Waist comet
| Waist comet West | |
|---|---|
 | |
| Temporary mark, another name | C/1975 V1 = 1975n = 1976 VI, C/1975 V1-A (A nucleus) |
| Classification | Comet |
| An orbital element and property Epoch: J2000.0,1976March 3（UT） | |
| Orbit semimajor axis (a) | 6780.20 AU |
| Perihelion distance (q) | 0.19662600 AU |
| Aphelion distance (Q) | 13560.2 AU |
| Eccentricity (e) | 0.99997100 |
| Revolution period (P) | 558,300 years |
| Orbit angle of inclination (i) | 43.06640 degrees |
| Perihelion argument (ω) | 358.42700 degrees |
| Ascending node celestial longitude (Ω) | 118.92400 degrees |
| The last time perihelion passage | February, 1976 25.22160 days (UT) |
| The next time perihelion passage | - |
| Discovery | |
| Discovery day | 1975August 10 |
| Detector | Richard waist |
| ■Template (■ notebook ■ commentary )■ Project | |
A waist comet (- comet, Comet West; C/1975 V1) is a comet discovered on August 10, 1975 by the Richard Martin waist of the European nandin astronomical observatory (ESO). Even the naked eye becomes the seen vast comet in March, 1976 after the perihelion passage and is known as a beautiful comet representing the 20th century.
Discovery
At the mid-1970s, a project to make the photograph celestial map which covered a nandin was pushed forward in ESO of Chile. Therefore, I performed 掃天撮影 of the exposure using a Schmidt telescope of diameter 1m for a long time in ESO. The photographic plate which I photographed was sent to Geneva, Switzerland, and the investigation by the researcher was carried out there.
The Richard Martin waist which checked a series of dry plates which had been sent from ESO on November 5, 1975 discovered that the image which seemed to be a comet came out in a dry plate photographed on September 24. In the discovery position, the intensity of light was approximately 14 near Microscopium. These heavenly bodies had the top of the corner for 2-3 seconds, and the tail of the length of approximately ten seconds was seen, too. The waist checked whether these heavenly bodies did not appear in the different dry plate either. As a result, I found the heavenly bodies having the tail which was light to the dry plate which photographed the neighborhood of Grus on August 10 and August 13 coming out. The intensity of light of this time was approximately 16 [1].
Observation
It was still farther at the time of the discovery than Mars orbit, and it was expected again that it was in the naked eye comet because well-thought perihelion distance was very near about 0.2AU and the sun, but what I was able to observe at first only in the Southern Hemisphere did not attract attention in the world public except the astronomy fan too much at first because an intensity of light prediction of Kohoutek two years ago came again.
After discovery, the waist comet added to the intensity of light smoothly in the sky of the Southern Hemisphere. I was observed for the first time in the Northern Hemisphere on December 1 by Japanese Tsutomu Seki. The brightness of this time was 12.5. I reached the naked eye class in the middle of January, 1976 and came to be able to see it under the moonlight and the twilight. The nucleus of the comet was divided on February 19 just before the perihelion passage and showed sudden 増光 of approximately two classes with this. It was in the comet which I could observe even in broad daylight that the intensity of light reached approximately -3 at the time of the perihelion passage of February 25 and was since Ikenotani, Seki comet of 1965.
When it was the beginning of March, it was in the large comet which showed the tail which opened like the fan which reached approximately 20 degrees in the sky of the early morning. A dust tale was able to look at the clear synchronic band. The divided nucleus called the B nucleus separated with A nucleus for the first time later on March 5 and was observed. The rocket observation by NASA was carried out on this day, and it became clear that carbon and oxygen, a line spectrum of carbon monoxide were seen in the light of the comet by the observation by ultraviolet rays. The third, the C pit which was the fourth division nucleus, D nucleus were observed for the first time on March 11. In addition, the observation by the radio telescope is carried out over March 14 from March 12, too, and hydroxyl is radical in the comet•It was revealed that OH) existed.
The intensity of light of the comet gradually darkened in the end of March and was not able to observe C nucleus last on March 28. The intensity of light dimmed to the fourth class in April. As for the B nucleus, the D nucleus stayed away from A nucleus for approximately ten seconds for approximately 21 seconds at this time. I was less than a naked eye class, but a chase was continued by many observers afterwards, and the last observation report was carried out at the end of April on September 25.
Because I suppose, and the lightest A nucleus is performed after division as for the orbit calculation of the waist comet, as of 2006, I may use a mark called C/1975 V1-A in particular.
Outside link
This article is taken from the Japanese Wikipedia Waist comet
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