(12538) 1998 OH
(12538) 1998 OH is a stony asteroid, classified as near-Earth object and potentially hazardous asteroid of the Apollo group, approximately 1.8 kilometers (1.1 miles) in diameter. It was discovered on 19 July 1998, by astronomers of the Near-Earth Asteroid Tracking program at the Haleakala Observatory in Hawaii, United States.[2] In 2019, the asteroid came within about 73 lunar distances of Earth.
| Discovery[1] | |
|---|---|
| Discovered by | NEAT |
| Discovery site | Haleakala Obs. |
| Discovery date | 19 July 1998 |
| Designations | |
| (12538) 1998 OH | |
| 1998 OH | |
| NEO · Apollo · PHA[1][2] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 25.96 yr (9,483 days) |
| Aphelion | 2.1674 AU |
| Perihelion | 0.9155 AU |
| 1.5414 AU | |
| Eccentricity | 0.4061 |
| 1.91 yr (699 days) | |
| 58.305° | |
| 0° 30m 54s / day | |
| Inclination | 24.529° |
| 220.75° | |
| 321.72° | |
| Earth MOID | 0.0280 AU · 10.9 LD |
| Physical characteristics | |
| Dimensions | 1.663±0.329 km[3][4] 2.06 km (calculated)[5] |
| 2.58±0.001 h[6] 2.582±0.001 h[6] 5.088±0.004 h[7] 5.154 h[5] 5.191±0.002 h[8] 5.833±0.005 h[9] | |
| 0.20 (assumed)[5] 0.232±0.116[3][4] | |
| SMASS = S:[1] · S[5] | |
| 15.8[1][5] · 16.1[4] | |
Numbering and naming edit
This minor planet was numbered by the Minor Planet Center on 23 November 1999.[10] As of 2018, it has not been named.[2]
Orbit and classification edit
1998 OH is a member of the Apollo group of asteroids, which are Earth-crossing asteroids. They are the largest group of near-Earth objects with approximately 10 thousand known members.
It orbits the Sun at a distance of 0.9–2.2 AU in 1 year and 11 months (699 days). Its orbit has an eccentricity of 0.41 and an inclination of 25° with respect to the ecliptic.[1] The body's observation arc begins with a precovery taken at Palomar Observatory in October 1991, more than 7 years prior to its official discovery observation at Haleakala.[2]
Close approaches edit
The asteroid has an Earth minimum orbital intersection distance of 0.0280 AU (4,190,000 km; 2,600,000 mi), which corresponds to 10.9 lunar distances and makes it a potentially hazardous asteroid due to its sufficiently large size.[1] It will pass close to Earth in 2042 and 2132, at a distance of 0.0292 AU and 0.0317 AU, respectively.[1]
Physical characteristics edit
In the SMASS classification, 1998 OH is a common stony S-type asteroid.[1]
Rotation period edit
In 2014, several rotational lightcurves of 1998 OH were obtained from photometric observations by American astronomer Brian Warner at the Palmer Divide Station in California, by the Spanish amateur astronomer group OBAS, and by astronomers of the EURONEAR lightcurve NEO survey. Lightcurve analysis gave a rotation period of 5.154 hours with an alternative period solution of 2.58 hours, or half the period. The asteroid's brightness amplitude is rather low with a maximum between 0.11 and 0.20 magnitude, which is indicative for a spherical rather than elongated shape (U=3/3/2-/3/2/2).[5][6][7][8][9][a][b]
Diameter and albedo edit
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, 1998 OH measures 1.663 kilometers in diameter and its surface has an albedo of 0.232.[3][4] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 2.06 kilometers based on an absolute magnitude of 15.8.[5]
See also edit
Notes edit
- ^ Lightcurve plot of (12538) by Brian Warner (2014) at the Center for Solar System Studies (CS3), with rotation period 5.833±0.005 hours with a brightness amplitude of 0.12±0.02 mag. Quality Code of 2. Summary figures for (12538) at LCDB
- ^ Lightcurve plot of (12538) by Brian Warner (2016) at the Center for Solar System Studies (CS3), with rotation period 5.154±0.002 hours with a brightness amplitude of 0.20 mag. Quality Code of 3. Summary figures for (12538) at LCDB
References edit
- ^ a b c d e f g h i "JPL Small-Body Database Browser: 12538 (1998 OH)" (2017-09-26 last obs.). Jet Propulsion Laboratory. Retrieved 31 October 2017.
- ^ a b c d "12538 (1998 OH)". Minor Planet Center. Retrieved 31 October 2017.
- ^ a b c Mainzer, A.; Grav, T.; Bauer, J.; Masiero, J.; McMillan, R. S.; Cutri, R. M.; et al. (December 2011). "NEOWISE Observations of Near-Earth Objects: Preliminary Results". The Astrophysical Journal. 743 (2): 17. arXiv:1109.6400. Bibcode:2011ApJ...743..156M. doi:10.1088/0004-637X/743/2/156.
- ^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90.
- ^ a b c d e f g "LCDB Data for (12538)". Asteroid Lightcurve Database (LCDB). Retrieved 31 October 2017.
- ^ a b c Vaduvescu, O.; Macias, A. Aznar; Tudor, V.; Predatu, M.; Galád, A.; Gajdos, S.; et al. (August 2017). "The EURONEAR Lightcurve Survey of Near Earth Asteroids". Earth. 120 (2): 41–100. Bibcode:2017EM&P..120...41V. doi:10.1007/s11038-017-9506-9. hdl:10316/80202.
- ^ a b Lozano, Juan; Flores, Angel; Mas, Vicente; Fornas, Gonzalo; Rodrigo, Onofre; Brines, Pedro; et al. (April 2017). "Seven Near-Earth Asteroids at Asteroids Observers (OBAS) - MPPD: 2016 June-November". The Minor Planet Bulletin. 44 (2): 108–111. Bibcode:2017MPBu...44..108L. ISSN 1052-8091.
- ^ a b Warner, Brian D. (April 2017). "Near-Earth Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2016 October-December". The Minor Planet Bulletin. 44 (2): 98–107. Bibcode:2017MPBu...44...98W. ISSN 1052-8091.
- ^ a b Warner, Brian D. (April 2015). "Near-Earth Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2014 October-December". The Minor Planet Bulletin. 42 (2): 115–127. Bibcode:2015MPBu...42..115W. ISSN 1052-8091.
- ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 24 February 2018.
External links edit
- at the EARN Near-Earth Asteroids Data Base
- Asteroid Lightcurve Database (LCDB), query form (info 16 December 2017 at the Wayback Machine)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- (12538) 1998 OH at NeoDyS-2, Near Earth Objects—Dynamic Site
- Ephemerides · Observation prediction · Orbital info · MOID · Proper elements · Observational info · Close approaches · Physical info · Orbit animation
- (12538) 1998 OH at ESA–space situational awareness
- Ephemerides · Observations · Orbit · Physical properties · Summary
- (12538) 1998 OH at the JPL Small-Body Database