| Minorplanet: | yes |
| Background: |
|
| Hephaistos | |
| Discoverer: | Lyudmila Chernykh |
| Discovery Site: | Crimean Astrophysical Observatory |
| Discovered: | 27 September 1978 |
| Mpc Name: | (2212) Hephaistos |
| Alt Names: | 1978 SB |
| Named After: | Hephaestus |
| Epoch: | 13 January 2016 (JD 2457400.5) |
| Aphelion: | 3.9674abbr=onNaNabbr=on |
| Perihelion: | 0.35068AU |
| Time Periastron: | 2023-Feb-26 2019-Dec-25 (previous) |
| Semimajor: | 2.159AU |
| Eccentricity: | 0.83757 |
| Period: | 3.17 yr (1158.8 d) |
| Inclination: | 11.558° |
| Asc Node: | 27.569° |
| Mean Anomaly: | 272.08° |
| Arg Peri: | 209.33° |
| Dimensions: | ~6 km |
| Spectral Type: | SG |
| Abs Magnitude: | 13.87 |
| Observation Arc: | 41.13 yr (15022 days) |
| Uncertainty: | 0 |
| Mean Motion: | / day |
| Rotation: | 20abbr=onNaNabbr=on |
| Mean Radius: | 2.85 km |
| Moid: | 0.1161AU |
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 0.048abbr=unitNaNabbr=unit from Mercury on 2032-Sep-16.
Other potential members of the Hephaistos group include (85182) 1991 AQ, 4486 Mithra, and D/1766 G1 (Helfenzrieder).