawn. Although it has not been observed since June, it must be already bright as 15.5 mag. It will reach to 14 mag in November and December, when it will be observable in excellent condition and visible visually. Then it keeps observable until February when it becomes fainter than 18 mag in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.30 10 4.85 -2 48.8 2.196 1.488 34 15.7 4:29 (281, 10) Oct. 7 10 5.09 -1 28.6 2.071 1.475 41 15.6 4:35 (285, 18) 114P/Wiseman-Skiff Now it is 16.5 mag (Sept. 2, Ken-ichi Kadota). It keeps 16 mag until December. It keeps observable until February when it becomes fainter than 18 mag. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.30 8 37.07 17 38.5 1.840 1.587 59 15.7 4:29 (276, 40) Oct. 7 8 54.35 15 15.9 1.803 1.596 61 15.6 4:35 (281, 42) C/2005 L3 ( McNaught ) It is outside of Jupiter's orbit, so it keeps observable for a long time. Now it is 15.8 mag (June 2, Ernesto Guido and Giovanni Sostero). In 2006, it is still faint and locating somewhat low. But in 2007 and 2008, it is expected to be bright as 14.5-15 mag. It will locate high at that time, so it may be visible visually. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.30 18 35.09 -21 38.6 6.437 6.541 91 15.8 19:10 ( 19, 31) Oct. 7 18 33.34 -21 20.8 6.540 6.516 84 15.8 19:00 ( 24, 30) 84P/Giclas It becomes brightest about 4 months after the perihelion passage. It brightened up to 16.7 mag in mid September. It will reach to 15.5 mag and will be observable in good condition from November to January. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.30 5 40.17 15 6.9 1.443 1.911 101 16.5 4:29 (335, 68) Oct. 7 5 48.60 15 6.4 1.393 1.927 106 16.4 4:35 (351, 70) C/2005 EL173 ( LONEOS ) Appearing at dawn. Although it has not been observed since April, it must be already bright as 16.5 mag. It is observable at 15.5-16 mag until next 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) Sept.30 8 36.10 -16 15.6 4.566 4.119 57 16.4 4:29 (306, 18) Oct. 7 8 35.13 -17 37.7 4.450 4.099 63 16.4 4:35 (313, 22) C/2004 B1 ( LINEAR ) It was observed as 12 mag in spring. It was diffuse visually, but bright and enjoyable with a large telescope. However, it has already faded down to 16.1 mag (Sept. 1, Mitsunori Tsumura). It keeps observable in good condition until autumn. It will be very low in November, but it will be getting higher in the morning sky after that. So it keeps observable for a long time until it becomes too faint. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.30 15 30.50 25 59.0 3.819 3.319 53 16.4 19:10 ( 99, 35) Oct. 7 15 34.52 25 47.3 3.931 3.387 50 16.5 19:00 (101, 32) 76P/West-Kohoutek-Ikemura It was 18.3 mag in early September. fainter than originally expected by about 1 mag. It will brighten very rapidly in the morning sky after this. It will be observable in an excellent condition in November and December. But it may be 14.5 mag at best. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.30 6 23.20 5 4.6 1.341 1.680 90 16.8 4:29 (324, 55) Oct. 7 6 37.03 6 22.6 1.264 1.661 93 16.4 4:35 (331, 58) C/2005 B1 ( Christensen ) It kept 16.5 mag for a year and a half since early 2005. Now it is at opposition and observable in very good condition. However, it will start fading after November, and will be fainter than 18 mag at the end of 2006. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.30 0 3.32 43 40.4 3.003 3.813 138 16.5 23:26 (180, 81) Oct. 7 23 55.85 41 15.8 3.010 3.848 142 16.5 22:51 (180, 84) 2006 QL39 Peculiar asteroid moving along an orbit like a comet. It is at opposition in October. It will reach to 16.5 mag and will be observable in excellent condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.30 1 13.66 -0 41.7 1.433 2.420 167 16.8 0:41 ( 0, 54) Oct. 7 1 10.59 -1 59.5 1.396 2.388 171 16.7 0:10 ( 0, 53) C/2006 CK10 ( Catalina ) It was observed at 17 mag in spring. It will be observable in good condition at 17 mag again in autumn. It will be fainter than 18 mag in December. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.30 5 31.94 15 15.1 1.612 2.085 103 16.7 4:29 (340, 69) Oct. 7 5 12.00 11 47.5 1.509 2.133 114 16.7 4:11 ( 0, 67) 112P/Urata-Niijima Although it was so faint as 20.7 mag on Aug. 2 (P. Birtwhistle), it brightened up to 17.9 mag on Sept. 18 (Ken-ichi Kadota). The condition of this apparition is excellent. It will brighten furthermore rapidly after this, and it is expected to reach to 16.5 mag in October and November. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.30 4 29.88 22 42.1 0.747 1.499 117 17.1 3:56 ( 0, 78) Oct. 7 4 41.01 27 16.2 0.699 1.485 120 16.9 3:39 ( 0, 82) C/2006 M1 ( LINEAR ) It keeps 17 mag for a long time after this until the end of 2007. It will be observable in good condition in 2006 autumn and 2007 autumn. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.30 19 28.06 43 36.4 3.403 3.763 103 16.9 19:10 (159, 81) Oct. 7 19 32.19 42 32.5 3.414 3.743 101 16.9 19:00 (143, 80) P/2004 F3 ( NEAT ) It was bright as 15 mag in 2004 and 2005. Now it is far away from the sun, but it is still observed at 17 mag in 2006. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.30 0 54.17 -16 7.2 3.141 4.095 159 17.1 0:21 ( 0, 39) Oct. 7 0 49.51 -16 25.8 3.167 4.112 158 17.1 23:45 ( 0, 39) C/2005 S4 ( McNaught ) It is outside of Jupiter's orbit. So it keeps 16.5-17.5 mag for a long time until 2008. In 2006, it keeps observable in good condition until November. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.30 20 42.44 -14 1.9 5.606 6.203 122 17.2 20:06 ( 0, 41) Oct. 7 20 38.64 -13 41.9 5.700 6.187 114 17.2 19:35 ( 0, 41) C/2004 L2 ( LINEAR ) It reached up to 16 mag in 2005 summer in the Southern Hemisphere. It was 16.6 mag on Sept. 19 (Mitsunori Tsumura), a bit brighter than this ephemeris. It will keep 17.5 mag until January after this. Then it will be fainter than 18 mag in February. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.30 5 50.03 -22 41.1 4.452 4.679 96 17.3 4:29 (347, 31) Oct. 7 5 49.78 -22 57.0 4.410 4.713 101 17.3 4:35 (356, 32) P/2005 L1 ( McNaught ) It was observed at 17 mag in 2005 summer. It will reach to 17 mag again in 2006 summer. However, no observations have been reported yet in 2006. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.30 22 20.82 -14 42.8 2.514 3.383 144 17.3 21:44 ( 0, 40) Oct. 7 22 18.93 -14 58.8 2.588 3.393 137 17.4 21:15 ( 0, 40) 41P/Tuttle-Giacobini-Kresak It brightened much more rapidly than expected after late April, and reached to 9.5 mag on June 15 (Willian Souza). Then it had faded out very rapidly. In late August, it was still bright as 12.7 mag visually (Aug. 27, Juan Jose Gonzalez), however, it was already so faint as 17 mag by CCD. It has not been observed since September even by CCD observers. Although it keeps higher than 20 degree in the evening sky until November, it will no longer be observed in this apparition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.30 17 15.28 -18 40.9 1.736 1.729 72 17.3 19:10 ( 40, 26) Oct. 7 17 35.10 -19 30.2 1.852 1.790 70 17.9 19:00 ( 39, 25) C/2006 K4 ( NEAT ) It will reach to 14.5 mag in 2007 summer, but it will be observable only in the Southern Hemisphere at that time. Now it is 17.2 mag (Aug. 27, J. Young). In the Northern Hemisphere, it keeps observable at 17.5 mag in good condition until autumn. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.30 19 25.04 -0 45.5 4.679 5.035 105 17.4 19:10 ( 9, 54) Oct. 7 19 23.27 -2 1.8 4.748 4.989 98 17.4 19:00 ( 16, 52) C/2003 K4 ( LINEAR ) It reached to 6 mag in 2004. It had been visible visually until January. It has already faded down to 17.2 mag (Aug. 9, Ken-ichi Kadota). It will be fading slowly around 17-18 mag until December. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.30 2 53.30 -3 3.8 7.098 7.914 142 17.4 2:20 ( 0, 52) Oct. 7 2 49.46 -3 23.3 7.099 7.971 148 17.5 1:49 ( 0, 52) C/2005 R4 ( LINEAR ) It was observed at 17 mag in late 2005. In 2006 autumn, it became observed again. It will be observable at 17.5 mag in good condition until November. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.30 2 18.09 23 54.8 4.562 5.415 145 17.5 1:45 ( 0, 79) Oct. 7 2 8.42 23 29.1 4.515 5.430 153 17.5 1:08 ( 0, 79) 173P/2005 T1 ( Mueller 5 ) 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) Sept.30 4 54.93 11 4.3 4.389 4.860 112 17.6 4:21 ( 0, 66) Oct. 7 4 55.05 10 59.3 4.282 4.847 119 17.5 3:54 ( 0, 66) 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) Sept.30 4 50.04 46 37.2 3.475 3.901 107 17.6 4:16 (180, 78) Oct. 7 4 51.69 47 32.7 3.384 3.893 113 17.6 3:50 (180, 77) P/2006 S1 ( Christensen ) New comet. It was discovered because it passed very close by Earth. Howver, because it is very small, it will fade out very rapidly. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.30 23 45.12 19 7.6 0.419 1.404 160 17.6 23:09 ( 0, 74) Oct. 7 23 54.61 15 55.3 0.440 1.426 162 17.8 22:51 ( 0, 71) P/2006 H1 ( McNaught ) It will be fainter than 18 mag soon. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.30 23 23.70 -5 36.0 1.698 2.672 162 17.7 22:47 ( 0, 49) Oct. 7 23 19.71 -5 17.6 1.758 2.698 155 17.8 22:15 ( 0, 50) 74P/Smirnova-Chernykh It is observable at 18 mag in 2006 autumn. It will reach to 15 mag two years later. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.30 2 31.33 8 40.8 3.660 4.539 147 18.0 1:58 ( 0, 64) Oct. 7 2 28.11 8 24.1 3.604 4.532 155 17.9 1:27 ( 0, 63)