6216 San Jose

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6216 San Jose
Discovery [1]
Discovered byS. J. Bus
Discovery sitePalomar Obs.
Discovery date30 September 1975
(6216) San Jose
Named after
San Jose[1]
(City in California)
1975 SJ · 1975 VH2
1984 SV4 · 1989 VG
main-belt[1][2] · (middle)
Orbital characteristics[2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc62.86 yr (22,961 d)
Aphelion3.0346 AU
Perihelion2.4719 AU
2.7533 AU
4.57 yr (1,669 d)
0° 12m 56.52s / day
Physical characteristics
Mean diameter
8.033±0.149 km[4]

6216 San Jose, provisional designation 1975 SJ, is a background asteroid from the central regions of the asteroid belt, approximately 8 kilometers (5 miles) in diameter. It was discovered on 30 September 1975, by American astronomer Schelte Bus at the Palomar Observatory. The asteroid was named for the city of San Jose in California.[1]

Orbit and classification[edit]

San Jose is a non-family asteroid from the main belt's background population.[3] It orbits the Sun in the central asteroid belt at a distance of 2.5–3.0 AU once every 4 years and 7 months (1,669 days; semi-major axis of 2.75 AU). Its orbit has an eccentricity of 0.10 and an inclination of 4° with respect to the ecliptic.[2] The body's observation arc begins with a precovery taken at Palomar in April 1954.[1]

Physical characteristics[edit]

San Jose's spectral type is unknown.[2] Based on its albedo (see below), it is likely a stony S-type asteroid. It has an absolute magnitude of 13.0.[2]

Diameter and albedo[edit]

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, San Jose measures 8.033 kilometers in diameter and its surface has an albedo of 0.208.[4]

Rotation period[edit]

As of 2018, no rotational lightcurve of San Jose has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown.[2]


This minor planet was named for the city of San Jose, California, United States, for its long support of nearby Lick Observatory particularly in efforts to reduce light pollution.[5] The official naming citation was published by the Minor Planet Center on 14 December 1997 (M.P.C. 31024).[6]


  1. ^ a b c d e "6216 San Jose (1975 SJ)". Minor Planet Center. Retrieved 13 April 2018.
  2. ^ a b c d e f g "JPL Small-Body Database Browser: 6216 San Jose (1975 SJ)" (2018-02-25 last obs.). Jet Propulsion Laboratory. Retrieved 13 April 2018.
  3. ^ a b "Asteroid 6216 San Jose – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 29 October 2019.
  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:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 13 April 2018.
  5. ^ Jim Burns (25 May 1998). "UCSC, Lick Observatory designate asteroid for the city of San Jose". University of California, Santa Cruz. Archived from the original on 21 April 2008.
  6. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 13 April 2018.

External links[edit]