261 Prymno

261 Prymno

Discovery
Discovered by	C. H. F. Peters
Discovery date	31 October 1886
Designations
Alternative names	n/a
Minor planet category	Main belt
Orbital characteristics[1]
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	3.56 yr (1300.7 d)
Average orbital speed	19.51 km/s
Mean anomaly	35.7611°
Mean motion	0° 16^m 36.386^s / 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)
Jupiter Tisserand parameter	3.562
Physical characteristics
Dimensions	50.93±1.3 km
Mass	unknown
Mean density	unknown
Equatorial surface gravity	unknown
Equatorial escape velocity	unknown
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

1. "261 Prymno". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 11 May 2016.

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

External links

• 261 Prymno at the JPL Small-Body Database
  
  • Discovery · Orbit diagram · Orbital elements · Physical parameters