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409 Aspasia (A895 XC)
Classification: Main-belt Asteroid          SPK-ID: 2000409
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.

Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 105 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07232456785200954 2.9979e-08  
a 2.576120048211813 5.3268e-09 au
q 2.389803278989996 7.7608e-08 au
i 11.26674232056468 3.3699e-06 deg
node 242.1523035205484 1.6252e-05 deg
peri 353.3485929211384 2.81e-05 deg
M 234.5242322216689 2.346e-05 deg
tp 2459526.886732076549
9.8771e-05 TDB
period 1510.245578909962
n .2383718284147102 7.3934e-10 deg/d
Q 2.76243681743363 5.712e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3158  
   data-arc span      45627 days (124.92 yr)  
   first obs. used      1895-12-10  
   last obs. used      2020-11-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45604  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:53:24  

Additional Information
 Earth MOID = 1.37813 au 
 Jupiter MOID = 2.24889 au 
 T_jup = 3.396 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 7.6   n/a MPO502156 IRAS observations used: 12
magnitude slope G 0.29   n/a PDS3 (MPC 17258) Fit
diameter diameter 171.012 km 1.155 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 9.022 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Di Martino, M.; Cacciatori, S. (1984) Astron. Astrophys. 130, 206-207.]
[Zappala, V.; Di Martino, M.; Hanslmeier, A.; Schober, H.J. (1985) Astron. Astrophys. 147, 1, 35-38.]
[Hainaut-Rouelle, M.-C.; Hainaut, O.R.; Detal, A. (1995) Astron. Astrophys. Suppl. Ser. 112, 125-142.]
[Piironen, J.; Lagerkvist, C.-I.; Erikson, A.; Oja, T.; et al. (1998) Astron. Astrophys. Suppl. Ser. 128, 525-540.]
[Behrend, R. (2004) Observatoire de Geneve web site,]
[Lopez-Gonzalez, M.J.; Rodriguez, E. (2005) Planet. Space Sci. 53, 1147-1165.]
[Behrend, R. (2008) Observatoire de Geneve web site,]
[Warner, B.D.; Durech, J.; Faurerbach, M.; Marks, S. (2008) Minor Planet Bull. 35, 167-171.]
[Behrend, R. (2010) Observatoire de Geneve web site,]
[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.]
[Alton, K.B. (2015) Minor Planet Bull. 42, 146-148.]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
[Hanus, J.; Viikinkoski, M.; Marchis, F.; Durech, J.; et al (2017) Astron. Astrophys. 601, A114.]
[Behrend, R. (2018) Observatoire de Geneve web site,]
geometric albedo albedo 0.054   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
B-V BV 0.719   0.018 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=7; phase (min.=4.66, mean=12.04, max.=19.38) deg.
U-B UB 0.323   0.015 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=5; phase (min.=4.66, mean=11.79, max.=19.38) deg.
Tholen spectral type spec_T CX   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices
SMASSII spectral type spec_B Xc   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)

409 Aspasia (A895 XC)          Discovered 1895-Dec-09 by Charlois, A. at Nice
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A895 XC = 1948 RT1 = 1949 CB = A904 AB 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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