(8975) Atthis
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Asteroid (8975) Atthis |
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|---|---|
| Properties of the orbit ( animation ) | |
| Orbit type | Inner main belt asteroid |
| Asteroid family | Hertha family |
| Major semi-axis | 2.4110 AU |
| eccentricity | 0.1272 |
| Perihelion - aphelion | 2.1043 AU - 2.7177 AU |
| Inclination of the orbit plane | 2.8382 ° |
| Length of the ascending node | 30.3566 ° |
| Argument of the periapsis | 161.4234 ° |
| Time of passage of the perihelion | August 3, 2020 |
| Sidereal period | 3.74 a |
| Mean orbital velocity | 19.19 km / s |
| Physical Properties | |
| Absolute brightness | 14.8 mag |
| history | |
| Explorer |
Cornelis Johannes van Houten , Ingrid van Houten-Groeneveld , Tom Gehrels |
| Date of discovery | 29th September 1973 |
| Another name | 4076 T-2 , 1996 VJ 39 |
| Source: Unless otherwise stated, the data comes from JPL Small-Body Database Browser . The affiliation to an asteroid family is automatically determined from the AstDyS-2 database . Please also note the note on asteroid items. | |
(8975) Atthis is an asteroid of the main inner belt that was discovered on September 29, 1973 by the Dutch astronomer couple Cornelis Johannes van Houten and Ingrid van Houten-Groeneveld . The discovery was made during the 2nd Trojan survey, during which Tom Gehrels surveyed field plates recorded with the 120 cm Oschin Schmidt telescope of the Palomar observatory at the University of Leiden , 13 years after the start of the Palomar-Leiden- Surveys .
The asteroid belongs to the Polana family (named after (142) Polana ), a subgroup of the Nysa group (named after (44) Nysa ). The Nysa group is also called the Hertha family (after (135) Hertha ). What all members of the families and groups mentioned have in common is that the orbits around the sun are in 2: 1 resonance with those of the planet Mars and are therefore stable over a longer period of time. The timeless (non- osculating ) orbital elements of (8975) Atthis are almost identical to those of eight smaller ones, if one considers the absolute brightness of 16.2, 16.4, 16.4, 16.6, 16.9, 17, 0, 17.9 and 17.4 compared to 14.8, asteroids: (103809) 2000 DB 19 , (127835) 2003 FX 104 , (165374) 2000 WB 114 , (194544) 2001 XO 65 , (200992) 2002 CU 144 , (231224) 2005 WW 159 , (316956) 2001 DK 90 and (342057) 2008 SE 2 .
(8975) Atthis is named after the kingfisher , whose scientific name is Alcedo atthis . At the time the asteroid was named on February 2, 1999, the kingfisher was on the Dutch Red List of Endangered Birds .
Web links
- (8975) Atthis in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
- (8975) Atthis in the Small-Body Database of the Jet Propulsion Laboratory of NASA at the California Institute of Technology (Caltech) in Pasadena , California (English)
Individual evidence
- ↑ The family status of the asteroids in the AstDyS-2 database (English, HTML; 51.4 MB)
- ^ Lutz D. Schmadel : Dictionary of Minor Planet Names . Springer, Heidelberg 2012, 6th edition, page 664 (English)