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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 | 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 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09602959029211493 1.1082e-08  
a 3.024600472893509 1.0127e-08 au
q 2.734149328684208 3.2032e-08 au
i 6.036899730805942 1.0028e-06 deg
node 21.86197931114794 1.0075e-05 deg
peri 333.4925039274889 2.0156e-05 deg
M 27.76128560592311 1.3294e-05 deg
tp 2459052.337763917319
(2020-Jul-21.83776392)
7.1007e-05 TDB
period 1921.323304219925
5.26
9.6498e-06
2.642e-08
d
yr
n .1873708600782123 9.4106e-10 deg/d
Q 3.315051617102809 1.11e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3736  
   data-arc span      47086 days (128.91 yr)  
   first obs. used      1892-04-02  
   last obs. used      2021-03-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41769  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Mar-16 11:00:46  

Additional Information
 Earth MOID = 1.72985 au 
 Jupiter MOID = 2.12496 au 
 T_jup = 3.230 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456494.5 (2013-Jul-21.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1007836933446407 1.1094e-08  
q 2.71967296032234 3.2338e-08 au
tp 2457129.502591928901
(2015-Apr-17.00259193)
6.7348e-05 TDB
node 22.0543950750075 1.0026e-05 deg
peri 333.3530347096049 1.9327e-05 deg
i 6.053866056135496 1.005e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3736  
   data-arc span      47086 days (128.91 yr)  
   first obs. used      1892-04-02  
   last obs. used      2021-03-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41769  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Mar-16 11:00:46  

Additional Information
 Jupiter MOID = 2.12496 au 
 T_jup = 3.230 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.230844070501661E-16 -3.454542335037866E-16 -7.126855740164774E-14 3.609550941181782E-14 -5.42406885037027E-14 3.864259161218678E-15
q -3.454542335037866E-16 1.045758191003426E-15 8.923239689234682E-14 -1.065361042587867E-13 1.335548967172993E-13 -1.146818891797148E-14
tp -7.126855740164774E-14 8.923239689234682E-14 4.53581188833494E-9 -1.5873773331129E-10 1.131692005704062E-9 4.579403140084865E-12
node 3.609550941181782E-14 -1.065361042587867E-13 -1.5873773331129E-10 1.005259750173249E-10 -1.322552788044994E-10 -2.121310298208327E-12
peri -5.42406885037027E-14 1.335548967172993E-13 1.131692005704062E-9 -1.322552788044994E-10 3.735352907868278E-10 2.653556450493598E-12
i 3.864259161218678E-15 -1.146818891797148E-14 4.579403140084865E-12 -2.121310298208327E-12 2.653556450493598E-12 1.010107576949758E-12

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 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

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