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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.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 120 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1906206295714911 2.3633e-08  
a 2.57390899899386 3.5496e-09 au
q 2.083268845145924 6.0596e-08 au
i 5.367586493484965 2.7317e-06 deg
node 141.5708197049098 2.8845e-05 deg
peri 358.6591487603098 2.9736e-05 deg
M 112.3804291665006 8.214e-06 deg
tp 2458925.656700085642
(2020-Mar-17.15670009)
3.4155e-05 TDB
period 1508.301660941654
4.13
3.1201e-06
8.542e-09
d
yr
n .2386790449963749 4.9373e-10 deg/d
Q 3.064549152841796 4.2262e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3188  
   data-arc span      64096 days (175.49 yr)  
   first obs. used      1845-12-15  
   last obs. used      2021-06-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5281  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 10:24:41  

Additional Information
 Earth MOID = 1.09706 au 
 Jupiter MOID = 1.9595 au 
 T_jup = 3.396 
[ hide covariance matrix ]
Orbital Elements at Epoch 2452121.5 (2001-Jul-31.0) TDB
Reference: JPL 120 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1927159051329733 2.3936e-08  
q 2.077599172838282 6.161e-08 au
tp 2451379.124138832799
(1999-Jul-19.62413883)
3.2247e-05 TDB
node 141.6903038701455 2.8796e-05 deg
peri 357.6753394950528 2.9639e-05 deg
i 5.368760228834918 2.7358e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3188  
   data-arc span      64096 days (175.49 yr)  
   first obs. used      1845-12-15  
   last obs. used      2021-06-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5281  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 10:24:41  

Additional Information
 Jupiter MOID = 1.9595 au 
 T_jup = 3.396 
Orbit Covariance (6×6)
  e q tp node peri i
e 5.729205905653555E-16 -1.473127541654722E-15 -1.264866260146772E-14 6.03426408520934E-17 3.869579060775002E-15 -4.791172471491067E-18
q -1.473127541654722E-15 3.79580753039192E-15 2.15324067842011E-14 2.86101482821468E-18 -1.182655607118468E-14 1.502613339492931E-17
tp -1.264866260146772E-14 2.15324067842011E-14 1.03989321935249E-9 7.772473673445464E-13 2.342128118586427E-10 2.508859216714319E-13
node 6.03426408520934E-17 2.86101482821468E-18 7.772473673445464E-13 8.292088786623094E-10 -8.253063199814465E-10 6.257621030649115E-12
peri 3.869579060775002E-15 -1.182655607118468E-14 2.342128118586427E-10 -8.253063199814465E-10 8.784865870454345E-10 -6.175064561800578E-12
i -4.791172471491067E-18 1.502613339492931E-17 2.508859216714319E-13 6.257621030649115E-12 -6.175064561800578E-12 7.484358594704325E-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 6.98   n/a MPCxxxxx 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. 2020-October); 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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1914-Nov-24 12:04 < 00:01 Jupiter 1.96232516158369 1.96232497846054 1.96232534470683 2.13628065226544 1.92364509743322 2420461.003074165 0.478057294704437 44.622796495104 13.4347383206465 87.7687008883737 3887454.35805889 T 120 CATAB v2.0g-lin.ifort 2021-Jul-08 10:25:20 2021-Jul-08 10:25
2010-Mar-02 06:21 < 00:01 Jupiter 1.96102499720386 1.96102480266666 1.96102519174107 2.20119367223527 1.99534374445649 2455257.764602793 0.0983992478203423 28.359071306427 10.0031914380133 76.5767719817592 3976274.25398062 T 120 CATAB v2.0g-lin.ifort 2021-Jul-08 10:25:20 2021-Jul-08 10:25
2092-Aug-23 07:36 < 00:01 Jupiter 1.97836001136008 1.97835977425813 1.97836024846203 2.14549945062616 1.93568601669178 2485382.816979425 0.506095045546431 41.6320730275737 13.1978065692048 88.0853306737355 4061921.141749 T 120 CATAB v2.0g-lin.ifort 2021-Jul-08 10:25:20 2021-Jul-08 10:25
2187-Nov-27 19:51 00:01 Jupiter 1.95140072385945 1.95140052269453 1.95140092502447 2.13302868724658 1.91877406945825 2520176.327112046 1.01277242145923 76.40262012754 14.1816666255411 -89.0602334013514 3907010.30890106 T 120 CATAB v2.0g-lin.ifort 2021-Jul-08 10:25:20 2021-Jul-08 10:25

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