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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 503 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .8375831680561604 1.775e-08  
a 2.159239025592234 5.2507e-09 au
q .3506967619461938 3.8362e-08 au
i 11.54907507448942 2.0961e-06 deg
node 27.52794130768473 8.6896e-06 deg
peri 209.4020775974215 8.5991e-06 deg
M 111.0346470508358 5.7139e-06 deg
tp 2458843.058047337380
(2019-Dec-25.55804734)
1.7401e-05 TDB
period 1158.909460932759
3.17
4.2273e-06
1.157e-08
d
yr
n .310636863478749 1.1331e-09 deg/d
Q 3.967781289238274 9.6486e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2945  
   data-arc span      15502 days (42.44 yr)  
   first obs. used      1978-09-27  
   last obs. used      2021-03-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42245  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 13:29:23  

Additional Information
 Earth MOID = .115831 au 
 Jupiter MOID = 1.1613 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 13.33   n/a MPCxxxxx  
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. 2020-October); 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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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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