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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 ]

[ show orbit diagram ]
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 
[ 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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
2123-Nov-17 05:46 00:03 Iris 0.00320569661232198 0.0032003785585609 0.00321103583655676 3.80897918865424 3.80897871784817 2496789.740314006 2.80673399575178 490.475120600909 24.841738613974 57.3332380731455 16246.1749665319 T 38 CATAB v2.0f-lin.ifort 2020-Aug-24 22:30:59 2020-Aug-24 22:31
2130-Feb-25 23:48 00:02 Europ 0.0384710867624013 0.0384690478585629 0.0384731275696048 3.2038388078454 3.20383872161377 2499082.491599783 1.94251561952828 476.875809652227 41.0393311733637 -78.7253863890461 137405.611794589 T 38 CATAB v2.0f-lin.ifort 2020-Aug-24 22:30:59 2020-Aug-24 22:31

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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