1661 Granule
| Discovery [1] | |
|---|---|
| Discovered by | M. Wolf |
| Discovery site | Heidelberg Obs. |
| Discovery date | 31 March 1916 |
| Designations | |
| MPC designation | 1661 Granule |
Named after |
Edward Gall (pathologist)[2][3] |
|
A916 FA · 1936 PM 1949 QG1 · 1949 SJ 1961 DB | |
| main-belt · Flora [4] | |
| Orbital characteristics [1] | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 99.96 yr (36511 days) |
| Aphelion | 2.3829 AU (356.48 Gm) |
| Perihelion | 1.9852 AU (296.98 Gm) |
| 2.1841 AU (326.74 Gm) | |
| Eccentricity | 0.091039 |
| 3.23 yr (1179.0 d) | |
| 297.96° | |
| 0° 18m 19.26s / day | |
| Inclination | 3.0350° |
| 261.73° | |
| 327.92° | |
| Earth MOID | 0.974564 AU (145.7927 Gm) |
| Jupiter MOID | 2.60243 AU (389.318 Gm) |
| Jupiter Tisserand parameter | 3.671 |
| Physical characteristics | |
| Dimensions | 7.14 km (calculated)[4] |
| 24 h (1.0 d)[1][5] | |
| 0.24 (assumed)[4] | |
| S [4] | |
| 12.9 | |
|
| |
1661 Granule, also designated A916 FA, is a stony asteroid from the inner regions of the asteroid belt, about 7 kilometers in diameter. It was discovered by German astronomer Max Wolf at Heidelberg Observatiry on 31 March 1916.[6]
The asteroid is a member of the Flora family, a large group of stony main-belt asteroids. It orbits the Sun at a distance of 2.0–2.4 AU once every 3 years and 3 months (1,178 days). Its orbit shows an eccentricity of 0.09 and is tilted by 3 degrees to the plane of the ecliptic. It has a relatively long rotation period of 24 hours.[5] The geometric albedo of S-type asteroid is assumed to be about 0.24.[4]
Named in honor of the internationally renowned American pathologist and former director of the University of Cincinnati Academic Health Center and president of USCAP, Edward A. Gall. The minor planet was named on the occasion of his retirement to commemorate his career and his discovery of the Gall's granule, a feature of lymphocytes.[2][3]
References
- 1 2 3 "JPL Small-Body Database Browser: 1661 Granule (A916 FA)" (2015-03-16 last obs.). Jet Propulsion Laboratory. Retrieved 22 April 2016.
- 1 2 Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1661) Granule. Springer Berlin Heidelberg. p. 132. ISBN 978-3-540-29925-7. Retrieved 12 November 2015.
- 1 2 "Past-Presidents – Edward A. Gall". USCAP – The United States and Canadian Academy of Pathology. Retrieved 12 November 2015.
- 1 2 3 4 5 "LCDB Data for (1661) Granule". Asteroid Lightcurve Database (LCDB). Retrieved 12 November 2015.
- 1 2 Behrend, Raoul. "Asteroids and comets rotation curves – (1661) Granule". Geneva Observatory. Retrieved 12 November 2015.
- ↑ "1661 Granule (A916 FA)". Minor Planet Center. Retrieved 12 November 2015.
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
- 1661 Granule at the JPL Small-Body Database
