223 Rosa

223 Rosa is a large Themistian asteroid. It is classified as a combination of C-type and P-type asteroids, so it is probably composed of carbonaceous material rich in water ice. It was discovered by Johann Palisa on 9 March 1882, in Vienna. The origin of the name is not known.

223 Rosa

Discovery
Discovered by	Johann Palisa
Discovery date	9 March 1882
Designations
MPC designation	(223) Rosa
Alternative designations	A882 EA, 1887 BA 1942 EL
Minor planet category	Main belt (Themis)
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc	130.29 yr (47590 d)
Aphelion	3.45415 AU (516.733 Gm)
Perihelion	2.73689 AU (409.433 Gm)
Semi-major axis	3.09552 AU (463.083 Gm)
Eccentricity	0.11586
Orbital period (sidereal)	5.45 yr (1989.3 d)
Average orbital speed	16.94 km/s
Mean anomaly	309.511°
Mean motion	0° 10m 51.488s / day
Inclination	1.93552°
Longitude of ascending node	47.9276°
Argument of perihelion	61.7716°
Physical characteristics
Mean diameter	82.7±8.4 km[2]
Mass	(5.979±2.971)×1017 kg[2]
Mean density	1.790±50% g/cm3[2]
Synodic rotation period	20.283 h (0.8451 d)
Geometric albedo	0.0309±0.003
Spectral type	CP
Absolute magnitude (H)	9.68,[1] 9.72[3]

Photometric observations made in 2011–2012 at the Organ Mesa Observatory in Las Cruces, New Mexico, produced a light curve with a period of 20.283 ± 0.002 hours and a brightness variation of 0.13 ± 0.02 in magnitude. The curve has two asymmetrical maxima and minima per 20.283-hour cycle.^[4]

A flyby of Rosa by the JUICE spacecraft, which is planned to pass through the asteroid belt twice, was proposed to occur on 15 October 2029.^[2] However, the mission team ultimately decided against the proposed flyby to maximize fuel for the primary mission.^[5]