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2245 Hekatostos (1968 BC)
Classification: Main-belt Asteroid          SPK-ID: 2002245
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .133778822825419 2.9495e-08  
a 2.635726614742327 1.0566e-08 au
q 2.283122210932472 7.703e-08 au
i 11.85166027836773 6.1574e-07 deg
node 85.18049252201276 3.99e-06 deg
peri 316.7703157983243 6.9268e-06 deg
M 191.3222403706629 7.8048e-06 deg
tp 2459932.825729947236
(2022-Dec-19.32572995)
3.6873e-05 TDB
period 1562.963981501401
4.28
9.3984e-06
2.573e-08
d
yr
n .230331603453958 1.385e-09 deg/d
Q 2.988331018552182 1.198e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2521  
   data-arc span      22735 days (62.25 yr)  
   first obs. used      1958-12-04  
   last obs. used      2021-03-03  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .3934  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 13:31:54  

Additional Information
 Earth MOID = 1.30756 au 
 Jupiter MOID = 2.39906 au 
 T_jup = 3.355 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457090.5 (2015-Mar-09.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .131828170541286 2.9453e-08  
q 2.290380697154131 7.6827e-08 au
tp 2456806.809573569852
(2014-May-29.30957357)
2.7069e-05 TDB
node 85.2918977478017 3.9873e-06 deg
peri 317.082939837742 6.962e-06 deg
i 11.85173722778283 6.1635e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      2521  
   data-arc span      22735 days (62.25 yr)  
   first obs. used      1958-12-04  
   last obs. used      2021-03-03  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .3934  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 13:31:54  

Additional Information
 Jupiter MOID = 2.39906 au 
 T_jup = 3.355 
Orbit Covariance (6×6)
  e q tp node peri i
e 8.674562284115568E-16 -2.246753768065814E-15 5.716768508057785E-13 -1.046606516495352E-14 7.694461917629705E-14 3.773164683536414E-15
q -2.246753768065814E-15 5.902420718415567E-15 -1.437404062497292E-12 2.685232859298535E-14 -1.847000333998294E-13 -9.763319563016302E-15
tp 5.716768508057785E-13 -1.437404062497292E-12 7.327286917353156E-10 -1.819082104109372E-11 1.476228428941098E-10 7.37765223323893E-13
node -1.046606516495352E-14 2.685232859298535E-14 -1.819082104109372E-11 1.589829698033141E-11 -1.895078072659464E-11 1.628945899012744E-12
peri 7.694461917629705E-14 -1.847000333998294E-13 1.476228428941098E-10 -1.895078072659464E-11 4.84691723775143E-11 -1.610481032898757E-12
i 3.773164683536414E-15 -9.763319563016302E-15 7.37765223323893E-13 1.628945899012744E-12 -1.610481032898757E-12 3.79882874379436E-13

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 11.82   n/a MPCxxxxx  
diameter diameter 29.28 km 1.0 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 10
rotation period rot_per 20.61 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Klinglesmith, D.A. III; DeHart, A.; Hanowell, J.; Hendrickx, S. (2015) Minor Planet Bull. 42, 158-159.]
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.0622   0.005 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 10

2245 Hekatostos           Discovered 1968 Jan. 24 by L. I. Chernykh at the Crimean Astrophysical Observatory.
The Greek ordinal number acknowledges this as the 100th minor planet to be numbered as a result of the joint observational program of the Institute for Theoretical Astronomy in Leningrad and the Crimean Astrophysical Observatory at Nauchnij.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC 5850Last Updated: 2006-03-21

Alternate Designations
 1968 BC = 1930 FA = 1958 XC = 1966 QV = 1971 XC 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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