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306 Unitas (A891 EA)
Classification: Main-belt Asteroid          SPK-ID: 2000306
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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1507554092705097 3.7712e-08  
a 2.358243601735351 2.8819e-09 au
q 2.002725622396178 8.8787e-08 au
i 7.277364717918906 4.3338e-06 deg
node 141.8605944021463 3.392e-05 deg
peri 167.8835156779278 3.7206e-05 deg
M 110.23189976494 1.6452e-05 deg
tp 2458595.470910652557
(2019-Apr-21.97091065)
6.0305e-05 TDB
period 1322.761128820311
3.62
2.4247e-06
6.638e-09
d
yr
n .2721579823872371 4.9889e-10 deg/d
Q 2.713761581074525 3.3164e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2955  
   data-arc span      47350 days (129.64 yr)  
   first obs. used      1891-03-12  
   last obs. used      2020-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49244  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:31:05  

Additional Information
 Earth MOID = .989031 au 
 Jupiter MOID = 2.5463 au 
 T_jup = 3.527 
[ 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 8.8   n/a MPO492752 IRAS observations used: 32
diameter diameter 47.200 km 0.130 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 8.736 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Harris, A.W.; Young, J.W. (1983) Icarus 54, 59-109.]
[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.]
[Koff, R.A. (2004) Minor Planet Bull. 31, 58-60.]
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Durech, J. (2006) IAU 2006, poster paper.]
[Durech, J.; Kaasalainen, M.; Herald, D.; Dunham, D.; et al. (2011) Icarus 214, 652-670.]
[Behrend, R. (2015) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2018) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.201   0.013 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.864   0.031 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=6.89, mean=11.82, max.=22.56) deg.
U-B UB 0.453   0.016 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=6.89, mean=11.82, max.=22.56) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices
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)

306 Unitas (A891 EA)          Discovered 1891-Mar-01 by Millosevich, E. at Rome
Reference: DISCOVERY.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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