Astronomy:431 Nephele
From HandWiki
| Discovery | |
|---|---|
| Discovered by | Auguste Charlois |
| Discovery date | 18 December 1897 |
| Designations | |
| (431) Nephele | |
| Pronunciation | /ˈnɛfəliː/[1] |
| Named after | Nephele |
| 1897 DN | |
| Minor planet category | Main belt (Themis) |
| Adjectives | Nephelean /nɛfɪˈliːən/ |
| Orbital characteristics[2] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 113.52 yr (41462 d) |
| |{{{apsis}}}|helion}} | 3.67837 astronomical unit|AU (550.276 Gm) |
| |{{{apsis}}}|helion}} | 2.61178 AU (390.717 Gm) |
| 3.14507 AU (470.496 Gm) | |
| Eccentricity | 0.16957 |
| Orbital period | 5.58 yr (2037.3 d) |
| Mean anomaly | 230.611° |
| Mean motion | 0° 10m 36.152s / day |
| Inclination | 1.82752° |
| Longitude of ascending node | 117.229° |
| 216.161° | |
| Physical characteristics | |
| Mean diameter | 101.900±0.988 km[2] 94.58±1.03 km |
| Mass | Template:Nwr |
| Mean density | 1.678 ± 0.935/0.54 g/cm3[3] |
| Rotation period | 18.821 h (0.7842 d) |
| Geometric albedo | 0.055±0.005[2] |
| C | |
| Absolute magnitude (H) | 9.12[2] |
431 Nephele is a large Themistian asteroid. It is spectral C-type and is probably composed of carbonaceous material.
It was discovered by Auguste Charlois on 18 December 1897 in Nice.
References
- ↑ Noah Webster (1884) A Practical Dictionary of the English Language
- ↑ 2.0 2.1 2.2 2.3 "431 Nephele (1897 DN)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=431;cad=1.
- ↑ Fienga, A.; Avdellidou, C.; Hanuš, J. (February 2020). "Asteroid masses obtained with INPOP planetary ephemerides". Monthly Notices of the Royal Astronomical Society 492 (1): 589–602. doi:10.1093/mnras/stz3407. https://academic.oup.com/mnras/article/492/1/589/5658701.
External links
- 431 Nephele at AstDyS-2, Asteroids—Dynamic Site
- 431 Nephele at the JPL Small-Body Database
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