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285 Regina (A889 PA)
Classification: Main-belt Asteroid          SPK-ID: 2000285
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 46 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2046300363057185 3.9811e-08  
a 3.086076322147802 1.1583e-08 au
q 2.454572412304479 1.2111e-07 au
i 17.61641305945253 4.0887e-06 deg
node 311.228754761773 1.275e-05 deg
peri 14.27962099952591 1.5518e-05 deg
M 68.56404973139232 9.673e-06 deg
tp 2458823.360187315543
(2019-Dec-05.86018732)
5.2376e-05 TDB
period 1980.197101809195
5.42
1.1149e-05
3.052e-08
d
yr
n .1818000842800387 1.0235e-09 deg/d
Q 3.717580231991124 1.3953e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2746  
   data-arc span      39955 days (109.39 yr)  
   first obs. used      1911-09-01  
   last obs. used      2021-01-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39073  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:45:11  

Additional Information
 Earth MOID = 1.44351 au 
 Jupiter MOID = 1.63005 au 
 T_jup = 3.123 
[ 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 10.85   n/a E2021B10  
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. 2020-October); 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 (A889 PA)          Discovered 1889-Aug-03 by Charlois, A. at Nice
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A889 PA = 1951 AC1 = A911 QJ 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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