31 Euphrosyne information

31 Euphrosyne
Discovery
Discovered by	J. Ferguson
Discovery date	September 1, 1854
Designations
MPC designation	(31) Euphrosyne
Pronunciation	/juːˈfrɒsɪniː/
Named after	Εὐφροσύνη Eyphrosynē
Alternative designations	A907 GP; A918 GB
Minor planet category	Main belt
Adjectives	Euphrosynean /juːfrɒsɪˈniːən/
Orbital characteristics
	Epoch April 27, 2019 (JD 2458600.5)
Aphelion	3.8523 AU; (576.296 Gm)
Perihelion	2.4585 AU; (367.786 Gm)
Semi-major axis	3.1554 AU; (472.041 Gm)
Eccentricity	0.2209
Orbital period (sidereal)	5.61 yr (2041.585 d)
Mean anomaly	87.1671°
Inclination	26.3033°
Longitude of ascending node	31.1186°
Argument of perihelion	61.4704°
Known satellites	1
Physical characteristics
Dimensions	c/a = 0.86±0.07; (294±6) × (280±10) × (248±6) km
Mean diameter	268±4 km; 267.1±2.6 km (IRAS); 268±6 km
Mass	(16.5±2.6)×1018 kg; (17±3)×1018 kg
Mean density	1.64±0.27 g/cm3; 1.66±0.24 g/cm3
Synodic rotation period	0.230400 d (5.529595 h)
Geometric albedo	0.05; 0.0543
Spectral type	C
Apparent magnitude	10.16 to 13.61
Absolute magnitude (H)	6.74

Euphrosyne (minor planet designation: 31 Euphrosyne) is a very young asteroid. It is one of the largest asteroids (approximately tied for 7th place, to within measurement uncertainties). It was discovered by James Ferguson on September 1, 1854, the first asteroid found from North America. It is named after Euphrosyne, one of the Charites in Greek mythology. In 2019 a small companion was discovered. It is the third-roundest known asteroid (after 1 Ceres and 10 Hygiea); this is thought to be due to having re-accreted after being disrupted by a collision, and it is not close to hydrostatic equilibrium.^[5]

^ Noah Webster (1884) A Practical Dictionary of the English Language
^ "Elia", The New-England Magazine, vol. IX, Oct. 1835, p. 236
^ ^a ^b ^c ^d Cite error: The named reference jpldata was invoked but never defined (see the help page).
^ ^a ^b ^c ^d ^e P. Vernazza et al. (2021) VLT/SPHERE imaging survey of the largest main-belt asteroids: Final results and synthesis. Astronomy & Astrophysics 54, A56
^ ^a ^b ^c ^d ^e ^f Cite error: The named reference Yang2020 was invoked but never defined (see the help page).
^ "Albedo table". Archived from the original on 22 July 2012. Retrieved 27 December 2006.
^ "Astrometric and Geodetic Properties of Earth and the Solar System" (PDF). Archived from the original (PDF) on 7 July 2009. Retrieved 6 August 2007.
^ "Bright Minor Planets 2000". Minor Planet Center. Retrieved 23 May 2008.^{[permanent dead link]}

[1] Noah Webster (1884) A Practical Dictionary of the English Language

[2] "Elia", The New-England Magazine, vol. IX, Oct. 1835, p. 236

[jpldata-3] Cite error: The named reference jpldata was invoked but never defined (see the help page).

[VLT-4] P. Vernazza et al. (2021) VLT/SPHERE imaging survey of the largest main-belt asteroids: Final results and synthesis. Astronomy & Astrophysics 54, A56

[Yang2020-5] ^ ^a ^b ^c ^d ^e ^f Cite error: The named reference Yang2020 was invoked but never defined (see the help page).

[6] "Albedo table". Archived from the original on 22 July 2012. Retrieved 27 December 2006.

[7] "Astrometric and Geodetic Properties of Earth and the Solar System" (PDF). Archived from the original (PDF) on 7 July 2009. Retrieved 6 August 2007.

[8] "Bright Minor Planets 2000". Minor Planet Center. Retrieved 23 May 2008.^{[permanent dead link]}

31 Euphrosyne information

and 21 Related for: 31 Euphrosyne information

31 Euphrosyne

31

Euphrosyne

List of exceptional asteroids

List of Solar System objects by size

65 Cybele

Mersenne prime

Euphrosyne of Kiev

Planet

264 Libussa

Asteroid family

177 Irma

Elisabeth of Cieszyn

Jan of Cieszyn

30 Urania

895 Helio

Siemowit of Cieszyn

32 Pomona

200 Dynamene

154 Bertha

137 Meliboea