Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
IMPORTANT: The SSD Announcement email list is now available. Major changes are coming in the near future, including possible hostname and/or URL changes. To be notified of such changes, subscribe to this email list.

Please visit this page for more details.


JPL Small-Body Database Browser
Search: [ help ]  
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 ]

[ hide orbit diagram ]

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.


[ revert to old Java-based viewer ]

Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1579852441311297 3.7017e-08  
a 2.372053323891389 7.0509e-09 au
q 1.99730390042435 8.8783e-08 au
i 23.47359963083595 4.3601e-06 deg
node 181.7993563828385 9.467e-06 deg
peri 348.2656913033701 1.5396e-05 deg
M 322.7168139129934 1.2323e-05 deg
tp 2458738.696045642664
(2019-Sep-12.19604564)
4.5788e-05 TDB
period 1334.39712784357
3.65
5.9497e-06
1.629e-08
d
yr
n .2697847533453342 1.2029e-09 deg/d
Q 2.746802747358427 8.1648e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2973  
   data-arc span      41870 days (114.63 yr)  
   first obs. used      1904-09-11  
   last obs. used      2019-05-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .36068  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-29 19:16:36  

Additional Information
 Earth MOID = 1.00525 au 
 Jupiter MOID = 2.22564 au 
 T_jup = 3.417 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456180.5 (2012-Sep-10.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1579463392400514 3.7013e-08  
q 1.997549353734864 8.8784e-08 au
tp 2456070.187147295205
(2012-May-22.68714730)
4.5172e-05 TDB
node 181.8285061988813 9.469e-06 deg
peri 348.3430008940769 1.5398e-05 deg
i 23.46965874016536 4.3596e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2973  
   data-arc span      41870 days (114.63 yr)  
   first obs. used      1904-09-11  
   last obs. used      2019-05-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .36068  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-29 19:16:36  

Additional Information
 Jupiter MOID = 2.22564 au 
 T_jup = 3.417 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.369945412515534E-15 -3.278973405676733E-15 2.066893356191113E-13 -4.741278018048352E-16 7.208222788940251E-14 -7.384344349738568E-16
q -3.278973405676733E-15 7.882667821543117E-15 -5.122858641027112E-13 1.216994042297562E-16 -1.767186900265967E-13 2.18092557724488E-15
tp 2.066893356191113E-13 -5.122858641027112E-13 2.040534550408283E-9 -2.062296692659974E-12 5.601974569965498E-10 4.331981052080219E-12
node -4.741278018048352E-16 1.216994042297562E-16 -2.062296692659974E-12 8.966211404868995E-11 -8.247689146663642E-11 2.496257877506727E-12
peri 7.208222788940251E-14 -1.767186900265967E-13 5.601974569965498E-10 -8.247689146663642E-11 2.370947493885807E-10 -1.135573732569983E-12
i -7.384344349738568E-16 2.18092557724488E-15 4.331981052080219E-12 2.496257877506727E-12 -1.135573732569983E-12 1.900607044992501E-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-January); 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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin