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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 45 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1580309461077545 1.1232e-08  
a 2.372926146252075 4.9765e-09 au
q 1.997930382316032 2.6249e-08 au
i 23.47749086013707 3.7865e-07 deg
node 181.7543632919065 1.7445e-06 deg
peri 348.5236820095475 4.1888e-06 deg
M 124.3484974336452 3.4834e-06 deg
tp 2458739.328138947516
(2019-Sep-12.82813895)
1.2438e-05 TDB
period 1335.133704108383
3.66
4.2e-06
1.15e-08
d
yr
n .2696359165319792 8.4821e-10 deg/d
Q 2.747921910188118 5.7629e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3807  
   data-arc span      42464 days (116.26 yr)  
   first obs. used      1904-09-11  
   last obs. used      2020-12-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .33652  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 11:40:24  

Additional Information
 Earth MOID = 1.00486 au 
 Jupiter MOID = 2.22171 au 
 T_jup = 3.416 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457037.5 (2015-Jan-15.0) TDB
Reference: JPL 45 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1584687942213143 1.1191e-08  
q 1.99577702536391 2.6127e-08 au
tp 2457404.549991404794
(2016-Jan-17.04999140)
1.1897e-05 TDB
node 181.814115762176 1.7456e-06 deg
peri 348.3528949472815 4.1834e-06 deg
i 23.47398143685606 3.7878e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      3807  
   data-arc span      42464 days (116.26 yr)  
   first obs. used      1904-09-11  
   last obs. used      2020-12-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .33652  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 11:40:24  

Additional Information
 Jupiter MOID = 2.22171 au 
 T_jup = 3.416 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.25234714275574E-16 -2.887628565307312E-16 8.662116678618359E-14 3.253187447291258E-15 2.607525307497149E-14 -1.034665730415382E-15
q -2.887628565307312E-16 6.826087579009254E-16 -2.082720398707073E-13 -7.977165977658327E-15 -6.283628465929714E-14 2.367396216480834E-15
tp 8.662116678618359E-14 -2.082720398707073E-13 1.415296330947475E-10 -3.699911532182793E-12 4.724501239750831E-11 -1.388036985295667E-12
node 3.253187447291258E-15 -7.977165977658327E-15 -3.699911532182793E-12 3.04705511159907E-12 -3.280580038252714E-12 4.555125186801903E-13
peri 2.607525307497149E-14 -6.283628465929714E-14 4.724501239750831E-11 -3.280580038252714E-12 1.750059474998559E-11 -7.380631671561422E-13
i -1.034665730415382E-15 2.367396216480834E-15 -1.388036985295667E-12 4.555125186801903E-13 -7.380631671561422E-13 1.434734704308265E-13

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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