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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 
[ 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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
2086-Dec-01 13:10 < 00:01 Inter 0.0454262307322476 0.045422109361818 0.0454303521322366 10.3904319004849 10.3904318694695 2483291.048461896 0.223897625598162 213.597145514891 27.0459169048498 -15.9673006509852 75570.5371753364 T 45 CATAB v2.0f-lin.ifort 2021-Apr-12 11:42:02 2021-Apr-12 11:42
2167-Apr-13 13:15 < 00:01 Inter 0.0367017371292827 0.0367011490733333 0.0367023255372862 10.1552526651078 10.1552526258305 2512643.051801448 0.306554389870704 415.290730234476 26.4418540343951 -88.2456799351315 207513.601472673 T 45 CATAB v2.0f-lin.ifort 2021-Apr-12 11:42:02 2021-Apr-12 11:42

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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