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1809 Prometheus (2522 P-L)
Classification: Main-belt Asteroid          SPK-ID: 2001809
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1003289414337459 1.4162e-08  
a 2.925759333714431 9.3805e-09 au
q 2.63222099687296 4.1059e-08 au
i 3.259588091576568 2.5058e-07 deg
node 99.45340377614832 1.1765e-05 deg
peri 230.5182689755367 1.8336e-05 deg
M 40.52625810541364 1.1431e-05 deg
tp 2458994.726080020870
5.8033e-05 TDB
period 1827.916384478416
n .1969455512609367 9.4716e-10 deg/d
Q 3.219297670555901 1.0322e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3168  
   data-arc span      23888 days (65.40 yr)  
   first obs. used      1955-09-18  
   last obs. used      2021-02-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43169  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 12:58:24  

Additional Information
 Earth MOID = 1.62066 au 
 Jupiter MOID = 2.08338 au 
 T_jup = 3.268 
[ 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 11.74   n/a E2021B10  
diameter diameter 14.212 km 0.097 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 22.447 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:
[Behrend, R. (2018) Observatoire de Geneve web site,]
[Durech, J.; Hanus, J.; Ali-Lagoa, V. (2018) Astron. Astrophys. 617, A57.]
[Erasmus, N.; Navarro-Meza, S.; McNeill, A.; Trilling, D.E.; et al. (2020) Ap. J. Suppl. Ser. 247, A13.]
geometric albedo albedo 0.126   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

1809 Prometheus (2522 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
 2522 P-L = 1943 EA1 = 1955 SW = 1955 VA = 1965 UR 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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