261 Prymno

261 Prymno

Discovery
Discovered by	C. H. F. Peters
Discovery date	31 October 1886
Designations
Alternative designations	n/a
Minor planet category	Main belt
Orbital characteristics
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc	98.79 yr (36082 d)
Aphelion	2.54054 AU (380.059 Gm)
Perihelion	2.12336 AU (317.650 Gm)
Semi-major axis	2.33195 AU (348.855 Gm)
Eccentricity	0.089449
Orbital period (sidereal)	3.56 yr (1300.7 d)
Average orbital speed	19.51 km/s
Mean anomaly	35.7611°
Mean motion	0° 16m 36.386s / day
Inclination	3.63567°
Longitude of ascending node	96.6415°
Argument of perihelion	65.9065°
Earth MOID	1.13358 AU (169.581 Gm)
Jupiter MOID	2.43829 AU (364.763 Gm)
TJupiter	3.562
Physical characteristics
Dimensions	50.93±1.3 km
Mass	unknown
Mean density	unknown
Equatorial surface gravity	unknown
Equatorial escape velocity	unknown
Synodic rotation period	8.002 h (0.3334 d)
Geometric albedo	0.1141±0.006
Temperature	unknown
Spectral type	B
Absolute magnitude (H)	9.44

261 Prymno is a somewhat large Main belt asteroid. It is classified as a B-type asteroid and probably has a primitive composition not unlike common C-type carbonaceous asteroids.

It was discovered by C. H. F. Peters on October 31, 1886 in Clinton, New York and was named after the Greek Oceanid Prymno.

References

• The Asteroid Orbital Elements Database
• Minor Planet Discovery Circumstances
• Asteroid Lightcurve Data File

External links

• 261 Prymno at the JPL Small-Body Database