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1657 Roemera (1961 EA)
Classification: Main-belt Asteroid          SPK-ID: 2001657
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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2369967020420463 3.6834e-08  
a 2.34793747877297 7.4976e-09 au
q 1.791484039702859 8.5329e-08 au
i 23.38325187184279 4.6935e-06 deg
node 105.3082738814736 1.018e-05 deg
peri 54.43773692749107 1.3702e-05 deg
M 167.0632815154383 1.0574e-05 deg
tp 2458390.672891247474
(2018-Sep-29.17289125)
3.7279e-05 TDB
period 1314.099406880271
3.60
6.2944e-06
1.723e-08
d
yr
n .2739518777005277 1.3122e-09 deg/d
Q 2.904390917843081 9.2745e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1725  
   data-arc span      32345 days (88.56 yr)  
   first obs. used      1932-01-10  
   last obs. used      2020-07-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .38941  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:38:35  

Additional Information
 Earth MOID = .878791 au 
 Jupiter MOID = 2.3436 au 
 T_jup = 3.414 
[ 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 12.8   n/a MPO492769  
diameter diameter 7.665 km 0.219 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 34.0 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:
[Warner, B.D. (2009) Minor Planet Bull. 36, 7-13.]
geometric albedo albedo 0.220   0.030 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices

1657 Roemera (1961 EA)          Discovered 1961-Mar-06 by Wild, P. at Zimmerwald
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1961 EA = 1932 AB 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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