(160) Una

Discovery A three-dimensional model of 160 Una based on its light curve. C. H. F. Peters 20 February 1876 (160) Una /ˈjuːnə/[1] Main belt Epoch 31 July 2016 (JD 2457600.5) Uncertainty parameter 0 118.30 yr (43209 d) 2.90877 AU (435.146 Gm) 2.54727 AU (381.066 Gm) 2.72802 AU (408.106 Gm) 0.066257 4.51 yr (1645.8 d) 18.01 km/s 144.472° 0° 13m 7.471s / day 3.82512° 8.60989° 52.8418° 1.56031 AU (233.419 Gm) 2.30107 AU (344.235 Gm) 3.349 81.24±2.1 km 5.6×1017 kg (assumed) 2.0? g/cm3 0.0227 m/s2 0.0429 km/s 11.033 h (0.4597 d)[2]0.234 d (5.61 h)[3][4] 0.0625±0.003[2]0.063[5] ~170 K C[6] 9.08,[2] 8.95[7] .mw-parser-output .reflist{font-size:90%;margin-bottom:0.5em;list-style-type:decimal}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}

Una (minor planet designation: 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).

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]

References[]

1. ^ Benjamin Smith (1903) The Century Dictionary and Cyclopedia
2. ^ a b c d Yeomans, Donald K., "160 Una", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
3. ^ a b 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.
4. ^ "Lightcurves and map data on numbered asteroids N° 1 to 52225". Archived from the original on 27 November 2005. Retrieved 3 November 2008.
5. ^ "Infrared Astronomical Satellite (IRAS)". Archived from the original on 24 February 2005. Retrieved 24 February 2005.
6. ^
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, retrieved 7 April 2013.
9. ^ 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.