3361 Orpheus
Apollo asteroid
From Wikipedia, the free encyclopedia
3361 Orpheus (1982 HR) is an Apollo asteroid that was discovered on 24 April 1982 by Carlos Torres at Cerro El Roble Astronomical Station. Its eccentric orbit crosses those of Mars and Earth, and approaches Venus as well. From 1900 to 2100 it passes closer than 0.2 AU (78 LD; 30 million km; 19 million mi) to Venus, 11; Earth, 33; and Mars, 14 times. It passed by Earth at a distance of about 0.03 AU (12 LD; 4.5 million km; 2.8 million mi) in 1937, 1978, 1982, and 2021, and will do so again in 2025.[1]
| Discovery | |
|---|---|
| Discovered by | Carlos Torres |
| Discovery site | Cerro El Roble |
| Discovery date | 24 April 1982 |
| Designations | |
| (3361) Orpheus | |
| Pronunciation | /ˈɔːrfiːəs, ˈɔːrfjuːs/ |
Named after | Orpheus, a legendary Greek bard and prophet |
| 1982 HR | |
| PHA[1] | |
| Adjectives | Orphean (Orphæan) /ɔːrˈfiːən/[2] |
| Orbital characteristics[1] | |
| Epoch 13 June 2008 (JD 2454630.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 11752 days (32.18 yr) |
| Aphelion | 1.5999 AU (239.34×106 km) |
| Perihelion | 0.81893 AU (122.510×106 km) |
| 1.2094 AU (180.92×106 km) | |
| Eccentricity | 0.32288 |
| 1.33 yr (485.82 d) | |
| 283.408° | |
| 0° 44m 27.636s / day | |
| Inclination | 2.6849° |
| 189.602° | |
| 301.651° | |
| Earth MOID | 0.0139175 AU (2,082,030 km; 1,293,710 mi) |
| Physical characteristics | |
| Dimensions | 0.3 km[1] |
| 0.15 km | |
| 3.532 h (0.1472 d)[1] | |
| 19.03[1] | |
3361 Orpheus is a potentially hazardous asteroid (PHA) because its minimum orbit intersection distance (MOID) is less than 0.05 AU (19 LD; 7.5 million km; 4.6 million mi) and its diameter is greater than 140 metres (460 ft). The Earth-MOID is 0.0139 AU (5.4 LD; 2.08 million km; 1.29 million mi).[1] With an observation arc of 36 years, the orbit is well-determined for the next several hundred years.
The orbital solution includes non-gravitational forces.[1]
Missions
DART · 65803 Didymos · Earth · Sun · 2001 CB21 · 3361 Orpheus
3361 Orpheus had been one of the originally proposed targets for the Near Earth Asteroid Rendezvous (NEAR) mission.
The proposed AIDA mission's spacecraft, Double Asteroid Redirection Test was a fly-by observation of 3361 Orpheus during its trajectory to asteroid 65803 Didymos but later cancelled.[4][clarification needed]
