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160 Una

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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/^[1]
Minor planet category	Main belt
Orbital characteristics^[2]
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)	4.51yr (1645.8d)
Averageorbital speed	18.01 km/s
Mean anomaly	144.472°
Mean motion	0° 13^m 7.471^s / 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	5.6×10¹⁷ kg (assumed)
Meandensity	2.0? g/cm³
Equatorialsurface gravity	0.0227 m/s²
Equatorialescape velocity	0.0429 km/s
Synodic rotation period	11.033 h (0.4597 d)^[2] 0.234 d (5.61 h)^[3]^[4]
Geometric albedo	0.0625±0.003^[2] 0.063^[5]
Temperature	~170K
Spectral type	C^[6]
Absolute magnitude (H)	9.08,^[2] 8.95^[7]

160 Una is a fairly large and dark, primitivemain belt asteroid that was discovered by German-American astronomerC. H. F. Peters on February 20, 1876, inClinton, New York.^[8] It is named after a character inEdmund Spenser's epic poemThe Faerie Queene (1590). This minor planet is orbiting theSun at a distance of2.73 AU with aneccentricity of 0.07. Theorbital plane is inclined at an angle of 3.83° to theplane of the ecliptic.^[2]

In theTholen classification system it is categorized as aCX-type, while the Busasteroid taxonomy system lists it as anXk asteroid.^[9]Photometric observations of this asteroid made at theTorino Observatory in Italy during 1990–1991 were used to determine a synodicrotation period of 5.61 ± 0.01 hours.^[3] It has an estimated diameter of about81 km.

^Benjamin Smith (1903)The Century Dictionary and Cyclopedia
^^a ^b ^c ^d ^eYeomans, Donald K.,"160 Una",JPL Small-Body Database Browser,NASA Jet Propulsion Laboratory, retrieved12 May 2016.
^^a ^bdi 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 fromthe original on 27 November 2005. Retrieved3 November 2008.
^"Infrared Astronomical Satellite (IRAS)". Archived fromthe original on 24 February 2005. Retrieved24 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, retrieved7 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 fromthe original(PDF) on 17 March 2014, retrieved8 April 2013. See appendix A.

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Designation Groups List Moon Meanings of names
Asteroid	Active Aten asteroid Asteroid belt Family Jupiter trojan Near-Earth Spectral types
Distant minor planet	Centaur Neptune trojan Damocloid Trans-Neptunian object Detached Kuiper belt Oort cloud Scattered disc

Other

Authority control databases	JPL SBDB MPC

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