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JPL Small-Body Database Browser
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5 Astraea
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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 111 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .191094508984634 2.3785e-08  
a 2.574248918456554 4.0896e-09 au
q 2.082324085379874 6.1014e-08 au
i 5.366988248754509 2.7466e-06 deg
node 141.5766048356492 2.9358e-05 deg
peri 358.6876073473166 3.0274e-05 deg
M 282.3662885068957 8.7777e-06 deg
tp 2458925.828479812444
(2020-Mar-17.32847981)
3.7052e-05 TDB
period 1508.600458228546
4.13
3.5949e-06
9.842e-09
d
yr
n .238631771610838 5.6865e-10 deg/d
Q 3.066173751533235 4.8711e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2926  
   data-arc span      63519 days (173.91 yr)  
   first obs. used      1845-12-15  
   last obs. used      2019-11-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51436  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-03 20:00:15  

Additional Information
 Earth MOID = 1.09589 au 
 Jupiter MOID = 1.9604 au 
 T_jup = 3.396 
[ show covariance matrix ]

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 6.85   n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 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-January); 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          Discovered 1845-Dec-08 by Hencke, K. L. at Driesen
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1969 SE 
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