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14120 Espenak (1998 QJ54)
Classification: Main-belt Asteroid          SPK-ID: 2014120
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 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08793439607536001 1.032e-08  
a 2.383299213519593 6.8097e-09 au
q 2.173725236511867 2.7345e-08 au
i 5.986066679011411 5.6227e-07 deg
node 222.8837372000097 7.9749e-06 deg
peri 213.4489883088827 1.7352e-05 deg
M 313.086388234546 1.4494e-05 deg
tp 2459375.630847821204
(2021-Jun-10.13084782)
5.4348e-05 TDB
period 1343.897918813825
3.68
5.7598e-06
1.577e-08
d
yr
n .2678774890266588 1.1481e-09 deg/d
Q 2.592873190527319 7.4085e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2410  
   data-arc span      14696 days (40.24 yr)  
   first obs. used      1980-12-10  
   last obs. used      2021-03-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46037  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 00:17:37  

Additional Information
 Earth MOID = 1.19078 au 
 Jupiter MOID = 2.6155 au 
 T_jup = 3.524 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.7   n/a MPO492908  
diameter diameter 13.20 km 1.4 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 2
rotation period rot_per 7.243 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:
[Erasmus, N.; Navarro-Meza, S.; McNeill, A.; Trilling, D.E.; et al. (2020) Ap. J. Suppl. Ser. 247, A13.]
geometric albedo albedo 0.0368   0.009 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 2

14120 Espenak           Discovered 1998 Aug. 27 by the Lowell Observatory Near-Earth Object Search at the Anderson Mesa Station.
Fred Espenak Jr. (b. 1952), of NASA Goddard Space Flight Center, is widely recognized for his calculations of solar eclipses, his magnificent maps of these phenomena and his book Totality: Eclipses of the Sun.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20030318/MPCPages.arcLast Updated: 2003-10-02

Alternate Designations
 1998 QJ54 = 1980 XJ2 = 1987 SK25 = 2000 AG237 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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