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1810 Epimetheus (4196 P-L)
Classification: Main-belt Asteroid          SPK-ID: 2001810
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 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09238622385777473 2.6212e-08  
a 2.223822465652317 4.8892e-09 au
q 2.018371905520613 5.9013e-08 au
i 4.032089876079815 3.0165e-06 deg
node 254.1101640572327 4.3253e-05 deg
peri 204.3562926918569 4.7765e-05 deg
M 334.6668185539212 1.8733e-05 deg
tp 2459285.738506124216
(2021-Mar-12.23850612)
6.2952e-05 TDB
period 1211.291296753716
3.32
3.9947e-06
1.094e-08
d
yr
n .297203489338037 9.8013e-10 deg/d
Q 2.42927302578402 5.3409e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2975  
   data-arc span      25698 days (70.36 yr)  
   first obs. used      1950-09-16  
   last obs. used      2021-01-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41081  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:58:20  

Additional Information
 Earth MOID = 1.03577 au 
 Jupiter MOID = 2.68827 au 
 T_jup = 3.639 
[ 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 12.68   n/a E2021B10  
diameter diameter 7.669 km 0.162 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 28.61 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:
[Pravec, P.; Wolf, M.; Sarounova, L. (2007) http://www.asu.cas.cz/~ppravec/neo.htm]
geometric albedo albedo 0.274   0.037 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

1810 Epimetheus (4196 P-L)          Discovered 1960-Sep-24 by PLS at Palomar
These planets have all been discovered as a result of the Palomar survey of faint minor planets and subsequently identified with planets observed at other oppositions. In Sept. and Oct. 1960, T. Gehrels exposed 130 plates with the 122 cm Schmidt camera at Palomar. In the following years C. J. van Houten and I. van Houten-Groeneveld measured these plates astrometrically and photometrically at Leiden. P. Herget, Cincinnati, computed the orbits of the planets found on the NORC computer, Dahlgren, Virginia, USA.
Note: "planet" implies "minor planet"
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 4196 P-L = 1942 FS = 1950 SC = 1957 WC1 = 1962 GC = 1970 SS 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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