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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1579309067096668 3.1288e-08  
a 2.372268038072363 6.1446e-09 au
q 1.997613595861232 7.3703e-08 au
i 23.47301924223601 3.7736e-06 deg
node 181.7907025895827 9.2988e-06 deg
peri 348.3738350902613 1.5081e-05 deg
M 70.5500991948485 1.2269e-05 deg
tp 2458738.959354552626
(2019-Sep-12.45935455)
4.5283e-05 TDB
period 1334.578312937791
3.65
5.1852e-06
1.42e-08
d
yr
n .2697481268128331 1.048e-09 deg/d
Q 2.746922480283494 7.1151e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3309  
   data-arc span      42284 days (115.77 yr)  
   first obs. used      1904-09-11  
   last obs. used      2020-06-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .34762  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:23:36  

Additional Information
 Earth MOID = 1.00504 au 
 Jupiter MOID = 2.22393 au 
 T_jup = 3.417 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456559.5 (2013-Sep-24.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1581341225148813 3.126e-08  
q 1.997131165743778 7.3701e-08 au
tp 2456070.215132136050
(2012-May-22.71513214)
4.4475e-05 TDB
node 181.8165250559108 9.3015e-06 deg
peri 348.3409730547102 1.5079e-05 deg
i 23.46929348087091 3.773e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3309  
   data-arc span      42284 days (115.77 yr)  
   first obs. used      1904-09-11  
   last obs. used      2020-06-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .34762  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:23:36  

Additional Information
 Jupiter MOID = 2.22393 au 
 T_jup = 3.417 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.771718303144052E-16 -2.298213239512886E-15 1.688245413220528E-13 -2.294746227140667E-15 4.143198442749604E-14 3.913406701455391E-17
q -2.298213239512886E-15 5.431896486021002E-15 -4.116322865313667E-13 4.687807734093117E-15 -9.888136976529308E-14 -9.967320730306017E-17
tp 1.688245413220528E-13 -4.116322865313667E-13 1.978064957579944E-9 -9.9259750394945E-14 5.405182542884413E-10 -1.619780204109698E-12
node -2.294746227140667E-15 4.687807734093117E-15 -9.9259750394945E-14 8.651821018948724E-11 -7.920188352950514E-11 4.984999614789593E-12
peri 4.143198442749604E-14 -9.888136976529308E-14 5.405182542884413E-10 -7.920188352950514E-11 2.273612945204219E-10 -4.957309539153543E-12
i 3.913406701455391E-17 -9.967320730306017E-17 -1.619780204109698E-12 4.984999614789593E-12 -4.957309539153543E-12 1.423548809785286E-11

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

[ 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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