3043 San Diego

3043 San Diego
Discovery [1]
Discovered by E. F. Helin
Discovery site Palomar Obs.
Discovery date 20 September 1982
Designations
MPC designation 3043 San Diego
Named after
 San Diego (city)[2]
1982 SA · 1974 SQ2
main-belt (inner)[1] · Hungaria [3][4][5]
Orbital characteristics [1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 41.66 yr (15,216 days)
Aphelion 2.1318 AU
Perihelion 1.7210 AU
1.9264 AU
Eccentricity 0.1066
2.67 yr (977 days)
220.01°
0° 22m 6.96s / day
Inclination 21.789°
351.11°
31.800°
Earth MOID 0.7340 AU
Physical characteristics
Dimensions 4.62 km (calculated)[4]
4.771±0.022 km[6]
5.040±0.082 km[1]
30.72±0.02 h (wrong)[7]
105.7±0.1 h (re-examined)[8]
0.252±0.048[1]
0.2817±0.0408[6]
0.30 (assumed)[4]
E [4]
13.6[1][6]
13.7[4]

    3043 San Diego, provisional designation 1982 SA, is a stony Hungaria asteroid and slow rotator from the inner regions of the asteroid belt, approximately 4.7 kilometers in diameter. It was discovered by American female astronomer Eleanor Helin on 30 September 1982, at the U.S. Palomar Observatory in California.[3]

    The bright E-type asteroid is a member of the Hungaria family, which form the innermost dense concentration of asteroids in the Solar System. The asteroid orbits the Sun at a distance of 1.7–2.1 AU once every 2 years and 8 months (977 days). Its orbit has an eccentricity of 0.11 and an inclination of 22° with respect to the ecliptic.[1] The first observation was taken at Crimea–Nauchnij in 1974, extending the asteroid's observation arc by 8 years prior to its discovery.[3]

    In March 2005, a rotational light-curve for this asteroid was obtained from photometric observations by U.S. astronomer Brian D. Warner at his Palmer Divide Observatory (PDO), Colorado. It gave a long rotation period of 105.7±0.1 hours with a brightness variation of 0.60 in magnitude (U=3-). The period was derived from a re-examined light-curve that originally gave a much shorter period of 30.72±0.02 hours with an amplitude of 0.37 in magnitude (U=0).[7] This previously published period was only preliminary and is now considered wrong upon re-examination.[4]

    According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the asteroid measures 4.8 kilometers in diameter and its surface has an albedo of 0.28,[6] while the Collaborative Asteroid Lightcurve Link assumes an albedo of 0.30 – a compromise value between 0.4 and 0.2, corresponding to the Hungaria asteroids as family and orbital group, respectively – and calculates a diameter of 4.6 kilometers, based on an absolute magnitude of 13.7.[4]

    The minor planet was named for the city of San Diego, California, in appreciation of the city council's efforts to reduce the local light pollution (see dark-sky movement). Palomar mountain is located within San Diego County, California, and the astronomers at the site were concerned that the light pollution from the city would ruin their ability to use the observatory. The council had voted to use Low-Pressure Sodium (LPS) vapor lamps for their street lights. This fixture only emitted light at one wavelength, which astronomers could readily filter out.[2] Naming citation was published on 13 July 1984 (M.P.C. 8914).[9]

    References

    1. 1 2 3 4 5 6 7 "JPL Small-Body Database Browser: 3043 San Diego (1982 SA)" (2016-05-18 last obs.). Jet Propulsion Laboratory. Retrieved 21 August 2016.
    2. 1 2 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (3043) San Diego. Springer Berlin Heidelberg. p. 251. ISBN 978-3-540-00238-3. Retrieved 21 August 2016.
    3. 1 2 3 "3043 San Diego (1982 SA)". Minor Planet Center. Retrieved 21 August 2016.
    4. 1 2 3 4 5 6 7 "LCDB Data for (3043) San Diego". Asteroid Lightcurve Database (LCDB). Retrieved 21 August 2016.
    5. ↑ Spratt, Christopher E. (April 1990). "The Hungaria group of minor planets". Journal of the Royal Astronomical Society of Canada. 84 (2): 123–131. Bibcode:1990JRASC..84..123S. ISSN 0035-872X.
    6. 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:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 21 August 2016.
    7. 1 2 Warner, Brian D. (September 2005). "Asteroid lightcurve analysis at the Palmer Divide Observatory - winter 2004-2005". The Minor Planet Bulletin. 32 (3): 54–58. Bibcode:2005MPBu...32...54W. ISSN 1052-8091. Retrieved 7 January 2016.
    8. ↑ Warner, Brian D.; Stephens, Robert, D.; Harris, Alan W.; Pravec, Petr (October 2009). "A Re-examination of the Lightcurves for Seven Hungaria Asteroids". The Minor Planet Bulletin. 36 (4): 176–179. Bibcode:2009MPBu...36..176W. ISSN 1052-8091. Retrieved 7 January 2016.
    9. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 21 August 2016.

    Further reading

    • Curtis Peebles, Asteroids: A History, 2000, Smithsonian Institution, ISBN 1-56098-389-2.

    External links

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