160 Una

160 Una

A three-dimensional model of 160 Una based on its light curve.
Discovery
Discovered by C. H. F. Peters
Discovery date 20 February 1876
Designations
Main belt
Orbital characteristics [1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 118.30 yr (43209 d)
Aphelion 2.90877 AU (435.146 Gm)
Perihelion 2.54727 AU (381.066 Gm)
2.72802 AU (408.106 Gm)
Eccentricity 0.066257
4.51 yr (1645.8 d)
18.01 km/s
144.472°
0° 13m 7.471s / day
Inclination 3.82512°
8.60989°
52.8418°
Earth MOID 1.56031 AU (233.419 Gm)
Jupiter MOID 2.30107 AU (344.235 Gm)
Jupiter Tisserand parameter 3.349
Physical characteristics
Dimensions 81.24±2.1 km
Mass 5.6×1017 kg (assumed)
Mean density
 2.0? g/cm³
Equatorial surface gravity
 0.0227 m/s²
Equatorial escape velocity
 0.0429 km/s
11.033 h (0.4597 d) [1]
0.234 d (5.61 h) [2][3]
0.0625±0.003 [1]
0.063 [4]
Temperature ~170 K
C [5]
9.08,[1] 8.95 [6]

    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.[7] 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.[8] 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

    1. 1 2 3 4 Yeomans, Donald K., "160 Una", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
    2. 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.
    3. ↑
    4. ↑
    5. ↑
    6. ↑ Warner, Brian D. (December 2007), "Initial Results of a Dedicated H-G Project", The Minor Planet Bulletin, 34, pp. 113–119, Bibcode:2007MPBu...34..113W.
    7. ↑ "Numbered Minor Planets 1–5000", Discovery Circumstances, IAU Minor Planet center, retrieved 2013-04-07.
    8. ↑ 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, archived from the original (PDF) on 2014-03-17, retrieved 2013-04-08. See appendix A.

    External links


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