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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1573864670934356 2.7023e-08  
a 2.718554994727856 8.6765e-09 au
q 2.290691228508425 7.7565e-08 au
i 6.051937476266302 7.3168e-07 deg
node 140.6124302344112 1.0825e-05 deg
peri 216.9291074474645 9.8543e-06 deg
M 320.6445780698479 5.8196e-06 deg
tp 2459379.481310373348
(2021-Jun-13.98131037)
2.6954e-05 TDB
period 1637.214609177896
4.48
7.838e-06
2.146e-08
d
yr
n .2198856508987352 1.0527e-09 deg/d
Q 3.146418760947286 1.0042e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3216  
   data-arc span      38630 days (105.76 yr)  
   first obs. used      1915-02-05  
   last obs. used      2020-11-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .41519  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 12:12:07  

Additional Information
 Earth MOID = 1.2879 au 
 Jupiter MOID = 2.29904 au 
 T_jup = 3.334 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456423.5 (2013-May-11.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1558278121763321 2.7159e-08  
q 2.295948375475976 7.7765e-08 au
tp 2456112.600844929859
(2012-Jul-04.10084493)
2.2635e-05 TDB
node 140.688256601433 1.0857e-05 deg
peri 218.0214532871656 9.9019e-06 deg
i 6.041018409052788 7.303e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      3216  
   data-arc span      38630 days (105.76 yr)  
   first obs. used      1915-02-05  
   last obs. used      2020-11-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .41519  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 12:12:07  

Additional Information
 Jupiter MOID = 2.29904 au 
 T_jup = 3.334 
Orbit Covariance (6×6)
  e q tp node peri i
e 7.376218782850089E-16 -2.105220625412618E-15 -1.971671005477483E-13 2.60860653770049E-14 -3.006651895754226E-14 -4.550145052513784E-16
q -2.105220625412618E-15 6.047444871418629E-15 5.330042355069351E-13 -6.913772468410299E-14 7.977740955723137E-14 1.546879448342223E-15
tp -1.971671005477483E-13 5.330042355069351E-13 5.123380390430179E-10 8.162863284562349E-11 4.752290839531994E-12 1.809759629527469E-12
node 2.60860653770049E-14 -6.913772468410299E-14 8.162863284562349E-11 1.17864574209515E-10 -9.943262918800116E-11 9.021994899253369E-13
peri -3.006651895754226E-14 7.977740955723137E-14 4.752290839531994E-12 -9.943262918800116E-11 9.804740086287515E-11 -6.402474933558275E-13
i -4.550145052513784E-16 1.546879448342223E-15 1.809759629527469E-12 9.021994899253369E-13 -6.402474933558275E-13 5.333438175358788E-13

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 10.84   n/a E2021B10  
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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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 42 CATAB v2.0f-lin.ifort 2021-Apr-12 12:13:02 2021-Apr-12 12:13
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 42 CATAB v2.0f-lin.ifort 2021-Apr-12 12:13:02 2021-Apr-12 12:13

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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