14789 GAISH

14789 GAISH, provisional designation 1969 TY1, is a dark background asteroid from the outer regions of the asteroid belt, approximately 15 kilometers (9 miles) in diameter. It was discovered on 8 October 1969, by Soviet astronomer Lyudmila Chernykh of the Crimean Astrophysical Observatory at Nauchnij, on the Crimean peninsula.[1] The assumed C-type asteroid has a rotation period of 8.1 hours and possibly an elongated shape.[3] It was named for the Russian Sternberg Astronomical Institute (GAISh) of Moscow State University.[1]

14789 GAISH
Discovery [1]
Discovered byL. Chernykh
Discovery siteCrimean Astrophysical Obs.
Discovery date8 October 1969
Designations
(14789) GAISH
Named after
Sternberg Astronomical Institute (GAISh)[1]
(Moscow State University)
1969 TY1 · 1995 KQ2
1996 QW2 · 1999 CH69
main-belt [1][2] · (outer)[3]
background [4]
Orbital characteristics [2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc47.65 yr (17,405 d)
Aphelion3.4121 AU
Perihelion2.8333 AU
3.1227 AU
Eccentricity0.0927
5.52 yr (2,016 d)
301.75°
0° 10m 42.96s / day
Inclination5.8175°
200.22°
161.64°
Physical characteristics
Mean diameter
11.42 km (calculated)[3]
15.256±0.211 km[5][6]
8.086±0.0032 h[7]
0.057 (assumed)[3]
0.076±0.017[5][6]
C (assumed)[3]
12.5[6]
12.8[2]
12.990±0.008 (R)[7]
13.44[3]

    Orbit and classification

    GAISH 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 2.8–3.4 AU once every 5 years and 6 months (2,016 days; semi-major axis of 3.12 AU). Its orbit has an eccentricity of 0.09 and an inclination of 6° with respect to the ecliptic.[2] The body's observation arc begins with its official discovery observation in October 1969.[1]

    Physical characteristics

    GAISH is an assumed carbonaceous C-type asteroid.[3]

    Rotation period

    In October 2010, a rotational lightcurve of GAISH was obtained from photometric observations in the R-band by astronomers at the Palomar Transient Factory in California. Lightcurve analysis gave a rotation period of 8.086 hours with a high brightness amplitude of 0.82 magnitude, indicative of a non-spherical shape (U=2).[3][7]

    Diameter and albedo

    According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, GAISH measures 15.256 kilometers in diameter and its surface has an albedo of 0.076.[5][6] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 11.42 kilometers based on an absolute magnitude of 13.44.[3]

    Naming

    This minor planet was named after the Sternberg Astronomical Institute (GAISh, ГАИШ), a division of Moscow State University. Founded in 1931, it is one of Russia's leading astronomical institute and a principal educational facility for professional astronomers. The institute is located on the site of the 1931-built Sternberg Observatory.[1] The official naming citation was published by the Minor Planet Center on 6 January 2007 (M.P.C. 58595).[8]

    References
    1. "14789 GAISH (1969 TY1)". Minor Planet Center. Retrieved 14 May 2018.
    2. "JPL Small-Body Database Browser: 14789 GAISH (1969 TY1)" (2017-06-03 last obs.). Jet Propulsion Laboratory. Retrieved 14 May 2018.
    3. "LCDB Data for (14789) GAISH". Asteroid Lightcurve Database (LCDB). Retrieved 14 May 2018.
    4. "Asteroid 14789 GAISH – 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. (catalog)
    7. Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal. 150 (3): 35. arXiv:1504.04041. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75.
    8. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 14 May 2018.

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