_Hippo.png.webp) Modelled shape of Hippo from its lightcurve | |
| Discovery | |
|---|---|
| Discovered by | Auguste Charlois |
| Discovery date | 25 August 1897 |
| Designations | |
| (426) Hippo | |
| Pronunciation | /ˈhɪpoʊ/ |
Named after | Hippo Regius (Ἱππών Hippōn) |
| 1897 DH | |
| Main belt | |
| Adjectives | Hipponian /hɪˈpoʊniən/[1] |
| Orbital characteristics[2] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 112.19 yr (40977 d) |
| Aphelion | 3.1893 AU (477.11 Gm) |
| Perihelion | 2.5893 AU (387.35 Gm) |
| 2.8893 AU (432.23 Gm) | |
| Eccentricity | 0.10384 |
| 4.91 yr (1793.8 d) | |
| 247.692° | |
| 0° 12m 2.484s / day | |
| Inclination | 19.4771° |
| 311.419° | |
| 222.319° | |
| Proper orbital elements[3] | |
Proper semi-major axis | 2.88928 AU |
Proper eccentricity | 0.179526 |
Proper inclination | 20.3798° |
Proper mean motion | 73.2862 deg / yr |
Proper orbital period | 4.91225 yr (1794.199 d) |
Precession of perihelion | 32.8357 arcsec / yr |
Precession of the ascending node | −59.8571 arcsec / yr |
| Physical characteristics | |
| Dimensions | 127.10±3.5 km[2] |
| 34.3 h (1.43 d) | |
| 0.0469±0.003[2] | |
| Temperature | 154-171 K |
| F | |
| 8.42[2] | |
Hippo (minor planet designation: 426 Hippo) is a rather large main-belt asteroid. It was discovered by Auguste Charlois on August 25, 1897, in Nice. In the 22nd century, it will come closer than 6,000,000 km (0.04 AU) to the larger asteroids 65 Cybele and 511 Davida.[2]
Orbital diagram of Hippo
References
- ↑ Bevan & Smith (1875) The Student's Manual of Ancient Geography, p. 584
- 1 2 3 4 5 "JPL Small-Body Database Browser: 426 Hippo (1897 DH)" (2013-06-21 last obs). Jet Propulsion Laboratory. Retrieved 10 May 2016.
- ↑ "AstDyS-2 (426) Hippo Synthetic Proper Orbital Elements". Department of Mathematics, University of Pisa, Italy. Retrieved 9 February 2014.
External links
- 426 Hippo at AstDyS-2, Asteroids—Dynamic Site
- 426 Hippo at the JPL Small-Body Database
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