2975 Spahr

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2975 Spahr
Discovery  [1]
Discovered by H. Potter
A. Lokalov
Discovery site Cerro El Roble Stn.
Discovery date8 January 1970
Designations
(2975) Spahr
Named after
 Timothy Spahr   [1]
(MPC director)
1970 AF1 ·1957 HU
1967 GH ·1970 AK1
1970 CB ·1978 PF4
main-belt   [1] [2]  ·(inner)
background   [3] [4]  · Flora   [5]
Orbital characteristics   [2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc 61.07 yr (22,304 d)
Aphelion 2.4621 AU
Perihelion 2.0351 AU
2.2486 AU
Eccentricity 0.0949
3.37 yr (1,232 d)
44.830°
0° 17m 32.28s / day
Inclination 6.8979°
236.58°
317.02°
Physical characteristics
Mean diameter
5.919±0.107  km [6]
6.032±0.082 km [7]
6.51 km(calculated) [5]
11.946±0.006  h [8]
0.24(assumed) [5]
0.4044±0.0445 [7]
0.419±0.085 [6]
S (SDSS-MOC) [9]
S (Pan-STARRS) [5] [10]
A (S3OS2-TH) [11]
A (S3OS2-BB) [11]
12.7 [7]
13.0 [1] [2]
13.1 [5]
13.81±0.38 [10]

    2975 Spahr, provisional designation 1970 AF1, is a bright background asteroid from the Flora region of the inner asteroid belt, approximately 6 kilometers (3.7 miles) in diameter. It was discovered on 8 January 1970, by Russian astronomers Hejno Potter and A. Lokalov at the Cerro El Roble Station near Santiago, Chile. [1] The S- or A-type asteroid has a rotation period of 11.9 hours. [5] It was named for Timothy Spahr, an American astronomer and former director of the Minor Planet Center. [12]

    Contents

    Orbit and classification

    Spahr is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements. [3] [4] Based on osculating Keplerian orbital elements, the asteroid has also been classified as a member of the Flora family ( 402 ), a giant asteroid family and the largest family of stony asteroids in the main-belt. [5]

    It orbits the Sun in the inner asteroid belt at a distance of 2.0–2.5  AU once every 3 years and 4 months (1,232 days; semi-major axis of 2.25 AU). Its orbit has an eccentricity of 0.09 and an inclination of 7° with respect to the ecliptic. [2]

    The asteroid was first observed as 1957 HU at the Johannesburg-Hartbeespoort Observatory ( 076 ) in April 1957. The body's observation arc begins as 1967 GH at Crimea-Nauchnij in April 1967, nearly 3 years prior to its official discovery observation at Cerro El Roble. [1]

    Physical characteristics

    In the SDSS-based taxonomy, Spahr is a stony S-type asteroid. [9] Pan-STARRS' survey also characterizes the body as an S-type, [5] [10] while in both, the Tholen- and SMASS-like taxonomy of the Small Solar System Objects Spectroscopic Survey (S3OS2), Spahr is an uncommon A-type asteroid. [4] [11]

    Rotation period

    In December 2009, a first rotational lightcurve of Spahr was obtained from photometric observations by French amateur astronomer René Roy. Lightcurve analysis gave a rotation period of 11.946 hours with a relatively high brightness amplitude of 0.47 magnitude ( U=3- ). [5] [8]

    Diameter and albedo

    According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Spahr measures between 5.919 and 6.032 kilometers in diameter and its surface has a high albedo between 0.4044 and 0.419. [6] [7] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from 8 Flora, the parent body of the Flora family – and consequently calculates a larger diameter of 6.51 kilometers using an absolute magnitude of 13.1. [5]

    Naming

    This minor planet was named after Timothy Bruce Spahr (born 1970), a discoverer of minor planets and comets such as 171P/Spahr and 242P/Spahr, as well as a co-discoverer of Callirrhoe and Albiorix (moon), satellites of Jupiter and Saturn, respectively. Spahr was with the photographic Bigelow Sky Survey, which searched for high-latitude minor planets using the 0.41-m Catalina Schmidt telescope. (This survey was superseded by the Catalina Sky Survey). Spahr also headed the Minor Planet Center (MPC) from 2000 to 2014. [13] The asteroid's name was proposed by his MPC-colleges Brian Marsden, Gareth Williams and Stephen Larson, [12] and published by the MPC on 3 May 1996 ( M.P.C. 27124). [14]

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    References

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    2. 1 2 3 4 "JPL Small-Body Database Browser: 2975 Spahr (1970 AF1)" (2018-05-24 last obs.). Jet Propulsion Laboratory . Retrieved 5 June 2018.
    3. 1 2 "Asteroid (2975) Spahr". AstDyS-2, Asteroids – Dynamic Site. Retrieved 5 June 2018.
    4. 1 2 3 "Asteroid 2975 Spahr". Small Bodies Data Ferret. Retrieved 5 June 2018.
    5. 1 2 3 4 5 6 7 8 9 10 "LCDB Data for (2975) Spahr". Asteroid Lightcurve Database (LCDB). Retrieved 5 June 2018.
    6. 1 2 3 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. S2CID   118745497.
    7. 1 2 3 4 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. S2CID   35447010. (catalog)
    8. 1 2 Behrend, Raoul. "Asteroids and comets rotation curves – (2975) Spahr". Geneva Observatory. Retrieved 5 June 2018.
    9. 1 2 Carvano, J. M.; Hasselmann, P. H.; Lazzaro, D.; Mothé-Diniz, T. (February 2010). "SDSS-based taxonomic classification and orbital distribution of main belt asteroids". Astronomy and Astrophysics. 510: 12. Bibcode:2010A&A...510A..43C. doi: 10.1051/0004-6361/200913322 . Retrieved 30 October 2019. (PDS data set)
    10. 1 2 3 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. S2CID   53493339.
    11. 1 2 3 Lazzaro, D.; Angeli, C. A.; Carvano, J. M.; Mothé-Diniz, T.; Duffard, R.; Florczak, M. (November 2004). "S3OS2: the visible spectroscopic survey of 820 asteroids" (PDF). Icarus. 172 (1): 179–220. Bibcode:2004Icar..172..179L. doi:10.1016/j.icarus.2004.06.006 . Retrieved 5 June 2018.
    12. 1 2 Schmadel, Lutz D. (2007). "(2975) Spahr". Dictionary of Minor Planet Names – (2975) Spahr. Springer Berlin Heidelberg. p. 245. doi:10.1007/978-3-540-29925-7_2976. ISBN   978-3-540-00238-3.
    13. ↑ "Tim Spahr of the Minor Planet Center – Planetary Radio". The Planetary Society. Retrieved 5 June 2018.
    14. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 5 June 2018.
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