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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 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1576141766033623 3.3904e-08  
a 2.717387261510959 9.1397e-09 au
q 2.289088505775443 9.5145e-08 au
i 6.049925720404793 3.5428e-06 deg
node 140.6285587187577 3.4133e-05 deg
peri 217.1328482560981 3.5938e-05 deg
M 276.4782871478889 1.3152e-05 deg
tp 2459380.096868554989
(2021-Jun-14.59686856)
6.0729e-05 TDB
period 1636.159844108631
4.48
8.2547e-06
2.26e-08
d
yr
n .2200274021491621 1.1101e-09 deg/d
Q 3.145686017246474 1.058e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3057  
   data-arc span      38534 days (105.50 yr)  
   first obs. used      1915-02-05  
   last obs. used      2020-08-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42112  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:30:45  

Additional Information
 Earth MOID = 1.28808 au 
 Jupiter MOID = 2.29971 au 
 T_jup = 3.334 
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Orbital Elements at Epoch 2456261.5 (2012-Nov-30.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1553208996482657 3.3942e-08  
q 2.296195842612375 9.4805e-08 au
tp 2456112.299075894694
(2012-Jul-03.79907589)
5.5452e-05 TDB
node 140.7257747018993 3.4226e-05 deg
peri 217.9188108720346 3.6087e-05 deg
i 6.039842485773367 3.5371e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3057  
   data-arc span      38534 days (105.50 yr)  
   first obs. used      1915-02-05  
   last obs. used      2020-08-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42112  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:30:45  

Additional Information
 Jupiter MOID = 2.29971 au 
 T_jup = 3.334 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.152039393795047E-15 -3.208239910742409E-15 -1.476146062346691E-13 3.823984765522687E-16 -1.784970863389753E-14 1.191358475147907E-16
q -3.208239910742409E-15 8.987894629919734E-15 4.854379313222867E-13 -3.854109736699447E-16 6.417071712803784E-14 -1.735177309221175E-16
tp -1.476146062346691E-13 4.854379313222867E-13 3.074970952672057E-9 3.460102807553759E-12 6.504305279395676E-10 5.664427520225709E-13
node 3.823984765522687E-16 -3.854109736699447E-16 3.460102807553759E-12 1.171401217208442E-9 -1.1638819510279E-9 5.35468728811919E-12
peri -1.784970863389753E-14 6.417071712803784E-14 6.504305279395676E-10 -1.1638819510279E-9 1.302260005029858E-9 -5.222280129762748E-12
i 1.191358475147907E-16 -1.735177309221175E-16 5.664427520225709E-13 5.35468728811919E-12 -5.222280129762748E-12 1.251078417689739E-11

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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