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5 Astraea (A845 XA)
Classification: Main-belt Asteroid          SPK-ID: 2000005
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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 114 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1909133441041888 2.3737e-08  
a 2.574037280352932 3.9709e-09 au
q 2.082619215311902 6.0924e-08 au
i 5.367427135741621 2.7408e-06 deg
node 141.5710264957903 2.8949e-05 deg
peri 358.6484180421261 2.9842e-05 deg
M 17.84634261488834 8.3038e-06 deg
tp 2458925.723109549499
(2020-Mar-17.22310955)
3.4743e-05 TDB
period 1508.414420987454
4.13
3.4905e-06
9.556e-09
d
yr
n .2386612027776379 5.5227e-10 deg/d
Q 3.065455345393962 4.729e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3034  
   data-arc span      63685 days (174.36 yr)  
   first obs. used      1845-12-15  
   last obs. used      2020-04-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52191  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 00:55:47  

Additional Information
 Earth MOID = 1.09575 au 
 Jupiter MOID = 1.95968 au 
 T_jup = 3.396 
[ hide covariance matrix ]
Orbital Elements at Epoch 2452058.5 (2001-May-29.0) TDB
Reference: JPL 114 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1926481945158232 2.4035e-08  
q 2.077891466334788 6.1841e-08 au
tp 2451379.067107796407
(1999-Jul-19.56710780)
3.2489e-05 TDB
node 141.6906088617632 2.8898e-05 deg
peri 357.6765035711989 2.9748e-05 deg
i 5.36857652897516 2.7448e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3034  
   data-arc span      63685 days (174.36 yr)  
   first obs. used      1845-12-15  
   last obs. used      2020-04-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52191  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 00:55:47  

Additional Information
 Jupiter MOID = 1.95968 au 
 T_jup = 3.396 
Orbit Covariance (6×6)
  e q tp node peri i
e 5.776791426377447E-16 -1.484547873599641E-15 -1.507397460886462E-14 -7.761347768897604E-17 3.817709940676096E-15 2.955316107623406E-18
q -1.484547873599641E-15 3.824312349911569E-15 2.698225267134197E-14 3.264925035923751E-16 -1.173993507007403E-14 -1.360250017225015E-18
tp -1.507397460886462E-14 2.698225267134197E-14 1.055506825726272E-9 8.608350782453373E-13 2.372296654679227E-10 2.487926332151069E-13
node -7.761347768897604E-17 3.264925035923751E-16 8.608350782453373E-13 8.351026595940147E-10 -8.311612974852503E-10 6.22018972180645E-12
peri 3.817709940676096E-15 -1.173993507007403E-14 2.372296654679227E-10 -8.311612974852503E-10 8.849454231258514E-10 -6.137756969217006E-12
i 2.955316107623406E-18 -1.360250017225015E-18 2.487926332151069E-13 6.22018972180645E-12 -6.137756969217006E-12 7.534062604217301E-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 6.9   n/a MPO502153 IRAS observations used: 9
diameter diameter 106.699 km 3.140 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 16.806 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Chang, Y.C.; Chang, C.-s. (1962) Acta Astron. Sin. 10, 101-111.]
[Taylor, R.C. (1978) Astron. J. 83, 201-204.]
[Lagerkvist, C.I.; Magnusson, P.; Williams, I.P.; Buontempo, M.E.; et al. (1989) Astron. Astrophys. Suppl. Ser. 78, 519-532.]
[Erikson, A.; Magnusson, P. (1993) Icarus 103, 62-66.]
[De Angelis, G. (1995) Planet. Space Sci. 43, 649-682.]
[Riccioli, D.; Blanco, C.; Cigna, M. (2001) Planet. Space Sci. 49, 657-671.]
[Shevchenko, V.G.; Bel'skaya, I.N.; Krugly, Yu.N.; Chiorny, V.G.; Gaftonyuk, N.M. (2002) Icarus 155, 365-374.]
[Lopez-Gonzalez, M.J.; Rodriguez, E. (2005) Planet. Space Sci. 53, 1147-1165.]
[Higley, S.; Hardersen, P.; Dyvig, R. (2008) Minor Planet Bull. 35, 63-66.]
[Durech, J.; Kaasalainen, M.; Warner, B.D.; Fauerbach, M.; et al. (2009) Astron. Astrophys. 493, 291-297.]
[Durech, J.; Kaasalainen, M.; Herald, D.; Dunham, D.; et al. (2011) Icarus 214, 652-670.]
[Hanus, J.; Marchis, F.; Durech, J. (2013) Icarus 226, 1045-1057.]
[Hanus, J.; Viikinkoski, M.; Marchis, F.; Durech, J.; et al (2017) Astron. Astrophys. 601, A114.]
geometric albedo albedo 0.274   0.033 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.826   0.013 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=10; phase (min.=10.69, mean=16.26, max.=24.05) deg.
U-B UB 0.411   0.034 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=10; phase (min.=10.69, mean=16.26, max.=24.05) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B S   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)

5 Astraea (A845 XA)          Discovered 1845-Dec-08 by Hencke, K. L. at Driesen
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 A845 XA = 1969 SE 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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