Weekly Information about Bright Comets (2010 Aug. 21: South)

Japanese version Home page	Updated on August 22, 2010
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Best time and the azimuth, altitude (A,h) are at lat. 35 deg in the Southern Hemisphere. Azimuth indicates 0 for south, 90 for west, 180 for north, 270 for east.

2P/Encke Appearing in the evening sky in the Southern Hemisphere. Now it is bright, but fading rapidly as 7.7 mag on Aug. 17 and 9.0 mag on Aug. 20 (Chris Wyatt). It will keep observable while fading rapidly after this in the Southern Hemisphere. It is not observable in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 21 11 27.12 -1 58.3 1.150 0.504 25 8.5 18:57 ( 93, 9) Aug. 28 12 19.13 -9 15.1 1.115 0.633 34 9.4 19:02 ( 90, 17) C/2009 R1 ( McNaught ) Appearing in the morning sky in the Southern Hemisphere. It approached to the sun down to 0.4 A.U. in July, and was expected to reach up to 2-3 mag. But actually, it brightened only up to 5 mag at best. It will keep observable while fading after this in the Southern Hemisphere. In the Northern Hemisphere, it will never be observable again. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 21 9 36.78 -19 24.6 1.933 1.204 32 8.9 5:09 (290, 5) Aug. 28 9 48.70 -24 25.2 2.015 1.328 35 9.5 5:01 (293, 9) 10P/Tempel 2 Brightened rapidly. Now it is so bright as 8.4 mag (Aug. 18, Alexandre Amorim). It keeps observable bright as 9-10 mag for a long time until autumn. A thin straight dust trail is visible. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 21 1 31.58 -13 8.3 0.652 1.506 128 9.5 3:35 (180, 68) Aug. 28 1 36.81 -14 37.8 0.651 1.531 133 9.6 3:13 (180, 70) 103P/Hartley 2 Brightening rapidly. Now it is 11.4 mag (Aug. 21, Jakub Cerny). This apparition is best condition. It will approach to the earth down to 0.12 A.U. in October, and brighten up to 5 mag. It will be visible with naked eyes. In the Northern Hemisphere, it keeps observable all through this apparition until 2011 June when it fades down to 17 mag. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 21 22 40.83 32 30.9 0.491 1.399 134 11.1 0:45 (180, 23) Aug. 28 22 46.44 35 52.5 0.428 1.343 133 10.4 0:23 (180, 19) C/2009 K5 ( McNaught ) It brightened up to 7.9 mag in April and May (May 5, Juan Jose Gonzalez). Now it is fading. But it is still bright as 10.8 mag (Aug. 20, Juan Jose Gonzalez). It keeps observable for a long time until when it fades out in the Northern Hemisphere. It will be visible visually until autumn. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 21 8 11.76 52 57.0 2.687 2.114 46 12.0 5:09 (219,-20) Aug. 28 8 13.84 52 15.7 2.688 2.182 50 12.2 5:01 (218,-18) 43P/Wolf-Harrington It brightened up to 15.5 mag in January (Jan. 31, C. Rinner, F. Kugel). It is not observable now. The condition of this apparition is bad. It will reach up to 11-12 mag from spring to autumn, but it is not observable. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 21 8 41.87 10 39.8 2.389 1.471 19 12.2 5:09 (258, -1) Aug. 28 9 1.85 8 38.0 2.404 1.502 20 12.4 5:01 (260, 0) C/2006 W3 ( Christensen ) It reached up to 7.7 mag in last summer (2009 Aug. 13, Chris Wyatt). It is fading now. It has already faded down to 12.6 mag (Aug. 7, Marco Goiato). In the Southern Hemisphere, it keeps observable for a long time after this. In the Northern Hemisphere, it is only observable in the extremely low sky. It will be getting lower gradually, then it will never be observable again. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 21 17 30.24 -47 48.5 4.419 4.922 114 12.8 19:32 ( 0, 77) Aug. 28 17 24.33 -47 41.3 4.575 4.968 107 13.0 19:02 ( 3, 77) 65P/Gunn Now it is 11.7 mag (Aug. 6, Juan Jose Gonzalez). It will keep 12-13 mag until autumn. But it locates somewhat low in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 21 20 40.66 -33 27.3 1.717 2.654 152 13.1 22:41 (180, 88) Aug. 28 20 37.02 -33 27.8 1.774 2.671 145 13.2 22:10 (180, 88) 29P/Schwassmann-Wachmann 1 Now it is unobservable. It will appear in the morning sky again in October. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 21 10 15.32 7 40.4 7.231 6.226 6 14.3 18:57 ( 91,-12) Aug. 28 10 20.18 7 9.0 7.235 6.227 3 14.3 5:01 (272,-15) 81P/Wild 2 It reached up to 9.2 mag in March (Mar. 20, Marco Goiato). Now it is fading. It has already faded down to 12.2 mag (Aug. 6, Juan Jose Gonzalez). It keeps observable in a good condition for a long time. It keeps observable until autumn when it fades down to 16 mag. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 21 15 32.52 -16 9.1 2.122 2.303 87 14.4 18:57 (130, 64) Aug. 28 15 43.30 -16 56.8 2.242 2.344 83 14.6 19:02 (121, 61) C/2009 P1 ( Garradd ) Already bright as 12.8 mag and visible visually (Aug. 20, Juan Jose Gonzalez). It is expected to keep so bright as 6-8 mag for a long time from 2011 to 2012, and to be observable in good condition in the Northern Hemisphere. In 2010, it is observable in good condition in the Southern Hemisphere while brightening slowly. It locates low in the Northern Hemisphere, but it keeps observable until the end of 2010. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 21 23 22.28 -37 17.2 4.800 5.690 148 14.5 1:27 ( 0, 88) Aug. 28 23 14.51 -37 42.1 4.731 5.629 150 14.4 0:52 ( 0, 87) C/2006 S3 ( LONEOS ) Now it is 15.3 mag (July 18, Hiroshi Abe). It will be observable at 13-14 mag for a long time from 2011 to 2012. In 2010, it is observable at 15-16 mag in good condition from spring to autumn. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 21 20 55.59 -0 34.6 5.846 6.807 160 15.1 22:56 (180, 56) Aug. 28 20 49.19 -1 6.9 5.848 6.774 154 15.1 22:22 (180, 56) C/2008 FK75 ( Lemmon-Siding Spring ) Now it is very bright as 14.2 mag (July 8, Toni Scarmato). It keeps observable at 14-15 mag for a long time in 2010. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 21 17 25.43 40 24.9 4.274 4.522 97 15.2 19:27 (180, 15) Aug. 28 17 26.80 39 46.4 4.313 4.519 95 15.2 19:02 (180, 15) C/2009 F4 ( McNaught ) Now it is 15.0 mag (June 2, Hidetaka Sato). It keeps bright as 14-15 mag for a long time after this until 2013. It is observable in good condition in the Southern Hemisphere. However, it is not observable in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 21 14 21.62 -47 35.7 6.581 6.541 83 15.2 18:57 ( 54, 59) Aug. 28 14 22.95 -47 40.8 6.652 6.514 77 15.3 19:02 ( 55, 54) C/2007 Q3 ( Siding Spring ) It brightened up to 9.5 mag in January (Jan. 13, Juan Jose Gonzalez). Now it is fading. But it is still bright as 14.5 mag (Aug. 9, Toshiyuki Takahashi). It will be also visible visually still now. It will be fainter than 18 mag at the end of 2010. In the Northern Hemisphere, it keeps observable for a long time, although it will be getting lower gradually. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 21 15 12.52 46 42.1 4.256 4.078 73 15.4 18:57 (163, 5) Aug. 28 15 19.76 45 17.0 4.342 4.134 71 15.5 19:02 (158, 5) C/2010 B1 ( Cardinal ) Not observed since May, but appearing in the morning sky. It will be observable at 14 mag in good condition in winter. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 21 7 33.57 30 43.6 4.123 3.389 38 16.2 5:09 (232, -1) Aug. 28 7 37.63 29 31.8 4.012 3.356 43 16.1 5:01 (231, 2) 240P/2010 P1 ( NEAT ) Recovered as bright as expected. Now it is 16.5 mag (Aug. 11, Hidetaka Sato). It is observable at 15.5 mag in good condition from autumn to winter. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 21 5 12.82 13 51.5 2.285 2.152 69 16.8 5:09 (217, 33) Aug. 28 5 25.19 14 43.6 2.207 2.144 73 16.7 5:01 (215, 33) 126P/IRAS Now it is 16.5 mag (July 11, C. Rinner, F. Kugel). It keeps observable while fading gradually, and it will be fainter than 18 mag in November. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 21 6 17.07 61 41.0 2.810 2.523 63 16.8 5:09 (201,-14) Aug. 28 6 39.46 62 53.2 2.804 2.571 66 16.9 5:01 (201,-15) C/2010 J2 ( McNaught ) Now it is 16.7 mag (June 13, Hidetaka Sato). It will be observable at 17 mag in good condition in summer. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 21 19 2.85 0 24.2 2.681 3.465 134 17.0 21:03 (180, 55) Aug. 28 18 51.05 0 44.1 2.792 3.479 125 17.1 20:24 (180, 54) C/2008 S3 ( Boattini ) Now it is 17.4 mag (July 11, C. Rinner, F. Kugel). It keeps 17 mag for a long time from 2009 to 2012. It is observable in good condition in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 21 2 22.17 21 20.3 7.850 8.209 107 17.1 4:26 (180, 34) Aug. 28 2 18.89 21 18.6 7.725 8.200 114 17.1 3:55 (180, 34) 219P/2009 H1 ( LINEAR ) It was observed at 17 mag in summer and autumn in 2009. It will be observable again at 17 mag in good condition in summer and autumn also in 2010. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 21 3 11.40 22 59.9 2.296 2.604 96 17.1 5:09 (182, 32) Aug. 28 3 16.70 23 7.2 2.227 2.622 101 17.1 4:53 (180, 32) C/2009 UG89 ( Lemmon ) Now it is 17.2 mag (July 21, Ken-ichi Kadota). It keeps observable at 17-18 mag for a long time until 2011 summer. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 21 18 34.50 12 43.0 3.416 4.061 123 17.3 20:35 (180, 42) Aug. 28 18 24.94 12 26.9 3.497 4.046 116 17.3 19:58 (180, 43) 223P/2009 L18 ( Skiff ) Now it is 19.3 mag (July 21, W. Hasubick). It will be observable at 17 mag in good condition from autum to winter. But actually, it is much fainter than expected. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 21 2 39.61 36 37.1 2.061 2.421 98 17.4 4:44 (180, 18) Aug. 28 2 44.47 38 46.4 1.991 2.422 102 17.3 4:21 (180, 16) 236P/2010 K1 ( LINEAR ) Now it is 17.9 mag (Aug. 20, C. Rinner, F. Kugel). It is observable at 17.5 mag in good condition from summer to autumn. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 21 0 50.85 33 23.3 1.124 1.839 118 17.9 2:55 (180, 22) Aug. 28 0 56.03 34 26.2 1.076 1.834 123 17.8 2:33 (180, 21) C/2009 U1 ( Garradd ) It is observable at 18 mag in good condition from autumn to winter. It has not been observed since 2009 October. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 21 6 5.67 38 25.2 3.410 2.996 57 17.9 5:09 (214, 6) Aug. 28 6 14.69 40 21.4 3.330 3.007 62 17.9 5:01 (211, 5)