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446 Aeternitas (A899 UB)
Classification: Main-belt Asteroid          SPK-ID: 2000446
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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 92 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .125715502178669 1.4106e-08  
a 2.787009878134846 5.4999e-09 au
q 2.436639531728213 4.0256e-08 au
i 10.61620141088088 3.4004e-07 deg
node 42.038945377971 1.5587e-06 deg
peri 278.9533491057396 9.1976e-06 deg
M 104.4555000611662 7.3093e-06 deg
tp 2458903.400002160771
3.4666e-05 TDB
period 1699.441380474692
n .211834314578973 6.2706e-10 deg/d
Q 3.13738022454148 6.1914e-09 au
  Orbit Determination Parameters
   # obs. used (total)      4097  
   data-arc span      44479 days (121.78 yr)  
   first obs. used      1899-10-29  
   last obs. used      2021-08-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .37021  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 14:38:26  

Additional Information
 Earth MOID = 1.45208 au 
 Jupiter MOID = 2.22201 au 
 T_jup = 3.294 
[ 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 8.80   n/a E2021B10 IRAS observations used: 17
diameter diameter 53.562 km 0.595 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 15.7413 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Florczak, M.; Dotto, E.; Barucci, M.A.; Birlan, M.; et al. (1997) Planet. Space Sci. 45, 1423-1435.]
[Behrend, R. (2006) Observatoire de Geneve web site,]
[Fauerbach, M.; Marks, S.A.; Lucas, M.P. (2008) Minor Planet Bull. 35, 44-46.]
[Lucas, M.P.; Ryan, J.; Fauerbach, M.; Grasso, S. (2011) Minor Planet Bull. 38, 218-220.]
[Lucas, M.P.; Ryan, J.G.; Fauerbach, M. (2012) Minor Planet Bull. 39, 173-176.]
[Klinglesmith III, D.A.; Hanowell, J.; Warren, C.A. (2014) Minor Planet Bull. 41, 206-208.]
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.317   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
B-V BV 1.026   0.022 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=3.62, mean=7.30, max.=14.52) deg.
U-B UB 0.615   0.024 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=3.62, mean=7.30, max.=14.52) deg.
Tholen spectral type spec_T A   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices
SMASSII spectral type spec_B A   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)

446 Aeternitas (A899 UB)          Discovered 1899-Oct-27 by Wolf, M. and Schwassmann, A. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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