Astronomy:1218 Aster
_Aster.png) Shape model of Aster from its lightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 29 January 1932 |
| Designations | |
| (1218) Aster | |
| Pronunciation | /ˈæstər/[3] |
| Named after | Aster (genus of flowers)[2] |
| 1932 BJ · 1978 TJ5 1978 VQ12 | |
| Minor planet category | main-belt · (inner) |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 85.35 yr (31,173 days) |
| |{{{apsis}}}|helion}} | 2.5110 AU |
| |{{{apsis}}}|helion}} | 2.0158 AU |
| 2.2634 AU | |
| Eccentricity | 0.1094 |
| Orbital period | 3.41 yr (1,244 days) |
| Mean anomaly | 56.714° |
| Mean motion | 0° 17m 21.84s / day |
| Inclination | 3.1572° |
| Longitude of ascending node | 63.820° |
| 69.372° | |
| Physical characteristics | |
| Dimensions | 5.554±0.084 km[4] |
| Geometric albedo | 0.332±0.043[4] |
| Absolute magnitude (H) | 13.2[1] |
1218 Aster, provisional designation 1932 BJ, is a bright asteroid from the inner regions of the asteroid belt, approximately 5.5 kilometers in diameter. Discovered by Karl Reinmuth in 1932, it was later named after the flowering plant Aster.
Discovery
Aster was discovered on 29 January 1932, by German astronomer Karl Reinmuth at Heidelberg Observatory in southern Germany.[5] Two nights later, it was independently discovered by Italian astronomer Mario A. Ferrero at the Pino Torinese Observatory at Turin, Italy.[2]
Classification and orbit
Aster orbits the Sun in the inner main-belt at a distance of 2.0–2.5 AU once every 3 years and 5 months (1,244 days). Its orbit has an eccentricity of 0.11 and an inclination of 3° with respect to the ecliptic.[1]
The asteroid's observation arc begins at the discovering observatory, one week after its official discovery observation.[5]
Physical characteristics
Diameter and albedo
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Aster measures 5.554 kilometers in diameter and its surface has an albedo of 0.332.[4]
Lightcurves
As of 2017, rotational lightcurve of Aster has been obtained.[6] The body's rotation period, shape and variation in magnitude shifted from unknown movements[1][7] to specific identifiable spin/shape determinations.
Naming
The minor planet was named after the genus of flowers, Aster (also see List of minor planets named after animals and plants § Plants). The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 113).[2]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 "JPL Small-Body Database Browser: 1218 Aster (1932 BJ)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001218. Retrieved 23 July 2017.
- ↑ 2.0 2.1 2.2 Schmadel, Lutz D. (2007). "(1218) Aster". Dictionary of Minor Planet Names – (1218) Aster. Springer Berlin Heidelberg. p. 101. doi:10.1007/978-3-540-29925-7_1219. ISBN 978-3-540-00238-3.
- ↑ "Aster". Merriam-Webster Dictionary. https://www.merriam-webster.com/dictionary/aster.
- ↑ 4.0 4.1 4.2 Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R. et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal 791 (2): 11. doi:10.1088/0004-637X/791/2/121. Bibcode: 2014ApJ...791..121M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014ApJ...791..121M. Retrieved 23 July 2017.
- ↑ 5.0 5.1 "1218 Aster (1932 BJ)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=1218. Retrieved 23 July 2017.
- ↑ Minor Planet Lightcurve Data, Organ Mesa Observatory. "Asteroid Lightcurve Research 1218 Aster Phased Plot". Astronomical Society of Las Cruces (ASLC). http://aslc-nm.org/1218Aster.jpg. Retrieved 1 June 2018.
- ↑ "LCDB Data for (1218) Aster". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1218%7CAster. Retrieved 23 July 2017.
External links
- Asteroid Lightcurve Database (LCDB), query form (info )
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- 1218 Aster at AstDyS-2, Asteroids—Dynamic Site
- 1218 Aster at the JPL Small-Body Database
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