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/[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)
|{{{apsis}}}|helion}}| 2.90877 astronomical unit|AU (435.146 Gm)
|{{{apsis}}}|helion}}| 2.54727 AU (381.066 Gm)

Semi-major axis

| 2.72802 AU (408.106 Gm)
Eccentricity| 0.066257
Orbital period| 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°

|{{{apsis}}}|helion}}

| 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
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]
Physics| ~170 K

Spectral type

| C[6]
Absolute magnitude (H)| 9.08,[2] 8.95[7]

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.[8] 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 astronomical unit|AU with an eccentricity of 0.07. The orbital plane is inclined at an angle of 3.83° to the plane of the ecliptic.[2]

In the Tholen classification system it is categorized as a CX-type, while the Bus asteroid taxonomy system lists it as an Xk asteroid.[9] 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.[3] It has an estimated diameter of about 81 km.

## References

1. ↑ Benjamin Smith (1903) The Century Dictionary and Cyclopedia
2. ↑ 2.0 2.1 2.2 2.3 2.4 Yeomans, Donald K., "160 Una", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=160, retrieved 12 May 2016.
3. ↑ 3.0 3.1 di Martino, M. et al. (February 1994), "Lightcurves and rotational periods of nine main belt asteroids", Icarus 107 (2): 269–275, doi:10.1006/icar.1994.1022, Bibcode: 1994Icar..107..269D.
4. ↑ "Lightcurves and map data on numbered asteroids N° 1 to 52225". Archived on 2005-11-27. Error: If you specify `|archivedate=`, you must also specify `|archiveurl=`. http://www.astrosurf.com/aude-old/map_files/AstVarMAP01-2003.htm. Retrieved 2008-11-03.
5. ↑ "Infrared Astronomical Satellite (IRAS)". Archived from the original on 2005-02-24. https://web.archive.org/web/20050224095554/http://dorothy.as.arizona.edu/DSN/IRAS/index_iras.html. Retrieved 2005-02-24.
6. ↑ Asteroid Lightcurve Data File, Updated March 1, 2001
7. ↑ 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.
8. ↑ "Numbered Minor Planets 1–5000", Discovery Circumstances (IAU Minor Planet center), https://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html, retrieved 2013-04-07.
9. ↑ DeMeo, Francesca E. et al. (July 2009), "An extension of the Bus asteroid taxonomy into the near-infrared", Icarus 202 (1): 160–180, doi:10.1016/j.icarus.2009.02.005, Bibcode: 2009Icar..202..160D, archived from the original on 2014-03-17, https://web.archive.org/web/20140317200310/https://www.tara.tcd.ie/bitstream/2262/43276/1/PEER_stage2_10.1016/j.icarus.2009.02.005.pdf, retrieved 2013-04-08. See appendix A.

## External links

* 2011-Jan-24 Occultation / (2011 Asteroidal Occultation Results for North America)
* 160 Una at AstDyS-2, Asteroids—Dynamic Site
* Ephemeris * Observation prediction * Orbital info * Proper elements * Observational info
* 160 Una at the JPL Small-Body Database
* Close approach * Discovery * Ephemeris * Orbit diagram * Orbital elements * Physical parameters

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