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) · Hungaria [3][4]
Orbital characteristics [1]
Epoch 27 June 2015 (JD 2457200.5)
Uncertainty parameter 0
Observation arc 41.24 yr (15,063 days)
Aphelion 2.1312 AU
Perihelion 1.7218 AU
1.9265 AU
Eccentricity 0.1062
2.67 yr (977 days)
72.783°
Inclination 21.787°
351.10°
31.636°
Earth MOID 0.7356 AU
Physical characteristics
Dimensions 4.771±0.022 km[5]
4.62 km (calculated)[3]
105.7±0.1 h[6]
30.72±0.02 h[7]
0.2817±0.0408[5]
0.3 (assumed)[3]
E [3]
13.6[1]

    3043 San Diego, provisional designation 1982 SA, is a bright, stony asteroid and slow rotator from the inner regions of the asteroid belt, about 4.7 kilometers in diameter. It was discovered by American female astronomer Eleanor Helin on September 30, 1982, at the U.S. Palomar Observatory in California. It is a member of the Hungaria family. Its provisional designation was 1982 SA, until May 3, 1984, when it was named after the city of San Diego, California.[8]

    The bright E-type asteroid is a member of the Hungaria family, which form the innermost dense concentration of asteroids in the Solar System. It orbits the Sun at a distance of 1.7–2.1 AU once every 2 years and 8 months (977 days). Its orbit is tilted by 22 degrees to the plane of the ecliptic and has an eccentricity of 0.11.[1] Photometric measurements of the asteroid made in 2005 at the U.S. Palmer Divide Observatory (PDO) in Colorado showed a light-curve with a rotation period of 30.72±0.02 hours and a brightness variation of 0.35±0.05 in magnitude. However, the obtained data was distrust and the period was considered to be only preliminary.[7] A re-examined light-curve at the PDO then rendered a much longer period of 105.7±0.1 hours with an amplitude of 0.60 in magnitude.[6]

    According to the surveys carried out by the Wide-field Infrared Survey Explorer and its NEOWISE mission, the asteroid's surface has an albedo of 0.28,[5] while the Collaborative Asteroid Lightcurve Link assumes an albedo of 0.30, a typical value for E-type bodies of this family.[3]

    The asteroid name was given to the city due to the council's efforts in the 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]

    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 3043 San Diego (1982 SA)" (2015-12-17 last obs.). Jet Propulsion Laboratory. Retrieved January 2016.
    2. 1 2 Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (3043) San Diego. Springer Berlin Heidelberg. p. 251. ISBN 978-3-540-29925-7. Retrieved January 2016.
    3. 1 2 3 4 5 "LCDB Data for (3043) San Diego". Asteroid Lightcurve Database (LCDB). Retrieved January 2016.
    4. ↑ 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.
    5. 1 2 3 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 January 2016.
    6. 1 2 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 January 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 January 2016.
    8. ↑ "3043 San Diego (1982 SA)". Minor Planet Center. Retrieved January 2016.

    External links

    Further reading

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


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