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3361 Orpheus
Apollo asteroid
Apollo asteroid
| Field | Value |
|---|---|
| minorplanet | yes |
| background | #FFC2E0 |
| name | 3361 Orpheus |
| discoverer | Carlos Torres |
| discovery_site | Cerro El Roble |
| discovered | 24 April 1982 |
| mpc_name | (3361) Orpheus |
| alt_names | 1982 HR |
| pronounced | |
| adjective | Orphean (Orphæan) |
| named_after | Orpheus, a legendary Greek bard and prophet |
| mp_category | PHA |
| orbit_ref | |
| epoch | 13 June 2008 (JD 2454630.5) |
| aphelion | 1.5999 AU |
| perihelion | 0.81893 AU |
| semimajor | 1.2094 AU |
| eccentricity | 0.32288 |
| period | 1.33 yr (485.82 d) |
| inclination | 2.6849° |
| asc_node | 189.602° |
| mean_anomaly | 283.408° |
| arg_peri | 301.651° |
| dimensions | 0.3 km |
| abs_magnitude | 19.03 |
| mean_motion | / day |
| rotation | 3.532 h |
| mean_radius | 0.15 km |
| observation_arc | 11752 days (32.18 yr) |
| uncertainty | 0 |
| moid | 0.0139175 AU |
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 30 Gm to Venus, 11; Earth, 33; and Mars, 14 times. It passed by Earth at a distance of about 0.03 AU in 1937, 1978, 1982, and 2021, and will do so again in 2025.
3361 Orpheus is a potentially hazardous asteroid (PHA) because its minimum orbit intersection distance (MOID) is less than 0.05 AU and its diameter is greater than 140 m. The Earth-MOID is 0.0139 AU. 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.
| Date | JPL SBDB | |
|---|---|---|
| nominal geocentric | ||
| distance | uncertainty | |
| region | ||
| (3-sigma) | ||
| 2021-11-21 | ± 18 km | |
| 2198-04-16 | ± 129 km |
Missions
trajectory ]] 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.
References
|access-date=20 November 2021}}
|archive-url=https://web.archive.org/web/20221017100944/https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%273361%27&START_TIME=%272198-Apr-16%2021:24%27&STOP_TIME=%272198-Apr-17%27&STEP_SIZE=%271%20day%27&QUANTITIES=%2720,39%27 |archive-date=2022-10-17 |url-status=live
References
- {{OED. Orphean
- (2016). "Asteroid Impact & Deflection Assessment mission: Kinetic impactor". Planetary and Space Science.
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