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74 Galatea (A862 QA)
Classification: Main-belt Asteroid          SPK-ID: 2000074
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 101 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2358492928127604 2.7384e-08  
a 2.780263372319992 6.5839e-09 au
q 2.124540222125102 7.5204e-08 au
i 4.070702439484298 3.1525e-06 deg
node 197.1434221637815 5.1112e-05 deg
peri 174.5381974491569 5.1668e-05 deg
M 359.6915842984785 8.6145e-06 deg
tp 2459001.950645561290
(2020-Jun-01.45064556)		 4.0521e-05 TDB
period 1693.274367965117
4.64		 6.0147e-06
1.647e-08		 d
yr
n .212605828571437 7.552e-10 deg/d
Q 3.435986522514883 8.1367e-09 au
   Orbit Determination Parameters
   # obs. used (total)      3280  
   data-arc span      57269 days (156.79 yr)  
   first obs. used      1864-01-30  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47727  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:50:51  

Additional Information
 Earth MOID = 1.12477 au 
 Jupiter MOID = 2.03091 au 
 T_jup = 3.289 
[ 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 8.7   n/a MPO492749 IRAS observations used: 9
diameter diameter 118.71 km 2.8 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 9
rotation period rot_per 17.268 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Pilcher, F. (2008) Minor Planet Bull. 35, 135-138.]
[Pilcher, F. (2009) Minor Planet Bull. 36, 133-136.]
geometric albedo albedo 0.0431   0.002 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 9
B-V BV 0.686   0.027 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=2.33, mean=4.63, max.=6.93) deg.
U-B UB 0.320   0.088 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=2.33, mean=4.63, max.=6.93) deg.
Tholen spectral type spec_T C   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)

74 Galatea (A862 QA)          Discovered 1862-Aug-29 by Tempel, E. W. at Marseille
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A862 QA = A908 OC 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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