13006 Schwaar

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13006 Schwaar
Discovery [1]
Discovered byB. A. Skiff
Discovery siteAnderson Mesa Stn.
Discovery date12 January 1983
(13006) Schwaar
Named after
Pierre–Yves 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 arc34.21 yr (12,495 days)
Aphelion2.7336 AU
Perihelion1.8143 AU
2.2739 AU
3.43 yr (1,252 days)
0° 17m 14.64s / day
Physical characteristics
Dimensions5.04 km (calculated)[3]
5.892±0.113 km[6]
6.8 h[7]
0.23 (assumed)[3]
13.6[6] · 13.7[1][3] · 13.97±0.22[8]

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 Pierre–Yves Schwaar.[2]

Orbit and classification[edit]

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 1.8–2.7 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.[9]

Physical characteristics[edit]

Schwaar has been characterized as a S-type asteroid by Pan-STARRS photometric survey.[8]


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[edit]

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]


This 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] 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.


  1. ^ a b c d "JPL Small-Body Database Browser: 13006 Schwaar (1983 AC1)" (2017-03-29 last obs.). Jet Propulsion Laboratory. Retrieved 24 June 2017.
  2. ^ a b c Schmadel, Lutz D. (2007). "(13006) Schwaar". Dictionary of Minor Planet Names – (13006) Schwaar. Springer Berlin Heidelberg. p. 791. doi:10.1007/978-3-540-29925-7_8722. ISBN 978-3-540-00238-3.
  3. ^ a b c d e f "LCDB Data for (13006) Schwaar". Asteroid Lightcurve Database (LCDB). Retrieved 25 May 2016.
  4. ^ a b "Asteroid 13006 Schwaar – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 27 October 2019.
  5. ^ 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:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 3 December 2016.
  6. ^ 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:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 25 May 2016.
  7. ^ 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.
  8. ^ a b c 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:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 25 May 2016.
  9. ^ a b "13006 Schwaar (1983 AC1)". Minor Planet Center. Retrieved 25 May 2016.
  10. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 25 May 2016.

External links[edit]