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1251 Hedera (1933 BE)
Classification: Main-belt Asteroid          SPK-ID: 2001251
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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1576141722422392 3.3547e-08  
a 2.717387260447155 9.0604e-09 au
q 2.28908851673017 9.4344e-08 au
i 6.04992632298757 3.4974e-06 deg
node 140.6285656362884 3.3611e-05 deg
peri 217.13284096258 3.5451e-05 deg
M 276.4782882944305 1.3089e-05 deg
tp 2459380.096863121178
(2021-Jun-14.59686312)
6.0424e-05 TDB
period 1636.159843147844
4.48
8.183e-06
2.24e-08
d
yr
n .2200274022783667 1.1004e-09 deg/d
Q 3.145686004164139 1.0488e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3181  
   data-arc span      38606 days (105.70 yr)  
   first obs. used      1915-02-05  
   last obs. used      2020-10-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41502  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:20:57  

Additional Information
 Earth MOID = 1.28808 au 
 Jupiter MOID = 2.29971 au 
 T_jup = 3.334 
[ 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 10.8   n/a MPO473780  
diameter diameter 13.239 km 0.150 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 19.9000 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Behrend, R. (2002) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Chiorny, V.G.; Shevchenko, V.G.; Krugly, Yu.N.; Velichko, F.P.; Gaftonyuk, N.M. (2007) Planet. Space Sci. 55, 986-997.]
[Oey, J. (2008) Minor Planet Bull. 35, 132-135.]
[Durech, J.; Hanus, J.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.]
[Durech, J.; Hanus, J.; Broz, M.; Lehky, M.; et al. (2017) Icarus 304, 101-109.]
geometric albedo albedo 0.636   0.050 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
B-V BV 0.689   0.050 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=12.00, mean=18.10, max.=24.21) deg.
U-B UB 0.233   0.093 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=12.00, mean=18.10, max.=24.21) deg.
Tholen spectral type spec_T E   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo
SMASSII spectral type spec_B X   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)

1251 Hedera (1933 BE)          Discovered 1933-Jan-25 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1933 BE = 1929 CD1 = 1931 TJ2 = 1975 NW1 = A907 GD = A915 CA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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