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331 Etheridgea (A892 GA)
Classification: Main-belt Asteroid          SPK-ID: 2000331
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 44 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09602959001919011 1.1082e-08  
a 3.024600469444609 1.0126e-08 au
q 2.734149326391993 3.2031e-08 au
i 6.036899745296596 1.0028e-06 deg
node 21.86197934162218 1.0075e-05 deg
peri 333.492503870207 2.0155e-05 deg
M 27.7612859851959 1.3294e-05 deg
tp 2459052.337762146557
(2020-Jul-21.83776215)
7.1007e-05 TDB
period 1921.323300933647
5.26
9.6484e-06
2.642e-08
d
yr
n .1873708603986959 9.4093e-10 deg/d
Q 3.315051612497224 1.1098e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3745  
   data-arc span      47103 days (128.96 yr)  
   first obs. used      1892-04-02  
   last obs. used      2021-03-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .41718  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 18:14:23  

Additional Information
 Earth MOID = 1.72985 au 
 Jupiter MOID = 2.12496 au 
 T_jup = 3.230 
[ 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 9.79   n/a E2021B10 IRAS observations used: 11
diameter diameter 74.92 km 2.7 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 11
rotation period rot_per 25.315 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Pilcher, F. (2016) Minor Planet Bull. 43, 135-136.]
geometric albedo albedo 0.0447   0.003 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 11
B-V BV 0.698   0.027 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=4.13, mean=4.77, max.=5.40) deg.
U-B UB 0.298   0.015 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=4.13, mean=4.77, max.=5.40) deg.
Tholen spectral type spec_T CX   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices
SMASSII spectral type spec_B C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

331 Etheridgea (A892 GA)          Discovered 1892-Apr-01 by Charlois, A. at Nice
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A892 GA = 1949 CM 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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