What is 31 Euphrosyne?
{{Infobox Planet | bgcolour=#FFFFC0 | name=31 Euphrosyne | discoverer=[[James Ferguson (astronomer)|J. Ferguson]] | discovered=September 1, 1854 | alt_names=A907 GP; A918 GB | mp_category=[[Main belt]] | epoch=December 31, 2006 ([[Julian day|JD]] 2454100.5) | semimajor=471.163 [[Giga|G]][[metre|m]] (3.150 [[Astronomical unit|AU]]) | perihelion=364.755 Gm (2.438 AU) | aphelion=577.571 Gm (3.861 AU) | eccentricity=0.226 | period=2041.585 [[day|d]] (5.59 [[Julian year (astronomy)|a]]) | inclination=26.316[[degree (angle)|°]] | asc_node=31.238° | arg_peri=61.996° | mean_anomaly=14.500° | avg_speed=16.57&nbsp;km/[[second|s]] | dimensions=255.9&nbsp;km | mass=~1.69{{e|19}} [[kilogram|kg]] <ref>{{Cite web |url=http://www.ipa.nw.ru/PAGE/DEPFUND/LSBSS/engmasses.htm |title=Values of asteroid masses |access-date=2007-12-20 |archive-date=2011-06-29 |archive-url=https://web.archive.org/web/20110629063459/http://www.ipa.nw.ru/PAGE/DEPFUND/LSBSS/engmasses.htm |url-status=live }}</ref> | density=~1.9&nbsp;g/[[cubic centimetre|cm³]] | surface_grav=~0.0679&nbsp;m/s² | escape_velocity=~0.1319&nbsp;km/s | rotation=0.2305 d (5.531 h) <ref>{{Cite web |url=http://www.psi.edu/pds/archive/lc.html |title=Asteroid Lightcurve Parameters |access-date=2007-12-20 |archive-date=2006-06-14 |archive-url=https://web.archive.org/web/20060614093519/http://www.psi.edu/pds/archive/lc.html }}</ref> | spectral_type=[[C-type asteroid|C]]<ref>{{cite web|url=https://sites.agu.org/|title=AGU - American Geophysical Union|website=AGU|access-date=2019-02-11|archive-date=2019-03-08|archive-url=https://web.archive.org/web/20190308093516/https://sites.agu.org/|url-status=dead}}</ref> | abs_magnitude=6.74 | albedo=0.0543 <ref>{{Cite web |title=Albedos.tab|url=http://www.psi.edu/pds/asteroid/EAR_A_5_DDR_ALBEDOS_V1_1/data/albedos.tab |access-date=2007-12-20 |archive-date=2012-02-05 |archive-url=https://web.archive.org/web/20120205024917/http://sbn.psi.edu/pds/asteroid/EAR_A_5_DDR_ALBEDOS_V1_1/data/albedos.tab |url-status=dead }}</ref> | single_temperature=~159 [[k