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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2046158849062116 5.0337e-08  
a 3.085484447491445 1.3434e-08 au
q 2.45414531690363 1.573e-07 au
i 17.61645177743294 5.5202e-06 deg
node 311.2292913535898 1.3236e-05 deg
peri 14.22190648742916 1.5842e-05 deg
M 32.24730458599016 9.9397e-06 deg
tp 2458823.173195372136
(2019-Dec-05.67319537)
5.4138e-05 TDB
period 1979.627459895215
5.42
1.2929e-05
3.54e-08
d
yr
n .1818523976319542 1.1876e-09 deg/d
Q 3.71682357807926 1.6183e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2203  
   data-arc span      39785 days (108.93 yr)  
   first obs. used      1911-09-01  
   last obs. used      2020-08-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42906  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:13:48  

Additional Information
 Earth MOID = 1.445 au 
 Jupiter MOID = 1.63047 au 
 T_jup = 3.123 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456057.5 (2012-May-10.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2077660245443705 5.0127e-08  
q 2.442880949049665 1.5721e-07 au
tp 2456846.788597014340
(2014-Jul-08.28859701)
4.9274e-05 TDB
node 311.4132751277319 1.3237e-05 deg
peri 14.67605278360169 1.5786e-05 deg
i 17.62050630705598 5.5234e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2203  
   data-arc span      39785 days (108.93 yr)  
   first obs. used      1911-09-01  
   last obs. used      2020-08-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42906  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:13:48  

Additional Information
 Jupiter MOID = 1.63047 au 
 T_jup = 3.123 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.512681432867871E-15 -7.862918755700199E-15 1.259535951465149E-13 -1.835730519407054E-15 1.282536531274452E-14 -5.453608624594506E-15
q -7.862918755700199E-15 2.471646406127887E-14 -2.870898315684194E-13 5.659603391943293E-15 -3.207409607109301E-14 1.757645614008253E-14
tp 1.259535951465149E-13 -2.870898315684194E-13 2.427959041880419E-9 -2.201919985927739E-12 4.387853032775574E-10 -4.188148281464098E-13
node -1.835730519407054E-15 5.659603391943293E-15 -2.201919985927739E-12 1.752200898696824E-10 -1.669918510454885E-10 1.880004398833774E-11
peri 1.282536531274452E-14 -3.207409607109301E-14 4.387853032775574E-10 -1.669918510454885E-10 2.491979592307982E-10 -1.812536865004033E-11
i -5.453608624594506E-15 1.757645614008253E-14 -4.188148281464098E-13 1.880004398833774E-11 -1.812536865004033E-11 3.050793740625691E-11

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-August); 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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