Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
JPL Small-Body Database Browser
Search: [ help ]  
1813 Imhotep (7589 P-L)
Classification: Main-belt Asteroid          SPK-ID: 2001813
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ hide orbit diagram ]

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.

[ revert to old Java-based viewer ]

Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07888888331429979 4.2859e-08  
a 2.68315388171646 8.9657e-09 au
q 2.47148286822742 1.144e-07 au
i 8.087276050914801 4.5706e-06 deg
node 35.11723465760224 2.391e-05 deg
peri 166.0999364645645 3.2526e-05 deg
M 5.433390763707034 2.0728e-05 deg
tp 2458976.271014099288
9.2451e-05 TDB
period 1605.339152582013
n .2242516787938419 1.124e-09 deg/d
Q 2.894824895205501 9.673e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2731  
   data-arc span      21840 days (59.79 yr)  
   first obs. used      1960-10-17  
   last obs. used      2020-08-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41758  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:41:14  

Additional Information
 Earth MOID = 1.46862 au 
 Jupiter MOID = 2.0624 au 
 T_jup = 3.357 
[ 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 12.0   n/a MPO431515  
diameter diameter 19.099 km 0.184 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 17.994 h n/a LCDB (Rev. 2019-August); 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:
[Gross, J. (2003) Minor Planet Bull. 30, 44-46.]
[Behrend, R. (2011) Observatoire de Geneve web site,]
geometric albedo albedo 0.092   0.013 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

1813 Imhotep (7589 P-L)          Discovered 1960-Oct-17 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

Alternate Designations
 7589 P-L = 1967 DC = 1969 TT5 = 1971 BA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
FirstGov 2020-Sep-21 17:19 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin