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JPL Small-Body Database Browser
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74 Galatea
Classification: Main-belt Asteroid          SPK-ID: 2000074
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 97 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2358492879283149 2.7878e-08  
a 2.78026337499176 7.0703e-09 au
q 2.124540237746779 7.6982e-08 au
i 4.070703541577325 3.1928e-06 deg
node 197.1434013894793 5.2783e-05 deg
peri 174.5382204238516 5.335e-05 deg
M 359.6915800714752 9.4931e-06 deg
tp 2459001.950665445260
(2020-Jun-01.45066545)
4.4654e-05 TDB
period 1693.274370405912
4.64
6.4591e-06
1.768e-08
d
yr
n .2126058282649732 8.1099e-10 deg/d
Q 3.43598651223674 8.7378e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3025  
   data-arc span      56914 days (155.82 yr)  
   first obs. used      1864-01-30  
   last obs. used      2019-11-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49207  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:16:27  

Additional Information
 Earth MOID = 1.12477 au 
 Jupiter MOID = 2.03091 au 
 T_jup = 3.289 
[ hide covariance matrix ]
Orbital Elements at Epoch 2454440.5 (2007-Dec-06.0) TDB
Reference: JPL 97 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2400451110076585 2.8068e-08  
q 2.111241173729022 7.7884e-08 au
tp 2453927.356025691717
(2006-Jul-10.85602569)
3.7696e-05 TDB
node 197.3017697735869 5.2654e-05 deg
peri 174.4902438421685 5.3192e-05 deg
i 4.075200225376084 3.2026e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3025  
   data-arc span      56914 days (155.82 yr)  
   first obs. used      1864-01-30  
   last obs. used      2019-11-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49207  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:16:27  

Additional Information
 Jupiter MOID = 2.03091 au 
 T_jup = 3.289 
Orbit Covariance (6×6)
  e q tp node peri i
e 7.878108501265785E-16 -2.180986193167994E-15 -1.326062201324406E-13 -8.39916627071828E-16 -2.997506078140865E-14 2.977087082511016E-17
q -2.180986193167994E-15 6.06599433406906E-15 3.796916695506589E-13 4.11356702856139E-15 8.405856451633513E-14 -3.600664821993842E-17
tp -1.326062201324406E-13 3.796916695506589E-13 1.420978046811986E-9 -1.192900857079744E-11 3.075902142638355E-10 1.528392813639808E-13
node -8.39916627071828E-16 4.11356702856139E-15 -1.192900857079744E-11 2.772473915185445E-9 -2.767064582438616E-9 -1.721159247121126E-11
peri -2.997506078140865E-14 8.405856451633513E-14 3.075902142638355E-10 -2.767064582438616E-9 2.829438371424627E-9 1.720162156142152E-11
i 2.977087082511016E-17 -3.600664821993842E-17 1.528392813639808E-13 -1.721159247121126E-11 1.720162156142152E-11 1.025671163795287E-11

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. 2019-August); 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          Discovered 1862-Aug-29 by Tempel, E. W. at Marseille
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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