Astronomy:4776 Luyi
| Discovery [1] | |
|---|---|
| Discovered by | Harvard University |
| Discovery site | Oak Ridge Obs. |
| Discovery date | 3 November 1975 |
| Designations | |
| (4776) Luyi | |
| Named after | Luyi (Chinese town) [1] |
| 1975 VD · 1982 RD2 1982 UU | |
| Minor planet category | main-belt [1][2] · (inner) background [3] |
| Orbital characteristics [2] | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 42.21 yr (15,418 d) |
| |{{{apsis}}}|helion}} | 2.8529 AU |
| |{{{apsis}}}|helion}} | 1.7765 AU |
| 2.3147 AU | |
| Eccentricity | 0.2325 |
| Orbital period | 3.52 yr (1,286 d) |
| Mean anomaly | 40.564° |
| Mean motion | 0° 16m 47.64s / day |
| Inclination | 5.3929° |
| Longitude of ascending node | 3.2435° |
| 349.13° | |
| Physical characteristics | |
| Mean diameter | 3.645±0.045 km[4] |
| Geometric albedo | 0.305±0.030[4] |
| Absolute magnitude (H) | 14.3[2] |
4776 Luyi, provisional designation 1975 VD, is a bright background asteroid from the inner regions of the asteroid belt, approximately 3.6 kilometers (2.2 miles) in diameter. It was discovered on 3 November 1975, by Harvard astronomers at the Oak Ridge Observatory in Massachusetts , United States. The asteroid was named for the Chinese town of Luyi, birthplace of Laozi who founded Taoism.[1] Luyi is also named after the son of Harvard astronomer Cheng-yuan Shao.[1]
Orbit and classification
Luyi is a non-family asteroid from the main belt's background population.[3] It orbits the Sun in the inner asteroid belt at a distance of 1.8–2.9 AU once every 3 years and 6 months (1,286 days; semi-major axis of 2.31 AU). Its orbit has an eccentricity of 0.23 and an inclination of 5° with respect to the ecliptic.[2] The body's observation arc begins with its first and official discovery observation at Oak Ridge.[1]
Physical characteristics
The asteroid has an absolute magnitude of 14.3.[2] Its spectral type is unknown. Based on its high albedo (see below), Luyi is a bright asteroid of the S-complex. As of 2018, no rotational lightcurve has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown.[2]
Diameter and albedo
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the asteroid measures 3.645 kilometers in diameter and its surface has a high albedo of 0.30.[4]
Naming
This minor planet was named after a town in the eastern Henan province of China that was the birthplace of Laozi, founder of Taoism, because long-time participant in Harvard's minor-planet program, astronomer Cheng-yuan Shao (born 1927), came from that town (also see 1881 Shao). The asteroid is also named after his son, Luyi.[1]
The official naming citation was published by the Minor Planet Center on 21 November 1991 (M.P.C. 19339).[5]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 "4776 Luyi (1975 VD)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=4776.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 "JPL Small-Body Database Browser: 4776 Luyi (1975 VD)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2004776.
- ↑ 3.0 3.1 "Asteroid 4776 Luyi – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. https://newton.spacedys.com/astdys/index.php?pc=1.1.6&n=4776.
- ↑ 4.0 4.1 4.2 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. doi:10.1088/0004-637X/741/2/68. Bibcode: 2011ApJ...741...68M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...68M. Retrieved 9 May 2018.
- ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html.
External links
- Asteroid Lightcurve Database (LCDB), query form (info )
- Dictionary of Minor Planet Names, Google books
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- 4776 Luyi at AstDyS-2, Asteroids—Dynamic Site
- 4776 Luyi at the JPL Small-Body Database
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