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
JPL Small-Body Database Browser
Search: [ help ]  
642 Clara (A907 RJ)
Classification: Main-belt Asteroid          SPK-ID: 2000642
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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1256815754255753 4.1018e-08  
a 3.191225361134086 1.5671e-08 au
q 2.790147130208704 1.332e-07 au
i 8.15512489608553 5.0318e-06 deg
node 5.329776102363506 2.8054e-05 deg
peri 120.1545615115164 3.3209e-05 deg
M 187.134586841244 1.8682e-05 deg
tp 2460000.362422364094
(2023-Feb-24.86242236)
0.00010941 TDB
period 2082.258477700817
5.70
1.5338e-05
4.199e-08
d
yr
n .1728891988460068 1.2735e-09 deg/d
Q 3.592303592059468 1.764e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3428  
   data-arc span      41232 days (112.89 yr)  
   first obs. used      1907-09-11  
   last obs. used      2020-07-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .3636  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:19:35  

Additional Information
 Earth MOID = 1.81634 au 
 Jupiter MOID = 1.49202 au 
 T_jup = 3.169 
[ 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 10.0   n/a MPO492757 IRAS observations used: 14
diameter diameter 33.36 km 1.5 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 14
rotation period rot_per 8.2308 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[LeCrone, C.; Mills, G.; Ditteon, R. (2005) Minor Planet Bull. 32, 62-64.]
[Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.1617   0.015 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 14
B-V BV 0.897   0.106 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=4.37, mean=4.43, max.=4.49) deg.
U-B UB 0.417   0.040 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=4.37, mean=4.43, max.=4.49) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices
SMASSII spectral type spec_B L   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)

642 Clara (A907 RJ)          Discovered 1907-Sep-08 by Wolf, M. 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
1976-Jan-29 14:52 00:01 Jupiter 1.92413163268813 1.92413077558925 1.92413248978712 3.88613702366246 3.77115902820437 2442807.119740471 1.02738504480565 64.3857586823625 29.9694747116878 -65.4149090737934 2407120.53575889 T 34 CATAB v2.0f-lin.ifort 2020-Aug-24 22:19:52 2020-Aug-24 22:19
1986-Dec-06 13:47 < 00:01 Jupiter 1.62866697931845 1.62866634785927 1.62866761077828 3.01915231262186 2.8416788389835 2446771.074627362 0.753770367364826 130.402539262133 20.0879615754523 -82.8926044485244 2096657.9889875 T 34 CATAB v2.0f-lin.ifort 2020-Aug-24 22:19:52 2020-Aug-24 22:19
1997-Nov-05 10:56 < 00:01 Jupiter 1.53903439383186 1.53903394134282 1.53903484632091 2.36944572373593 2.12451256212936 2450757.955415437 0.470541742771997 129.621232945104 26.1116899176298 87.5277902469196 1938001.13493116 T 34 CATAB v2.0f-lin.ifort 2020-Aug-24 22:19:52 2020-Aug-24 22:19
2008-Sep-24 20:21 < 00:01 Jupiter 1.67915012542173 1.67914964197406 1.6791506088692 1.86485974107702 1.57125152375641 2454734.347786668 0.30626112490903 77.8610314055106 37.8215957238752 70.553098531767 2153411.61296644 T 34 CATAB v2.0f-lin.ifort 2020-Aug-24 22:19:52 2020-Aug-24 22:19
2019-Jul-20 07:31 < 00:01 Jupiter 1.94327104376006 1.94327051793677 1.94327156958346 2.40245057311644 2.21359877316624 2458684.813427098 0.335439843252439 52.0609238320605 7.40629733714146 69.7426413802614 3028135.38956557 T 34 CATAB v2.0f-lin.ifort 2020-Aug-24 22:19:52 2020-Aug-24 22:19
2106-Oct-24 18:14 00:02 Jupiter 1.96116386698646 1.96116274013421 1.96116499383882 3.84195451842833 3.72784371485181 2490557.259624608 1.75336058424125 64.5893951042054 34.7877242815432 -48.2640907014436 2000933.10411252 T 34 CATAB v2.0f-lin.ifort 2020-Aug-24 22:19:52 2020-Aug-24 22:19
2117-Aug-26 07:10 00:02 Jupiter 1.63989698291339 1.63989602200474 1.63989794382212 3.02821075483235 2.85254994675012 2494515.798621795 1.89085057492244 122.879065351998 34.2731465678985 -81.7359760567191 1669862.00189549 T 34 CATAB v2.0f-lin.ifort 2020-Aug-24 22:19:52 2020-Aug-24 22:19
2128-Jul-25 10:12 00:02 Jupiter 1.50765843317177 1.50765797518702 1.50765889115713 2.50327296116029 2.26776298942037 2498501.924657799 2.05940228123085 207.077574832206 29.4208813534637 -87.0751342991885 1679659.01759269 T 34 CATAB v2.0f-lin.ifort 2020-Aug-24 22:19:52 2020-Aug-24 22:19
2139-Jun-22 03:50 00:03 Jupiter 1.63849838550074 1.63849724693528 1.63849952406658 2.0542537681708 1.78495310793804 2502485.659643007 2.52924406675219 85.4541832556448 82.3878359530424 26.4854665311154 2135382.17857501 T 34 CATAB v2.0f-lin.ifort 2020-Aug-24 22:19:52 2020-Aug-24 22:19
2150-Apr-15 20:24 00:03 Jupiter 1.92135223249095 1.92135069153148 1.92135377344933 2.34320264143743 2.14683591934781 2506436.349782747 2.94442752994709 56.4771096455027 37.1676865383053 -88.3132090496231 1159706.8178327 T 34 CATAB v2.0f-lin.ifort 2020-Aug-24 22:19:52 2020-Aug-24 22:19

Alternate Designations
 A907 RJ = 1949 BS 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Sep-29 12:07 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin