Japanese version Home Page Updated on May 5, 1999
May 5, 1999Near miss by recent bright new objectsMISAO Project Announce Mail (May 5, 1999) Hello. I am Seiichi Yoshida working on the MISAO project. Some bright novae, comets and near-earth asteroids were discovered between February and April. Here I introduce you the results of investigation if these objects were in the MISAO Project images by chance. The following objects are new objects brighter than 15 mag between February and April. Regrettably, we had taken images just beside of Nova Sgr 1999 and 1999 GU3.
Before showing the investigation results, let me describe how to see tha table. When the object is within the image field, (x,y) position on the image, the limiting magnitude of the image, and the image file name are output. In case of comets or asteroids, R.A. and Decl. of the object at the exposure time are also output. Example: Nova Sgr 1999 (x,y) Lm. Image ( 170.84, 509.28) 11.9 19990220/180mm/1800-2600-none-01.mtf This example means that Nova Sgr 1999 is within the field of the image "19990220/180mm/1800-2600-none-01.mtf", taken on Feb. 20 with 180-mm camera lens, and the position is (170,509). When the object is just out of the image field, instead of (x,y) position, the set of value "how much should the image have been shifted for the object to be within the field" is output for horizontal and vertical shift. When the value is 0.0, it means the image needs not to be shifted in that direction. Example: 1999 GU3 R.A. Decl. (x,y) Lm. Image 09 20 06.48 -22 51 47.9 [ -0.6 , 0.0 ] 12.0 19990328/180mm/0900-2000-none-02.mtf This example means that 1999 GU3 would have been within the field of the image "19990328/180mm/0900-2000-none-02.mtf", taken on Mar. 28 with 180-mm camera lens, if the image has been shifted 60% to the left. * Nova Sgr 1999Bright nova discovered on Apr. 25 as 8.6 mag. It was fainter than 14.2 mag on Apr. 20. Here is the result of the MISAO Project images investigation. (x,y) Lm. Image ( 170.84, 509.28) 11.9 19990220/180mm/1800-2600-none-01.mtf ( 171.19, 509.23) 11.9 19990220/180mm/1800-2600-none-02.mtf ( 157.54, 121.63) 11.6 19990220/180mm/1800-2800-none-01.mtf ( 157.32, 121.57) 11.9 19990220/180mm/1800-2800-none-02.mtf [ -0.7 , 1.8 ] 14.6 19990408/530mm/1800-2400-none-01.mtf [ -0.7 , 1.8 ] 14.2 19990408/530mm/1800-2400-none-02.mtf [ -0.7 , 1.2 ] 15.0 19990408/530mm/1800-2500-none-01.mtf [ -0.7 , 1.2 ] 15.0 19990408/530mm/1800-2500-none-02.mtf [ -0.7 , 0.5 ] 14.8 19990408/530mm/1800-2600-none-01.mtf [ -0.7 , 0.0 ] 14.3 19990408/530mm/1800-2700-none-01.mtf [ -0.7 , 0.0 ] 14.5 19990408/530mm/1800-2700-none-02.mtf [ -0.6 , 0.0 ] 13.3 19990408/530mm/1800-2800-none-01.mtf [ -0.6 , 0.0 ] 13.3 19990408/530mm/1800-2800-none-02.mtf [ -0.6 , -0.5 ] 12.3 19990408/530mm/1800-2900-none-01.mtf [ -0.6 , -0.5 ] 12.3 19990408/530mm/1800-2900-none-02.mtf [ -0.6 , -1.2 ] 12.9 19990408/530mm/1800-3000-none-01.mtf [ -0.6 , -1.2 ] 12.8 19990408/530mm/1800-3000-none-02.mtf [ 0.0 , 1.6 ] 11.7 19990414/M8-530-none-01.mtf Although the nova was within the field of images on Feb. 20, it was too early and too faint. When we ran our survey on Apr. 8, we took images just half an image size beside of the nova. If we have shifted the field 60% to the left, the nova would have been in the image. On Apr. 14, we took an image about one and half of the image size up to the nova. However, the nova was fainter than 14.2 mag on Apr. 20. So the nova would not have been detected even if it was in the field. * C/1999 H1 ( Lee )Bright comet discovered on Apr. 16 as 9 mag. Because it is in the southern sky, there are no images in the MISAO Project. * C/1999 H3 ( LINEAR )New comet discovered on Apr. 22. It is observed as about 14.5 mag. But there are no images containing 14.0 mag stars near by this comet in the MISAO Project. * 1999 BJ8Near-earth asteroid which brightened as 14 mag in mid February. There are no images containing 14.0 mag stars near by this object. * 1999 CV3Near-earth asteroid which brightened as 12 mag in mid February. There are no images containing 12.0 mag stars near by this object. * 1999 FANear-earth asteroid which brightened as 13 mag in early March. There are no images containing 12.0 mag stars near by this object. * 1999 GU3Near-earth asteroid discovered on Apr. 10. It brightened as 12 mag in mid April. Here is the result of the MISAO Project images investigation. R.A. Decl. (x,y) Lm. Image 09 20 06.48 -22 51 47.9 [ -0.6 , 0.0 ] 12.0 19990328/180mm/0900-2000-none-02.mtf 09 20 06.84 -22 51 44.6 [ -0.6 , 0.0 ] 11.7 19990328/180mm/0900-2000-none-01.mtf 09 20 07.40 -22 51 39.4 [ -0.6 , 0.6 ] 12.1 19990328/180mm/0900-1800-none-01.mtf 09 20 07.74 -22 51 36.2 [ -0.6 , 0.6 ] 11.9 19990328/180mm/0900-1800-none-02.mtf 12 07 39.81 +08 53 19.4 [ 0.8 , 0.8 ] 12.3 19990407/180mm/1230+1400-none-01.mtf 12 07 41.62 +08 53 40.3 [ 0.8 , 0.8 ] 12.4 19990407/180mm/1230+1400-none-02.mtf 12 07 43.77 +08 54 05.4 [ 0.8 , 0.0 ] 11.9 19990407/180mm/1230+1200-none-01.mtf 12 07 45.78 +08 54 28.8 [ 0.8 , 0.0 ] 12.0 19990407/180mm/1230+1200-none-02.mtf 12 07 47.96 +08 54 54.1 [ 0.8 , 0.0 ] 12.4 19990407/180mm/1230+1000-none-01.mtf 12 07 49.72 +08 55 14.6 [ 0.8 , 0.0 ] 12.1 19990407/180mm/1230+1000-none-02.mtf 12 07 51.76 +08 55 38.2 [ 0.8 , 0.0 ] 11.8 19990407/180mm/1230+0800-none-01.mtf 12 07 53.77 +08 56 01.7 [ 0.8 , 0.0 ] 11.8 19990407/180mm/1230+0800-none-02.mtf 12 07 56.85 +08 56 37.5 [ 0.8 , 0.0 ] 12.2 19990407/180mm/1230+0600-none-01.mtf 12 07 58.61 +08 56 57.9 [ 0.8 , 0.0 ] 12.2 19990407/180mm/1230+0600-none-02.mtf 12 08 01.55 +08 57 32.1 [ 0.8 , -0.6 ] 12.7 19990407/180mm/1230+0400-none-01.mtf 12 08 03.43 +08 57 53.9 [ 0.8 , -0.6 ] 12.6 19990407/180mm/1230+0400-none-02.mtf 12 08 05.49 +08 58 17.9 [ 0.7 , 1.1 ] 12.6 19990407/180mm/1230+1600-none-01.mtf 12 08 07.37 +08 58 39.7 [ 0.7 , 1.1 ] 12.3 19990407/180mm/1230+1600-none-02.mtf We ran our survey just before the discovery. We took images just 80% of an image size beside of the object. Especially, if we have shifted the field 80% to the right on Apr. 7, we could have caught this asteroid, I guess. * 1999 HF1Near-earth asteroid which brightened as 14 mag in mid April. There are no images containing 14.0 mag stars near by this object.
P.S. http://www.info.waseda.ac.jp/muraoka/members/seiichi/misao/ -- Seiichi Yoshida seiichi@muraoka.info.waseda.ac.jp http://www.info.waseda.ac.jp/muraoka/members/seiichi/index.html |