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1345 Potomac (A908 CE)
Classification: Outer Main-belt Asteroid          SPK-ID: 2001345
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .181423783777352 3.4197e-08  
a 3.983672022786101 2.3324e-08 au
q 3.260939171084269 1.3473e-07 au
i 11.40255607920907 4.0865e-06 deg
node 137.4318094135188 2.2542e-05 deg
peri 333.0230641331241 2.5823e-05 deg
M 81.0621906467817 1.2263e-05 deg
tp 2458346.557406205126
(2018-Aug-16.05740621)
9.7861e-05 TDB
period 2904.181738585932
7.95
2.5506e-05
6.983e-08
d
yr
n .1239591845155278 1.0887e-09 deg/d
Q 4.706404874487934 2.7556e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2876  
   data-arc span      41102 days (112.53 yr)  
   first obs. used      1908-02-25  
   last obs. used      2020-09-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42522  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:19:55  

Additional Information
 Earth MOID = 2.28267 au 
 Jupiter MOID = .461831 au 
 T_jup = 2.993 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456271.5 (2012-Dec-10.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1831062560976889 3.4176e-08  
q 3.257784777795973 1.3505e-07 au
tp 2455434.027555828045
(2010-Aug-25.52755583)
9.6149e-05 TDB
node 137.4812531664465 2.2554e-05 deg
peri 332.8156062017972 2.577e-05 deg
i 11.39791563978586 4.0849e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2876  
   data-arc span      41102 days (112.53 yr)  
   first obs. used      1908-02-25  
   last obs. used      2020-09-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42522  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:19:55  

Additional Information
 Jupiter MOID = .461831 au 
 T_jup = 2.993 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.168029696599754E-15 -4.570432499999404E-15 -1.308663620847972E-13 -1.060033765742447E-15 -2.581752484699573E-14 -6.916197118860763E-16
q -4.570432499999404E-15 1.823849160808189E-14 3.520655071399604E-13 5.055249780503532E-15 9.859185582061771E-14 3.038140219756926E-15
tp -1.308663620847972E-13 3.520655071399604E-13 9.244676122482581E-9 3.809566877087939E-12 1.236518898853905E-9 -5.394998844999129E-13
node -1.060033765742447E-15 5.055249780503532E-15 3.809566877087939E-12 5.08693576714956E-10 -4.978347312384206E-10 9.466070616127386E-12
peri -2.581752484699573E-14 9.859185582061771E-14 1.236518898853905E-9 -4.978347312384206E-10 6.640689049704089E-10 -9.320679315070219E-12
i -6.916197118860763E-16 3.038140219756926E-15 -5.394998844999129E-13 9.466070616127386E-12 -9.320679315070219E-12 1.668602147044144E-11

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 9.9   n/a MPO473781 IRAS observations used: 9
diameter diameter 72.976 km 0.443 urn:nasa:pds:neowise_diameters_albedos::2.0[hildas] (http://adsabs.harvard.edu/abs/2012ApJ...744..197G)  
rotation period rot_per 11.420 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Dahlgren, M.; Lahulla, J.F.; Lagerkvist, C.-I.; Lagerros, J.; et al. (1998) Icarus 133, 247-285.]
[Brinsfield, J.W. (2010) Minor Planet Bull. 37, 50-53.]
[Warner, B.D.; Stephens, R.D. (2020) Minor Planet Bull. 47, 196-199.]
geometric albedo albedo 0.043   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[hildas] (http://adsabs.harvard.edu/abs/2012ApJ...744..197G)  
B-V BV 0.719   0.008 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=4.38, mean=6.75, max.=11.14) deg.
U-B UB 0.286   0.025 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=4.38, mean=6.75, max.=11.14) deg.
Tholen spectral type spec_T X   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 4 color indices

1345 Potomac (A908 CE)          Discovered 1908-Feb-04 by Metcalf, J. H. at Taunton
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A908 CE = 1932 CF = 1932 EA = 1932 FB = 1971 DE2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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