13006 Schwaar
Phocaea asteroid
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13006 Schwaar, provisional designation 1983 AC1, is a stony Phocaea asteroid from the inner regions of the asteroid belt, approximately 5 kilometers in diameter. It was discovered on 12 January 1983, by American astronomer Brian Skiff at Lowell's Anderson Mesa Station in Flagstaff, Arizona.[9] The asteroid was named after amateur astronomer PierreâYves Schwaar.[2]
| Discovery[1] | |
|---|---|
| Discovered by | B. A. Skiff |
| Discovery site | Anderson Mesa Stn. |
| Discovery date | 12 January 1983 |
| Designations | |
| (13006) Schwaar | |
Named after | PierreâYves Schwaar (American amateur astronomer)[2] |
| 1983 AC1 · 1990 DH | |
| main-belt · Phocaea[3][4] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 34.21 yr (12,495 days) |
| Aphelion | 2.7336 AU |
| Perihelion | 1.8143 AU |
| 2.2739 AU | |
| Eccentricity | 0.2021 |
| 3.43 yr (1,252 days) | |
| 29.457° | |
| 0° 17m 14.64s / day | |
| Inclination | 28.523° |
| 129.27° | |
| 358.22° | |
| Physical characteristics | |
| Dimensions | 5.04 km (calculated)[3] 5.325±0.052[5] 5.892±0.113 km[6] |
| 6.8 h[7] | |
| 0.182±0.038[5] 0.1850±0.0281[6] 0.23 (assumed)[3] | |
| S[3][8] | |
| 13.6[6] · 13.7[1][3] · 13.97±0.22[8] | |
Orbit and classification
Schwaar is a member of the Phocaea family (701),[4] a rather small group of asteroids with similar orbital characteristics, named after its largest member, 25 Phocaea. It orbits the Sun in the inner main-belt at a distance of 1.8â2.7 AU once every 3 years and 5 months (1,252 days). Its orbit has an eccentricity of 0.20 and an inclination of 29° with respect to the ecliptic.[1] No precoveries were taken. The asteroid's observation arc begins 20 days after its discovery.[9]
Physical characteristics
Schwaar has been characterized as a S-type asteroid by Pan-STARRS photometric survey.[8]
Lightcurves
A rotational lightcurve of Schwaar was obtained from photometric observations made at the Hunters Hill Observatory (E14), Australia, and collaborating stations in December 2006. The lightcurve gave a rotation period of 6.8 hours with a brightness variation of 0.17 in magnitude (U=3-).[7]
Diameter and albedo
According to the survey carried out by the NEOWISE mission of NASA's space-based Wide-field Infrared Survey Explorer, Schwaar measures 5.3 and 5.9 kilometers in diameter and its surface has an albedo of 0.182 and 0.185, respectively,[6][5] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for members of the Phocaea family of 0.23, and calculates a diameter of 5.0 kilometers with an absolute magnitude of 13.7.[3]
Naming
This minor planet was named in memory amateur astronomer PierreâYves Schwaar (1946â2000), member of the Saguaro Astronomy Club (SAC), telescope maker, and photographer of the night sky.[2] The official naming citation was published by the Minor Planet Center on 9 January 2001 (M.P.C. 41939).[10] The native Swiss amateur astronomer and immigrant to the U.S. was also an inventor and master craftsman, a model rocketeer, an USAF aircraft mechanic, a Vietnam veteran, and an eclipse chaser.
