| Discovery | |
|---|---|
| Discovered by | L. Chernykh |
| Discovery site | Crimean Astrophysical Obs. |
| Discovery date | 8 October 1969 |
| Designations | |
| MPC designation | (14789) GAISH |
| Named after | Sternberg Astronomical Institute (GAISh) (Moscow State University) |
| Alternative designations | 1969 TY1 · 1995 KQ2 1996 QW2 · 1999 CH69 |
| Minor planet category | main-belt · (outer) background |
| Orbital characteristics | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 47.65 yr (17,405 d) |
| Aphelion | 3.4121 AU |
| Perihelion | 2.8333 AU |
| Semi-major axis | 3.1227 AU |
| Eccentricity | 0.0927 |
| Orbital period (sidereal) | 5.52 yr (2,016 d) |
| Mean anomaly | 301.75° |
| Mean motion | 0° 10 42.96 / day |
| Inclination | 5.8175° |
| Longitude of ascending node | 200.22° |
| Argument of perihelion | 161.64° |
| Physical characteristics | |
| Mean diameter | 11.42 km (calculated) 15.256±0.211 km |
| Synodic rotation period | 8.086±0.0032 h |
| Geometric albedo | 0.057 (assumed) 0.076±0.017 |
| Spectral type | C (assumed) |
| Absolute magnitude (H) | 12.5 12.8 12.990±0.008 (R) 13.44 |
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. The assumed C-type asteroid has a rotation period of 8.1 hours and possibly an elongated shape. It was named for the Russian Sternberg Astronomical Institute (GAISh) of Moscow State University.
Orbit and classification
GAISh is a non-family asteroid from the main belt's background population. 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. The body's observation arc begins with its official discovery observation in October 1969.
Physical characteristics
GAISh is an assumed carbonaceous C-type asteroid.
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).
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. 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.
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. The official naming citation was published by the Minor Planet Center on 6 January 2007 (M.P.C. 58595).
References
- ^ "14789 GAISH (1969 TY1)". Minor Planet Center. Retrieved 14 May 2018.
- ^ "JPL Small-Body Database Browser: 14789 GAISH (1969 TY1)" (2017-06-03 last obs.). Jet Propulsion Laboratory. Retrieved 14 May 2018.
- ^ "LCDB Data for (14789) GAISH". Asteroid Lightcurve Database (LCDB). Retrieved 14 May 2018.
- ^ "Asteroid 14789 GAISH – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 29 October 2019.
- ^ 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. S2CID 118745497.
- ^ 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. S2CID 35447010. (catalog)
- ^ 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. S2CID 8342929.
- "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 14 May 2018.
External links
- Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
- Dictionary of Minor Planet Names, Google books
- Discovery Circumstances: Numbered Minor Planets (10001)-(15000) – Minor Planet Center
- 14789 GAISH at AstDyS-2, Asteroids—Dynamic Site
- 14789 GAISH at the JPL Small-Body Database
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