431 Nephele

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431 Nephele
Discovery
Discovered by Auguste Charlois
Discovery date18 December 1897
Designations
(431) Nephele
Pronunciation /ˈnɛfəl/ [1]
Named after
Nephele
1897 DN
Main belt (Themis)
Adjectives Nephelean /nɛfɪˈlən/
Orbital characteristics [2]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 113.52 yr (41462 d)
Aphelion 3.67837  AU (550.276  Gm)
Perihelion 2.61178 AU (390.717 Gm)
3.14507 AU (470.496 Gm)
Eccentricity 0.16957
5.58 yr (2037.3 d)
230.611°
0° 10m 36.152s / day
Inclination 1.82752°
117.229°
216.161°
Physical characteristics
Mean diameter
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]

    Nephele (minor planet designation: 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.

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    References

    1. Noah Webster (1884) A Practical Dictionary of the English Language
    2. 1 2 3 4 "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. 1 2 Fienga, A.; Avdellidou, C.; Hanuš, J. (February 2020). "Asteroid masses obtained with INPOP planetary ephemerides". Monthly Notices of the Royal Astronomical Society. 492 (1). doi: 10.1093/mnras/stz3407 .