160 Una
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A three-dimensional model of 160 Una based on its light curve. | |
| Discovery | |
|---|---|
| Discovered by | C. H. F. Peters |
| Discovery date | February 20, 1876 |
| Designations | |
| Main belt | |
| Orbital characteristics[1] | |
| Epoch January 30, 2005 (JD 2453400.5) | |
| Aphelion | 435.556 Gm (2.912 AU) |
| Perihelion | 380.561 Gm (2.544 AU) |
| 408.058 Gm (2.728 AU) | |
| Eccentricity | 0.067 |
| 1645.485 d (4.51 a) | |
Average orbital speed | 18.01 km/s |
| 308.565° | |
| Inclination | 3.824° |
| 8.856° | |
| 49.974° | |
| Physical characteristics | |
| Dimensions | 81.2 km |
| Mass | 5.6×1017 kg (assumed) |
Mean density | 2.0? g/cm³ |
| 0.0227 m/s² | |
| 0.0429 km/s | |
| 0.234 d (5.61[2] h) 1 | |
| Albedo | 0.063 3 |
| Temperature | ~170 K |
Spectral type | C 2 |
| 8.95[3] | |
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160 Una is a fairly large and dark, primitive Main belt asteroid that was discovered by German-American astronomer C. H. F. Peters on February 20, 1876, in Clinton, New York.[4] It is named after a character in Edmund Spenser's epic poem The Faerie Queene (1590).
In the Tholen classification system it is categorized as a CX-type, while the Bus asteroid taxonomy system lists it as an Xk asteroid.[5] Photometric observations of this asteroid made at the Torino Observatory in Italy during 1990–1991 were used to determine a synodic rotation period of 5.61 ± 0.01 hours.[2]
References
- ↑ Yeomans, Donald K., "160 Una", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), retrieved 2013-03-25.
- 1 2 di Martino, M.; et al. (February 1994), "Lightcurves and rotational periods of nine main belt asteroids", Icarus 107 (2), pp. 269–275, Bibcode:1994Icar..107..269D, doi:10.1006/icar.1994.1022.
- ↑ Warner, Brian D. (December 2007), "Initial Results of a Dedicated H-G Project", Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers 34, pp. 113–119, Bibcode:2007MPBu...34..113W.
- ↑ "Numbered Minor Planets 1–5000", Discovery Circumstances (IAU Minor Planet center), retrieved 2013-04-07.
- ↑ DeMeo, Francesca E.; et al. (July 2009), "An extension of the Bus asteroid taxonomy into the near-infrared" (PDF), Icarus 202 (1), pp. 160–180, Bibcode:2009Icar..202..160D, doi:10.1016/j.icarus.2009.02.005, retrieved 2013-04-08. See appendix A.
External links
- Orbital simulation from JPL (Java) / Ephemeris
- 2011-Jan-24 Occultation / (2011 Asteroidal Occultation Results for North America)
- 160 Una at the JPL Small-Body Database
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