160 Una

{{Short description|Main-belt asteroid}}

{{Use dmy dates|date=September 2018}}

{{Infobox planet

| minorplanet=yes

| background=#D6D6D6

| name=160 Una

| image= 160Una (Lightcurve Inversion).png

| image_scale =

| caption=A three-dimensional model of 160 Una based on its light curve.

| discoverer=C. H. F. Peters

| discovered=20 February 1876

| mpc_name=(160) Una

| alt_names=

| pronounced={{IPAc-en|'|j|uː|n|ə}}Benjamin Smith (1903) The Century Dictionary and Cyclopedia

| mp_category=Main belt

| epoch=31 July 2016 (JD 2457600.5)

| orbit_ref=

| semimajor={{Convert|2.72802|AU|Gm|abbr=on}}

| perihelion={{Convert|2.54727|AU|Gm|abbr=on}}

| aphelion={{Convert|2.90877|AU|Gm|abbr=on|lk=on}}

| eccentricity=0.066257

| period=4.51 yr (1645.8 d)

| inclination=3.82512°

| asc_node=8.60989°

| arg_peri=52.8418°

| mean_anomaly=144.472°

| avg_speed=18.01 km/s

| dimensions={{val|81.24|2.1|ul=km}}

| mass=5.6×10¹⁷ kg (assumed)

| density=2.0? g/cm³

| surface_grav=0.0227 m/s²

| escape_velocity=0.0429 km/s

| rotation={{Convert|11.033|h|d|abbr=on|lk=on}}
0.234 d (5.61 h){{cite web|url=http://www.astrosurf.com/aude-old/map_files/AstVarMAP01-2003.htm |title=Lightcurves and map data on numbered asteroids N° 1 to 52225|accessdate=2008-11-03 |url-status=dead |archive-url=https://web.archive.org/web/20051127063200/http://www.astrosurf.com/aude-old/map_files/AstVarMAP01-2003.htm |archivedate=2005-11-27 }}

| spectral_type=C[http://spiff.rit.edu/richmond/parallax/phot/LCSUMPUB.TXT Asteroid Lightcurve Data File, Updated March 1, 2001]

| abs_magnitude=9.08, 8.95

| albedo={{val|0.0625|0.003}}
0.063{{cite web |url=http://dorothy.as.arizona.edu/DSN/IRAS/index_iras.html |title=Infrared Astronomical Satellite (IRAS)|accessdate=2005-02-24 |url-status=dead |archiveurl=https://web.archive.org/web/20050224095554/http://dorothy.as.arizona.edu/DSN/IRAS/index_iras.html |archivedate=2005-02-24 }}

| single_temperature=~170 K

| mean_motion={{Deg2DMS|0.218742|sup=ms}} / day

| observation_arc=118.30 yr (43209 d)

| uncertainty=0

| moid={{Convert|1.56031|AU|Gm|abbr=on}}

| jupiter_moid={{Convert|2.30107|AU|Gm|abbr=on}}

| tisserand=3.349

}}

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 {{val|2.73|ul=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 {{val|81|u=km}}.