Waist Kohoutek, Ikemura comet
| Waist Kohoutek, Ikemura comet West-Kohoutek-Ikemura | |
|---|---|
| Temporary mark, another name | 76P 76P/1975 D1 = 1975IV = 1975b; |
| Classification | Comet |
| Orbital kind | Short periodic comet |
| Discovery | |
| Discovery day | October 15, 1974 UT (the first observation) |
| Detector | Richard Martin waist、ルボシュ Kohoutek、Toshihiko Ikemura |
| An orbital element and property Epoch: April 18, 2013 TT | |
| Orbit semimajor axis (a) | 3.47 au |
| Perihelion distance (q) | 1.60024 au |
| Aphelion distance (Q) | 5.34 au |
| Eccentricity (e) | 0.53903 |
| Revolution period (P) | 6.47 Year |
| Orbit angle of inclination (i) | 30.48 ° |
| Perihelion argument (ω) | 0.07 ° |
| Ascending node celestial longitude (Ω) | 84.12 ° |
| The last time perihelion passage | May, 2013 7.75 days TT |
| The next time perihelion passage | October, 2019 26.1 days TT |
| Physical property | |
| Absolute magnitude (H) | H1(14)=13.9 class |
| ■Project ■ Template | |
The short periodic comet that waist Kohoutek, the Ikemura comet (waist Kohoutek is good irregularity comet, Comet West-Kohoutek-Ikemura, 76P) was discovered in 1975.
Table of contents
Discovery
The discovery circumstances of this comet are complicated.
In the end of February, 1975, Czech astronomer ルボシュ Kohoutek discovered the 14th class comet form heavenly bodies which moved to southwestern - northeast direction on the plate which photographed Taurus on February 9, the same year. After extrapolating a movement direction, and photographing southwest and a northeast position because I did not know a movement direction on one piece of photograph, I rediscovered the thirteenth class comet from the plate top that supposed movement to the southwest on February 27, and photographed Aries and reported it to the astronomy telegram center station. This comet was announced as "Kohoutek" (1975b) [1].
Person of amateur astronomy Toshihiko Ikemura of Aichi photographed forecast position neighborhood using 500 millimeters of f/4.5 telephoto lens +103a-O films in (JST) at 19:00 on March 1 in order to photograph Kohoutek (1975b) at an observatory of Shinshiro-shi. However, got a wrong movement direction, and Ikemura photographed the position where was reverse to a forecast. Ikemura noticed a mistake during photography, but reported it through Tokyo Astronomical Observatory Hiroki Kosai newly as a comet on March 2, the following day because after just continuing it, and confirming several photographs, the twelfth class comet form heavenly bodies which moved adversely with the direction of forecasted Kohoutek came out.
I understood that the new comet which Ikemura discovered in observation of each place on March 1 was the same as the comet which Kohoutek photographed on February 27 and was announced some other time as "Kohoutek, Ikemura comet" (1975b) [2].
On the other hand, the comet which Kohoutek photographed on February 9 was identified with the 15th class comet which came out when Kohoutek photographed a position of the above-mentioned northeast in another thing with Kohoutek, the Ikemura comet on 27th and was announced as "Kohoutek" (1975c) [3]. This 1975c comet is called 75D/ Kohoutek now.
When the orbit of Kohoutek, the Ikemura comet (1975b) was calculated, I was identified with the unconfirmed heavenly bodies which a waist reported. In January, 1975, the Richard Martin waist of the European nandin astronomical observatory (ESO) reported that the twelfth class comet-formed heavenly bodies came out on the plate which photographed Phoenix on October 15, 1974 [4]. It was thought that three months passed, and I was lost sight by photography, but I was connected with this comet and was changed the name again with "waist Kohoutek, Ikemura comet" (1975b). Because an arc (observation period) spread at the same time, I was proved to be a short periodic comet [5].
Orbit
I described big tracks more than 30 years before discovery in perihelion distance 5au, a period, but was discovered in the Jupiter in 1972 when I approached 0.012au, and perihelion distance was shortened to 1.4au. I approach the Jupiter to 0.57au in 1983 and reach the current orbit of 6.5 years in perihelion distance 1.6au, a period.
The perihelion distance is shortened to 1.1au passing through 0.22au from the Jupiter in 2055 and will approach the earth in future to 0.24au in about December, 2057 that is the perihelion passage just after that. Furthermore, the perihelion distance is expected to become small passing through 0.49au from the Jupiter until 5.5 years in 1.02 - 0.97au, a period in 2067.
Appearance
I passed a perihelion by the recurrence of 1975 on February 25. According to the stating already, I was observed with brightness of the eleventh class - twelfth class.
The next perihelion passage that became the first recurrence is April 11, 1981. I was detected with the 100cm telescope of the European nandin astronomical observatory on November 12, 1980, and the perihelion passage became earlier than a forecast for 1.3 days. I was observed in approximately 17 classes.
Scutch of the Arizona University moon planet Institute detected the recurrence of 1987 with the 17th class by Kitt Peak astronomical observatory on September 28, 1987 [6]. In addition, I was detected with the 18th class independently on October 1 by Tsutomu Seki of Kochi. The observation condition by this recurrence does not have much observation badly.
Scutch detected the recurrence of 1993 in a 20.1 class in Kitt Peak on July 20, the same year [6]. Because I reached a perihelion at the position of the center, I was observed in up to 12 classes, but a recurrence condition was the worst, and the recurrence of next 2000 was almost over for non-observation.
By the recurrence of 2006, I was observed at the nuclear intensity of light 19th class for the first time on August 25, 2006 and was observed with the 15th class in each place at the beginning of 2007.
I am observed at the nuclear intensity of light 19th class by the recurrence of 2013 in January. A perihelion passes in May, but is expected to remain in the 18th class (as of April, 2013).
Footnote
- It is 1975b; ^ IAUC 2752 NEW X-RAY SOURCE; 1975a
- It is 1975b; ^ IAUC 2754 COMET KOHOUTEK
- It is 1975c; ^ IAUC 2755 1975b; 1975a; SN IN Anon GALAXY
- ^ IAUC 2741 Occn OF kappa Gem A BY 433 EROS: COMET WEST; N Per 1974
- It is 1975b; ^ IAUC 2756 1944 III; 1,974h
- The detection in the meaning before ^ a b 1995. I am treated as normal (for the first time) observation, and the comet mark is not dumped now.
References
- Astronomy guide editorial department, 編 "description of my new comet discovery" truth sentence temple Shinko Corporation, 1979
- 『Astronomy yearbook』1982、1989、1994、2007。 Truth sentence temple Shinko Corporation
Outside link
- 76P detail
- C&MS: 76P/West-Kohoutek-Ikemura
- JPL Small-Body Database Browser 76P/West-Kohoutek-Ikemura
- 76P/West-Kohoutek-Ikemura
| A comet in front: Kohoutek (75D) | Periodic comet Waist Kohoutek, Ikemura comet | The next comet: Long more comet |
This article is taken from the Japanese Wikipedia Waist Kohoutek, Ikemura comet
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