431 Nephele is a large Themistian asteroid. It is spectral C-type and is probably composed of carbonaceous material.

431 Nephele
Discovery
Discovered byAuguste Charlois
Discovery date18 December 1897
Designations
(431) Nephele
Pronunciation/ˈnɛfəl/[1]
Named after
Nephele
1897 DN
Main belt (Themis)
AdjectivesNephelean /nɛfɪˈlən/
Orbital characteristics[2]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc113.52 yr (41462 d)
Aphelion3.67837 AU (550.276 Gm)
Perihelion2.61178 AU (390.717 Gm)
3.14507 AU (470.496 Gm)
Eccentricity0.16957
5.58 yr (2037.3 d)
230.611°
0° 10m 36.152s / day
Inclination1.82752°
117.229°
216.161°
Physical characteristics
101.900±0.988 km[2]
94.58±1.03 km
Mass(7.44 ± 4.14/2.39)×1017 kg[3]
Mean density
1.678 ± 0.935/0.54 g/cm3[3]
18.821 h (0.7842 d)
0.055±0.005[2]
C
9.12[2]

It was discovered by Auguste Charlois on 18 December 1897 in Nice.

References

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  1. ^ Noah Webster (1884) A Practical Dictionary of the English Language
  2. ^ a b c d "431 Nephele (1897 DN)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Archived from the original on 16 September 2020. Retrieved 10 May 2016.
  3. ^ a b 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.
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