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JPL Small-Body Database Browser
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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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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 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1579309090720243 3.4318e-08  
a 2.372268037723355 6.4916e-09 au
q 1.997613589963198 8.168e-08 au
i 23.47301851465222 4.1498e-06 deg
node 181.790702861765 9.3186e-06 deg
peri 348.3738347725767 1.5195e-05 deg
M 70.55009958525477 1.2298e-05 deg
tp 2458738.959353163043
(2019-Sep-12.45935316)
4.538e-05 TDB
period 1334.578312643275
3.65
5.4781e-06
1.5e-08
d
yr
n .2697481268723612 1.1072e-09 deg/d
Q 2.746922485483511 7.5169e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3110  
   data-arc span      42233 days (115.63 yr)  
   first obs. used      1904-09-11  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .35624  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:15:59  

Additional Information
 Earth MOID = 1.00504 au 
 Jupiter MOID = 2.22393 au 
 T_jup = 3.417 
[ 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 11.2   n/a MPO365254  
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. 2019-August); 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

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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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