13006 Schwaar

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13006 Schwaar
Discovery [1]
Discovered by B. A. Skiff
Discovery site Anderson Mesa Stn.
Discovery date 12 January 1983
MPC designation (13006) Schwaar
Named after
Pierre–Yves Schwaar
(amateur astronomer)[2]
1983 AC1 · 1990 DH
main-belt · Phocaea[3]
Orbital characteristics[1]
Epoch 16 February 2017 (JD 2457800.5)
Uncertainty parameter 0
Observation arc 33.83 yr (12,357 days)
Aphelion 2.7335 AU
Perihelion 1.8143 AU
2.2739 AU
Eccentricity 0.2021
3.43 yr (1,252 days)
0° 17m 14.64s / day
Inclination 28.524°
Physical characteristics
Dimensions 5.04 km (calculated)[3]
5.892±0.113 km[5]
6.8 h[6]
0.23 (assumed)[3]
13.6[5] · 13.7[1][3] · 13.97±0.22[7]

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.[8]

The stony S-type asteroid is a member of the Phocaea family, a rather small group of asteroids with similar orbital characteristics, named after its largest member, 25 Phocaea. It orbits the Sun at a distance of 1.8–2.7 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.[8]

A rotational light-curve for this asteroid was obtained from photometric observations made at the Hunters Hill Observatory (E14), Australia, and collaborating stations in December 2006. The light-curve gave a rotation period of 6.8 hours with a brightness variation of 0.17 in magnitude (U=3-).[6] According to the survey carried out by the NEOWISE mission of NASA's space-based Wide-field Infrared Survey Explorer, the asteroid measures 5.3 and 5.9 kilometers in diameter and its surface has an albedo of 0.182 and 0.185, respectively,[5][4] 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.[3]

The minor planet was named in memory amateur astronomer Pierre–Yves Schwaar (1946–2000), member of the Saguaro Astronomy Club (SAC), telescope maker, and photographer of the night sky.[2] Naming citation was published on 9 January 2001 (M.P.C. 41939).[9] 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.


  1. ^ a b c d "JPL Small-Body Database Browser: 13006 Schwaar (1983 AC1)" (2016-11-11 last obs.). Jet Propulsion Laboratory. Retrieved 3 December 2016. 
  2. ^ a b Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (13006) Schwaar. Springer Berlin Heidelberg. p. 791. ISBN 978-3-540-00238-3. Retrieved 25 May 2016. 
  3. ^ a b c d e f "LCDB Data for (13006) Schwaar". Asteroid Lightcurve Database (LCDB). Retrieved 25 May 2016. 
  4. ^ a b c Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096Freely accessible. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 3 December 2016. 
  5. ^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 25 May 2016. 
  6. ^ a b Higgins, David; Oey, Julian (September 2007). "Asteroid Lightcurve Analysis at Hunters Hill Observatory and Collaborating Stations - December 2006 - April 2007". The Minor Planet Bulletin. 34 (3): 79–80. Bibcode:2007MPBu...34...79H. ISSN 1052-8091. Retrieved 25 May 2016. 
  7. ^ a b Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762Freely accessible. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 25 May 2016. 
  8. ^ a b "13006 Schwaar (1983 AC1)". Minor Planet Center. Retrieved 25 May 2016. 
  9. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 25 May 2016. 

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