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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.


Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1576141721469449 3.3545e-08  
a 2.71738726043168 9.0588e-09 au
q 2.289088516976086 9.434e-08 au
i 6.049926328660582 3.4972e-06 deg
node 140.6285657528618 3.3603e-05 deg
peri 217.1328408137612 3.5444e-05 deg
M 276.4782883453244 1.3087e-05 deg
tp 2459380.096862886629
(2021-Jun-14.59686289)		 6.0413e-05 TDB
period 1636.159843133868
4.48		 8.1816e-06
2.24e-08		 d
yr
n .2200274022802461 1.1002e-09 deg/d
Q 3.145686003887274 1.0487e-08 au
   Orbit Determination Parameters
   # obs. used (total)      3184  
   data-arc span      38630 days (105.76 yr)  
   first obs. used      1915-02-05  
   last obs. used      2020-11-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41484  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:59:24  

Additional Information
 Earth MOID = 1.28808 au 
 Jupiter MOID = 2.29971 au 
 T_jup = 3.334 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456370.5 (2013-Mar-19.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1556591553002018 3.3578e-08  
q 2.296153566183254 9.4094e-08 au
tp 2456112.522464928140
(2012-Jul-04.02246493)		 5.5234e-05 TDB
node 140.7029883121298 3.3686e-05 deg
peri 217.9963053847878 3.5576e-05 deg
i 6.040209170476407 3.4918e-06 deg
   Orbit Determination Parameters
   # obs. used (total)      3184  
   data-arc span      38630 days (105.76 yr)  
   first obs. used      1915-02-05  
   last obs. used      2020-11-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41484  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:59:24  

Additional Information
 Jupiter MOID = 2.29971 au 
 T_jup = 3.334 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.127455300248502E-15 -3.150263492567088E-15 -1.68368704436251E-13 2.106672224621387E-16 -2.052412452364139E-14 5.471030655783149E-17
q -3.150263492567088E-15 8.853723707335588E-15 5.371067751081433E-13 -6.75139846597134E-16 7.143602235988721E-14 -1.112445319411803E-16
tp -1.68368704436251E-13 5.371067751081433E-13 3.050826588796115E-9 2.346941873046195E-12 6.473600204013815E-10 4.229596652642955E-13
node 2.106672224621387E-16 -6.75139846597134E-16 2.346941873046195E-12 1.134759603620683E-9 -1.127693959312654E-9 1.951707945959358E-12
peri -2.052412452364139E-14 7.143602235988721E-14 6.473600204013815E-10 -1.127693959312654E-9 1.26568532919868E-9 -1.865523096317732E-12
i 5.471030655783149E-17 -1.112445319411803E-16 4.229596652642955E-13 1.951707945959358E-12 -1.865523096317732E-12 1.219243675731692E-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. 2020-October); 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 
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