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
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° 13m 7.471s / 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)
TJupiter	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
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.^[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

^ ^a ^b ^c ^d Yeomans, Donald K., "160 Una", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
^ ^a ^b di Martino, M.; et al. (February 1994), "Lightcurves and rotational periods of nine main belt asteroids", Icarus, vol. 107, no. 2, pp. 269–275, Bibcode:1994Icar..107..269D, doi:10.1006/icar.1994.1022.
^ "Archived copy". Archived from the original on 27 November 2005. Retrieved 3 November 2008. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)CS1 maint: archived copy as title (link)
^ "Archived copy". Archived from the original on 24 February 2005. Retrieved 24 February 2005. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)CS1 maint: archived copy as title (link)
^ [1]
^ Warner, Brian D. (December 2007), "Initial Results of a Dedicated H-G Project", The Minor Planet Bulletin, vol. 34, pp. 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, vol. 202, no. 1, pp. 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. {{citation}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help) See appendix A.

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