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 
[ 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-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

[ 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 34 CATAB v2.0e-lin.ifort 2019-May-29 19:16:48 2019-May-29 19:16
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 34 CATAB v2.0e-lin.ifort 2019-May-29 19:16:48 2019-May-29 19:16

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