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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07002490825280791 3.4058e-08  
a 2.938135548308678 1.222e-08 au
q 2.732392876104049 1.0325e-07 au
i 12.60957303348769 4.2324e-06 deg
node 43.1438163505262 1.6369e-05 deg
peri 294.6228301833417 3.3787e-05 deg
M 265.7537180177958 3.0663e-05 deg
tp 2459482.079391857322
(2021-Sep-24.57939186)
0.00015767 TDB
period 1839.527007562717
5.04
1.1476e-05
3.142e-08
d
yr
n .1957024814096001 1.2209e-09 deg/d
Q 3.143878220513306 1.3075e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2620  
   data-arc span      37884 days (103.72 yr)  
   first obs. used      1916-11-16  
   last obs. used      2020-08-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39407  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:23:22  

Additional Information
 Earth MOID = 1.75431 au 
 Jupiter MOID = 2.144 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-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:
[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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