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JPL Small-Body Database Browser
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845 Naema (A916 WM)
Classification: Main-belt Asteroid          SPK-ID: 2000845
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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06984363307407687 3.92e-08  
a 2.937823537394613 1.3849e-08 au
q 2.732635268212437 1.1528e-07 au
i 12.61031096510392 4.3529e-06 deg
node 43.14550725573735 1.9268e-05 deg
peri 294.8533754657063 3.5846e-05 deg
M 187.1959361581042 3.1055e-05 deg
tp 2459483.353080472995
(2021-Sep-25.85308047)
0.00016036 TDB
period 1839.233996609413
5.04
1.3006e-05
3.561e-08
d
yr
n .1957336590470011 1.3841e-09 deg/d
Q 3.143011806576789 1.4817e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2144  
   data-arc span      37430 days (102.48 yr)  
   first obs. used      1916-11-16  
   last obs. used      2019-05-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42816  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-29 19:14:59  

Additional Information
 Earth MOID = 1.75361 au 
 Jupiter MOID = 2.14502 au 
 T_jup = 3.234 
[ 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 10.2   n/a MPO302063  
diameter diameter 52.677 km 0.291 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 20.892 h n/a LCDB (Rev. 2019-January); 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:
[Bembrick, C.; Allen, B.; Bolt, G. (2008) Minor Planet Bull. 35, 74-75.]
geometric albedo albedo 0.041   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
SMASSII spectral type spec_B C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

845 Naema (A916 WM)          Discovered 1916-Nov-16 by Wolf, M. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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