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JPL Small-Body Database Browser
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331 Etheridgea
Classification: Main-belt Asteroid          SPK-ID: 2000331
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 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09613181890425108 3.7309e-08  
a 3.024877384578642 1.2594e-08 au
q 2.734090419636764 1.1228e-07 au
i 6.036706486071688 4.1956e-06 deg
node 21.86304630850412 3.8631e-05 deg
peri 333.4094952137194 4.4039e-05 deg
M 350.3552075714184 2.2378e-05 deg
tp 2459051.981414834130
(2020-Jul-21.48141483)
0.00011956 TDB
period 1921.587165045108
5.26
1.2001e-05
3.286e-08
d
yr
n .1873451314354242 1.17e-09 deg/d
Q 3.315664349520521 1.3805e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3124  
   data-arc span      46607 days (127.60 yr)  
   first obs. used      1892-04-02  
   last obs. used      2019-11-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4474  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-28 17:23:10  

Additional Information
 Earth MOID = 1.73146 au 
 Jupiter MOID = 2.1237 au 
 T_jup = 3.230 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455822.5 (2011-Sep-18.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1016315531146306 3.7509e-08  
q 2.714962913040778 1.1363e-07 au
tp 2455209.400781773968
(2010-Jan-12.90078177)
0.00010672 TDB
node 22.04818426919077 3.8456e-05 deg
peri 333.355537375798 4.3288e-05 deg
i 6.056116911491728 4.2057e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3124  
   data-arc span      46607 days (127.60 yr)  
   first obs. used      1892-04-02  
   last obs. used      2019-11-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4474  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-28 17:23:10  

Additional Information
 Jupiter MOID = 2.1237 au 
 T_jup = 3.230 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.406922849014633E-15 -4.24224467713684E-15 7.197067419008304E-14 3.457389625083572E-15 4.791249841400576E-16 1.454862993866348E-16
q -4.24224467713684E-15 1.291286418584084E-14 -5.169874068693429E-14 -9.776049870366297E-15 3.43910025739676E-14 -2.979792397982953E-16
tp 7.197067419008304E-14 -5.169874068693429E-14 1.138905686334344E-8 -6.243349920356856E-12 2.142942221577261E-9 1.401579306913035E-12
node 3.457389625083572E-15 -9.776049870366297E-15 -6.243349920356856E-12 1.478860060196855E-9 -1.471257107297804E-9 -1.198015898336275E-11
peri 4.791249841400576E-16 3.43910025739676E-14 2.142942221577261E-9 -1.471257107297804E-9 1.873846467370814E-9 1.216070428383346E-11
i 1.454862993866348E-16 -2.979792397982953E-16 1.401579306913035E-12 -1.198015898336275E-11 1.216070428383346E-11 1.768753776578863E-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 9.7   n/a MPO492752 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. 2019-August); 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          Discovered 1892-Apr-01 by Charlois, A. at Nice
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1949 CM 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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