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950 Ahrensa (A921 GG)
Classification: Main-belt Asteroid          SPK-ID: 2000950
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1580310160083196 2.8561e-08  
a 2.372926146749665 5.1932e-09 au
q 1.997930216866108 6.6823e-08 au
i 23.47749314442593 3.1768e-06 deg
node 181.7543615008958 9.2046e-06 deg
peri 348.5236723007087 1.4905e-05 deg
M 124.3485075897849 1.221e-05 deg
tp 2458739.328101136334
(2019-Sep-12.82810114)
4.4988e-05 TDB
period 1335.133704528338
3.66
4.3829e-06
1.2e-08
d
yr
n .2696359164471674 8.8515e-10 deg/d
Q 2.747922076633221 6.0139e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3742  
   data-arc span      42464 days (116.26 yr)  
   first obs. used      1904-09-11  
   last obs. used      2020-12-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .33626  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:51:11  

Additional Information
 Earth MOID = 1.00486 au 
 Jupiter MOID = 2.22171 au 
 T_jup = 3.416 
[ 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 11.25   n/a E2021B10  
diameter diameter 13.704 km 0.258 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 202. h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Warner, B.D. (2010) Minor Planet Bull. 37, 24-27.]
geometric albedo albedo 0.231   0.031 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
SMASSII spectral type spec_B Sa   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)

950 Ahrensa (A921 GG)          Discovered 1921-Apr-01 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A921 GG = 1955 SU2 = 1974 VG3 = A904 RF 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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