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JPL Small-Body Database Browser
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285 Regina
Classification: Main-belt Asteroid          SPK-ID: 2000285
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2053052202259107 5.1784e-08  
a 3.088057963817975 1.4247e-08 au
q 2.454063543485948 1.6245e-07 au
i 17.60920127511775 5.6345e-06 deg
node 311.2397128936078 1.3316e-05 deg
peri 14.15756967611312 1.5918e-05 deg
M 319.5973244227933 9.925e-06 deg
tp 2458822.950925894527
(2019-Dec-05.45092589)
5.5375e-05 TDB
period 1982.104704154999
5.43
1.3717e-05
3.756e-08
d
yr
n .1816251176062232 1.2569e-09 deg/d
Q 3.722052384150002 1.7172e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2116  
   data-arc span      39507 days (108.16 yr)  
   first obs. used      1911-09-01  
   last obs. used      2019-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43757  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 01:51:41  

Additional Information
 Earth MOID = 1.44401 au 
 Jupiter MOID = 1.62217 au 
 T_jup = 3.122 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 10.7   n/a MPO267706  
diameter diameter 47.156 km 0.310 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 9.542 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Published Reference List:
[Pilcher, F.; Benishek, V. (2010) Minor Planet Bull. 37, 50.]
geometric albedo albedo 0.050   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

285 Regina          Discovered 1889-Aug-03 by Charlois, A. at Nice
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1951 AC1 = A911 QJ 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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