2212 Hephaistos

HephaistosDiscovery

Discovered by| Lyudmila Chernykh
Discovery site| Crimean Astrophysical Observatory
Discovery date| 27 September 1978
Designations

MPC designation

| (2212) Hephaistos
Pronunciation| /hɛˈfeɪstɒs/
Named after| Hephaestus

Alternative designations

| 1978 SB
Orbital characteristics[1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc| 41.13 yr (15022 days)
|{{{apsis}}}|helion}}| 3.9674 astronomical unit|AU (593.51 Gm)
|{{{apsis}}}|helion}}| 0.35068 AU (52.461 Gm)

Semi-major axis

| 2.1590 AU (322.98 Gm)
Eccentricity| 0.83757
Orbital period| 3.17 yr (1158.8 d)
Mean anomaly| 272.08°
Mean motion| 0° 18m 38.412s / day
Inclination| 11.558°
Longitude of ascending node| 27.569°
|{{{apsis}}}|helion}}| 2023-Feb-26
2019-Dec-25 (previous)

|{{{apsis}}}|helion}}

| 209.33°
Earth MOID| 0.11610 AU (17.368 Gm)
Physical characteristics
Dimensions| ~6 km[1]
Mean radius| 2.85 km
Rotation period| 20 h (0.83 d)[1]

Spectral type

| SG[1]
Absolute magnitude (H)| 13.87[1]

2212 Hephaistos (1978 SB) is an Apollo asteroid and a NEO discovered on 27 September 1978 by L. I. Chernykh at the Crimean Astrophysical Observatory. It is named after the Greek god Hephaestus. It is the largest member of the Hephaistos asteroid group. It makes close approaches to all of the inner planets and will pass 0.048 astronomical unit|AU (7.2 million km) from Mercury on 2032-Sep-16.[1]

Other potential members of the Hephaistos group include (85182) 1991 AQ, 4486 Mithra, and D/1766 G1 (Helfenzrieder).[2]

## References

1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 "2212 Hephaistos (1978 SB)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=2212&view=OPC.
2. ↑ Steel, D.; Asher, D. (1994). "P/Helfenzrieder (1766 II) and the Hephaistos group of Earth-crossing asteroids". The Observatory 114: 223–226. Bibcode: 1994Obs...114..223S.

## External links

* 2212 Hephaistos at NeoDyS-2, Near Earth Objects—Dynamic Site
* Ephemeris * Obs prediction * Orbital info * MOID * Proper elements * Obs info * Close * Physical info * NEOCC
* 2212 Hephaistos at ESA–space situational awareness
* Ephemerides * Observations * Orbit * Physical Properties * Summary
* 2212 Hephaistos at the JPL Small-Body Database
* Close approach * Discovery * Ephemeris * Orbit diagram * Orbital elements * Physical parameters

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