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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 ]

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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.


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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 96 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2364369024460758 2.7972e-08  
a 2.783093828404418 7.3233e-09 au
q 2.125067744399687 7.7289e-08 au
i 4.070962452070505 3.1953e-06 deg
node 197.1968513051811 5.2778e-05 deg
peri 174.3052069112577 5.334e-05 deg
M 274.9099461214046 9.2862e-06 deg
tp 2459001.335794682416
(2020-May-31.83579468)
4.456e-05 TDB
period 1695.86079110439
4.64
6.6936e-06
1.833e-08
d
yr
n .212281575167239 8.3789e-10 deg/d
Q 3.44111991240915 9.0548e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3006  
   data-arc span      56887 days (155.75 yr)  
   first obs. used      1864-01-30  
   last obs. used      2019-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4946  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 01:49:03  

Additional Information
 Earth MOID = 1.12443 au 
 Jupiter MOID = 2.02257 au 
 T_jup = 3.287 
[ hide covariance matrix ]
Orbital Elements at Epoch 2454425.5 (2007-Nov-21.0) TDB
Reference: JPL 96 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2400373039440726 2.81e-08  
q 2.111283252362505 7.7957e-08 au
tp 2453927.356888893816
(2006-Jul-10.85688889)
3.7719e-05 TDB
node 197.3022141453386 5.2677e-05 deg
peri 174.4918100188453 5.3215e-05 deg
i 4.075180049286687 3.2051e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3006  
   data-arc span      56887 days (155.75 yr)  
   first obs. used      1864-01-30  
   last obs. used      2019-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4946  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 01:49:03  

Additional Information
 Jupiter MOID = 2.02257 au 
 T_jup = 3.287 
Orbit Covariance (6×6)
  e q tp node peri i
e 7.89590973362025E-16 -2.185483244373625E-15 -1.313852206904534E-13 -8.512235761806944E-16 -2.981766274049547E-14 3.080364666835506E-17
q -2.185483244373625E-15 6.07737003342894E-15 3.76595629351365E-13 4.157923676123829E-15 8.364006869002086E-14 -3.82709384671443E-17
tp -1.313852206904534E-13 3.76595629351365E-13 1.422703135839232E-9 -1.193013918507432E-11 3.078932954002451E-10 1.561335623992657E-13
node -8.512235761806944E-16 4.157923676123829E-15 -1.193013918507432E-11 2.77483182783643E-9 -2.769416146002099E-9 -1.710334301680352E-11
peri -2.981766274049547E-14 8.364006869002086E-14 3.078932954002451E-10 -2.769416146002099E-9 2.831843091377219E-9 1.709423271181765E-11
i 3.080364666835506E-17 -3.82709384671443E-17 1.561335623992657E-13 -1.710334301680352E-11 1.709423271181765E-11 1.027278097815842E-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-January); 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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