160 Una - Misplaced Pages

Main-belt asteroid

160 Una
Discovery
A three-dimensional model of 160 Una based on its light curve.
Discovered by	C. H. F. Peters
Discovery date	20 February 1876
Designations
MPC designation	(160) Una
Pronunciation	/ˈjuːnə/
Minor planet category	Main belt
Orbital characteristics
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)
Semi-major axis	2.72802 AU (408.106 Gm)
Eccentricity	0.066257
Orbital period (sidereal)	4.51 yr (1645.8 d)
Average orbital speed	18.01 km/s
Mean anomaly	144.472°
Mean motion	0° 13 7.471 / day
Inclination	3.82512°
Longitude of ascending node	8.60989°
Argument of perihelion	52.8418°
Earth MOID	1.56031 AU (233.419 Gm)
Jupiter MOID	2.30107 AU (344.235 Gm)
T_Jupiter	3.349
Physical characteristics
Dimensions	81.24±2.1 km
Mass	5.6×10 kg (assumed)
Mean density	2.0? g/cm
Equatorial surface gravity	0.0227 m/s
Equatorial escape velocity	0.0429 km/s
Synodic rotation period	11.033 h (0.4597 d) 0.234 d (5.61 h)
Geometric albedo	0.0625±0.003 0.063
Temperature	~170 K
Spectral type	C
Absolute magnitude (H)	9.08, 8.95

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. It is named after a character in Edmund Spenser's epic poem The Faerie Queene (1590). This minor planet is orbiting the Sun at a distance of 2.73 AU with an eccentricity of 0.07. The orbital plane is inclined at an angle of 3.83° to the plane of the ecliptic.

In the Tholen classification system it is categorized as a CX-type, while the Bus asteroid taxonomy system lists it as an Xk asteroid. 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. It has an estimated diameter of about 81 km.

References

Benjamin Smith (1903) The Century Dictionary and Cyclopedia
^ Yeomans, Donald K., "160 Una", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
^ di Martino, M.; et al. (February 1994), "Lightcurves and rotational periods of nine main belt asteroids", Icarus, 107 (2): 269–275, Bibcode:1994Icar..107..269D, doi:10.1006/icar.1994.1022.
"Lightcurves and map data on numbered asteroids N° 1 to 52225". Archived from the original on 27 November 2005. Retrieved 3 November 2008.
"Infrared Astronomical Satellite (IRAS)". Archived from the original on 24 February 2005. Retrieved 24 February 2005.
Asteroid Lightcurve Data File, Updated March 1, 2001
Warner, Brian D. (December 2007), "Initial Results of a Dedicated H-G Project", The Minor Planet Bulletin, 34 (4): 113–119, Bibcode:2007MPBu...34..113W.
"Numbered Minor Planets 1–5000", Discovery Circumstances, IAU Minor Planet center, retrieved 7 April 2013.
DeMeo, Francesca E.; et al. (July 2009), "An extension of the Bus asteroid taxonomy into the near-infrared" (PDF), Icarus, 202 (1): 160–180, Bibcode:2009Icar..202..160D, doi:10.1016/j.icarus.2009.02.005, archived from the original (PDF) on 17 March 2014, retrieved 8 April 2013. See appendix A.

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