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6157 Prey (1991 RX2)
Classification: Main-belt Asteroid          SPK-ID: 2006157
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.

Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08389103637687953 8.7942e-09  
a 2.427204179581079 8.215e-09 au
q 2.223583505457729 2.0163e-08 au
i 3.963118855157943 3.3846e-07 deg
node 279.9335441942667 8.0088e-06 deg
peri 225.8576341178604 1.347e-05 deg
M 183.1119914285097 1.0497e-05 deg
tp 2460075.162395393530
4.1101e-05 TDB
period 1381.204211154473
n .2606421245263188 1.3232e-09 deg/d
Q 2.63082485370443 8.9041e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2405  
   data-arc span      25764 days (70.54 yr)  
   first obs. used      1950-12-11  
   last obs. used      2021-06-25  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4644  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 00:24:32  

Additional Information
 Earth MOID = 1.23856 au 
 Jupiter MOID = 2.38057 au 
 T_jup = 3.502 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.87   n/a E2021B10  
diameter diameter 3.538 km 0.639 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
geometric albedo albedo 0.512   0.209 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

6157 Prey           Discovered 1991 Sept. 9 by L. D. Schmadel and F. Börngen at Tautenburg.
Named in memory of Adalbert Prey (1873-1949), professor of astronomy in Innsbruck, Prague and, eventually, Vienna, where he was elected to membership in the Austrian Academy of Sciences. After World War II until his death he served as one of the two secretaries of the Academy. He worked on the motion of 70 Oph (sometimes called "Prey's star"), as well as on the dynamics of minor planets and the moon. He thoroughly investigated the field of isostasy and gravitation, to which he devoted a series of papers. Named by the first discoverer following a suggestion by H. Haupt, who also prepared the citation.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 19980211/MPCPages.arcLast Updated: 2009-11-17

Alternate Designations
 1991 RX2 = 1984 WM4 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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