3333 Schaber

3333 Schaber, provisional designation 1980 TG5, is a dark background asteroid from the outer regions of the asteroid belt, approximately 26 kilometers (16 miles) in diameter. It was discovered on 9 October 1980, by American astronomer Carolyn Shoemaker at the Palomar Observatory in California.[1] The presumably elongated C-type asteroid has a rotation period of 10.97 hours.[3] It was named after American geologist Gerald Schaber of the USGS.[1]

3333 Schaber
Discovery [1]
Discovered byC. Shoemaker
Discovery sitePalomar Obs.
Discovery date9 October 1980
Designations
(3333) Schaber
Named after
Gerald Gene Schaber [1]
(American geologist)
1980 TG5 · 1964 WR
1975 XM2
main-belt [1][2] · (outer) [3]
background [4]
Orbital characteristics [2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc52.42 yr (19,147 d)
Aphelion3.8276 AU
Perihelion2.4390 AU
3.1333 AU
Eccentricity0.2216
5.55 yr (2,026 d)
333.25°
0° 10m 39.72s / day
Inclination11.967°
231.17°
66.155°
Physical characteristics
Mean diameter
25.44 km (calculated)[3]
26.538±0.262 km[5][6]
27.67±0.52 km[7]
10.971±0.002 h[8]
0.044±0.002[7]
0.048±0.010[5][6]
0.057 (assumed)[3]
C (assumed)[3]
11.7[2][3] · 11.80[7][6]
12.05±0.25[9]

    Orbit and classification

    Schaber is a non-family asteroid from the main belt's background population.[4] It orbits the Sun in the outer asteroid belt at a distance of 2.4–3.8 AU once every 5 years and 7 months (2,026 days; semi-major axis of 3.13 AU). Its orbit has an eccentricity of 0.22 and an inclination of 12° with respect to the ecliptic.[2]

    The asteroid was first observed as 1964 WR at the Purple Mountain Observatory in November 1969. The body's observation arc begins at Palomar on 7 October 1980, or two nights prior to its official discovery observation.[1]

    Physical characteristics

    Schaber is an assumed C-type asteroid.[3]

    Rotation period

    In September 2009, a rotational lightcurve of Schaber was obtained from photometric observations by Maurice Clark at the Montgomery College Observatory in Maryland. Lightcurve analysis gave a rotation period of 10.971 hours with a brightness amplitude of 0.46 magnitude, indicative for a somewhat elongated shape (U=3-).[8]

    Diameter and albedo

    According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Schaber measures 26.538 and 27.67 kilometers in diameter and its surface has an albedo of 0.048 and 0.044, respectively.[5][6][7]

    The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 25.44 kilometers based on an absolute magnitude of 11.7.[3]

    Naming

    This minor planet was named after American Gerald Gene Schaber, geologist with the United States Geological Survey, who headed the USGS's astrogeology branch in the 1980s. He has studied the geology of the Moon, Mars, Venus and Mercury as well as that of Jupiter's volcanic moon Io.[1] Schaber also named the North Complex, a feature on the lunar surface. The official naming citation was published by the Minor Planet Center on 26 March 1986 (M.P.C. 10549).[10]

    References
    1. "3333 Schaber (1980 TG5)". Minor Planet Center. Retrieved 10 April 2018.
    2. "JPL Small-Body Database Browser: 3333 Schaber (1980 TG5)" (2017-04-30 last obs.). Jet Propulsion Laboratory. Retrieved 10 April 2018.
    3. "LCDB Data for (3333) Schaber". Asteroid Lightcurve Database (LCDB). Retrieved 10 April 2018.
    4. "Asteroid 3333 Schaber – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 29 October 2019.
    5. 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.
    6. 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.
    7. Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 17 October 2019. (online, AcuA catalog p. 153)
    8. Clark, Maurice (October 2008). "Asteroid Lightcurve Observations". The Minor Planet Bulletin. 35 (4): 152–154. Bibcode:2008MPBu...35..152C. ISSN 1052-8091.
    9. 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.
    10. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 10 April 2018.

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