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2212 Hephaistos (1978 SB)
Classification: Apollo [NEO]          SPK-ID: 2002212
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 447 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .8376666908930736 2.8207e-08  
a 2.159195572489458 5.3936e-09 au
q .3505093622912382 6.0962e-08 au
i 11.55177686044656 5.7939e-06 deg
node 27.53023699013203 2.0665e-05 deg
peri 209.3949550987833 2.046e-05 deg
M 48.90011264904858 5.712e-06 deg
tp 2458843.085854136942
(2019-Dec-25.58585414)
1.7947e-05 TDB
period 1158.874477803545
3.17
4.3422e-06
1.189e-08
d
yr
n .3106462407234306 1.164e-09 deg/d
Q 3.967881782687678 9.9116e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2560  
   data-arc span      15261 days (41.78 yr)  
   first obs. used      1978-09-27  
   last obs. used      2020-07-09  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42692  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jul-10 06:32:08  

Additional Information
 Earth MOID = .115888 au 
 Jupiter MOID = 1.16219 au 
 T_jup = 3.099 
[ 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 13.3   n/a MPO502174  
diameter diameter 5.7 km n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543 based on assumed medium albedo (0.15)
rotation period rot_per 20. h n/a LCDB (Rev. 2019-August); Warner et al., 2009 lower-limit; Result based on fragmentary lightcurve(s), may be completely wrong.
Published Reference List:
[Pravec, P.; Wolf, M.; Sarounova, L.; Mottola, S.; et al. (1997) Icarus 130, 275-286.]
geometric albedo albedo 0.163   0.027 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2011ApJ...743..156M)  
B-V BV 0.766   0.037 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=15.38, mean=15.38, max.=15.38) deg.
U-B UB 0.397   0.031 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=15.38 deg.
Tholen spectral type spec_T SG   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices

2212 Hephaistos           Discovered 1978 Sept. 27 by L. I. Chernykh at the Crimean Astrophysical Observatory.
This Apollo-type object is named for the god of fire and blacksmiths.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC 5849Last Updated: 2006-03-21

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