1856 Růžena

1856 Růžena, provisional designation 1969 TW₁, is a stony asteroid from the inner regions of the asteroid belt, approximately 6.6 kilometers in diameter. It was discovered on 8 October 1969, by Russian astronomer Lyudmila Chernykh at Crimean Astrophysical Observatory in Nauchny, on the Crimean peninsula.^[4] The asteroid was named after Růžena Petrovicova, staff member at Kleť Observatory.^[2]

1856 Růžena

Discovery[1]
Discovered by	L. Chernykh
Discovery site	Crimean Astrophysical Obs.
Discovery date	8 October 1969
Designations
MPC designation	(1856) Růžena
Named after	Růžena Petrovicova (Kleť Observatory)[2]
Alternative designations	1969 TW1 · 1941 FP 1971 DL1
Minor planet category	main-belt · (inner)
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	47.47 yr (17,339 days)
Aphelion	2.4146 AU
Perihelion	2.0586 AU
Semi-major axis	2.2366 AU
Eccentricity	0.0796
Orbital period (sidereal)	3.34 yr (1,222 days)
Mean anomaly	251.86°
Mean motion	0° 17m 40.92s / day
Inclination	4.7421°
Longitude of ascending node	185.88°
Argument of perihelion	56.000°
Physical characteristics
Dimensions	6.620±0.252 km[3]
Geometric albedo	0.335±0.033[3]
Spectral type	SMASS = S[1]
Absolute magnitude (H)	12.8[1]

Orbit and classification

Růžena orbits the Sun in the inner main-belt at a distance of 2.1–2.4 AU once every 3 years and 4 months (1,222 days). Its orbit has an eccentricity of 0.08 and an inclination of 5° with respect to the ecliptic.^[1] The asteroid was first identified as 1941 FP at the Finnish Iso-Heikkilä Observatory. The body's observation arc, however, starts with its official discovery observation at Nauchnyj in 1969.^[4]

Physical characteristics

Růžena is bright S-type asteroid in the SMASS classification.^[1]

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Růžena measures 6.62 kilometers in diameter and its surface has an albedo of 0.335.^[3] As of 2016, the body's rotation period and shape remain unknown.^[1][5]

Naming

This asteroid was named in honor of Růžena Petrovicova, observer of comets and minor planets and staff member of the Kleť Observatory, located in what is now the Czech Republic.^[2] The official naming citation was published by the Minor Planet Center on 1 June 1975 (M.P.C. 3825).^[6]