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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 | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 81 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1258679872862359 3.7161e-08  
a 2.786568770507148 8.7048e-09 au
q 2.435828967928732 1.0652e-07 au
i 10.61721940758081 3.6679e-06 deg
node 42.04096623992395 2.046e-05 deg
peri 278.8276838235046 2.5357e-05 deg
M 20.65710712753881 1.6623e-05 deg
tp 2458903.007753864558
(2020-Feb-23.50775386)
7.8207e-05 TDB
period 1699.037933630585
4.65
7.9613e-06
2.18e-08
d
yr
n .2118846159195132 9.9284e-10 deg/d
Q 3.137308573085563 9.8005e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3536  
   data-arc span      44048 days (120.60 yr)  
   first obs. used      1899-10-29  
   last obs. used      2020-06-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .38463  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:14:02  

Additional Information
 Earth MOID = 1.45194 au 
 Jupiter MOID = 2.22355 au 
 T_jup = 3.294 
[ 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 8.7   n/a MPO492754 IRAS observations used: 17
diameter diameter 53.562 km 0.595 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 15.7413 h n/a LCDB (Rev. 2019-August); 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, http://obswww.unige.ch/~behrend/page_cou.html]
[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.]
geometric albedo albedo 0.317   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
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

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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