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849 Ara (A915 UB)
Classification: Main-belt Asteroid          SPK-ID: 2000849
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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.


Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 93 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .200918135337036 3.6321e-08  
a 3.146181404624356 1.1745e-08 au
q 2.514056503375173 1.1649e-07 au
i 19.53026776519042 4.8085e-06 deg
node 228.3651492309061 1.1358e-05 deg
peri 63.29327824918501 1.5761e-05 deg
M 323.2911500129719 1.1853e-05 deg
tp 2459208.346322623516
(2020-Dec-24.84632262)
6.7641e-05 TDB
period 2038.327982786349
5.58
1.1414e-05
3.125e-08
d
yr
n .1766153450476051 9.8902e-10 deg/d
Q 3.778306305873538 1.4105e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2895  
   data-arc span      37008 days (101.32 yr)  
   first obs. used      1919-07-03  
   last obs. used      2020-10-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44843  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:25:05  

Additional Information
 Earth MOID = 1.56462 au 
 Jupiter MOID = 1.575 au 
 T_jup = 3.090 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455639.5 (2011-Mar-19.0) TDB
Reference: JPL 93 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .197397502720783 3.63e-08  
q 2.530430346299288 1.1676e-07 au
tp 2455132.669487526571
(2009-Oct-28.16948753)
6.2412e-05 TDB
node 228.3779210273125 1.1351e-05 deg
peri 63.97758093655693 1.5908e-05 deg
i 19.51749322765668 4.8055e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2895  
   data-arc span      37008 days (101.32 yr)  
   first obs. used      1919-07-03  
   last obs. used      2020-10-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44843  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:25:05  

Additional Information
 Jupiter MOID = 1.575 au 
 T_jup = 3.090 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.317680605894806E-15 -4.224378951425874E-15 -6.10849473770034E-13 5.952869478815278E-16 -1.011834335921504E-13 -1.662940593311249E-15
q -4.224378951425874E-15 1.363361181097363E-14 1.953689181130681E-12 -3.446161343173108E-15 3.271688326863024E-13 6.586051120802971E-15
tp -6.10849473770034E-13 1.953689181130681E-12 3.895251244962961E-9 -1.279813576588297E-11 7.128901458862413E-10 7.756091057569701E-13
node 5.952869478815278E-16 -3.446161343173108E-15 -1.279813576588297E-11 1.288365069810036E-10 -1.229881711113294E-10 6.03602443372457E-12
peri -1.011834335921504E-13 3.271688326863024E-13 7.128901458862413E-10 -1.229881711113294E-10 2.530548009189085E-10 -5.336663411625118E-12
i -1.662940593311249E-15 6.586051120802971E-15 7.756091057569701E-13 6.03602443372457E-12 -5.336663411625118E-12 2.309262770263656E-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 8.2   n/a MPO473773 IRAS observations used: 4
diameter diameter 80.756 km 1.127 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 4.116 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Harris, A.W.; Young, J.W.; Dockweiler, T.; Gibson, J.; et al. (1992) Icarus 95, 115-147.]
[Behrend, R. (2004) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Durech, J. (2006) IAU 2006, poster paper.]
[Durech, J.; Kaasalainen, M.; Warner, B.D.; Fauerbach, M.; et al. (2009) Astron. Astrophys. 493, 291-297.]
[Gandolfi, D.; Cigna, M.; Fulvio, D.; Blanco, C. (2009) Planet. Space Sci. 57, 1-9.]
[Marciniak, A.; Michalowski, T.; Hirsch, R.; Polinska, K.; et al. (2009) Astron. Astrophys. 498, 313-320.]
[Behrend, R. (2010) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Durech, J.; Kaasalainen, M.; Herald, D.; Dunham, D.; et al. (2011) Icarus 214, 652-670.]
[Hanus, J.; Viikinkoski, M.; Marchis, F.; Durech, J.; et al (2017) Astron. Astrophys. 601, A114.]
[Schmidt, R.E. (2017) Minor Planet Bull. 44, 191-192.]
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.186   0.023 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.701   0.013 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=14.84, mean=18.35, max.=21.79) deg.
U-B UB 0.252   0.016 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=14.84, mean=18.35, max.=21.79) deg.
Tholen spectral type spec_T M   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo

849 Ara (A915 UB)          Discovered 1912-Feb-09 by Belyavskij, S. at Simeis
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
1989-Apr-17 13:29 < 00:01 Jupiter 1.587521802524 1.58752128769749 1.58752231735051 5.19335931176846 5.08958550532418 2447634.061892834 0.412205126833188 87.2166835726578 24.9087179140608 88.3681480294587 3377496.95441229 T 93 CATAB v2.0f-lin.ifort 2020-Nov-13 04:25:14 2020-Nov-13 04:25
2000-Feb-09 12:37 < 00:01 Jupiter 1.76743178689853 1.7674312956344 1.76743227816297 5.53106720795344 5.44373274042701 2451584.025712068 0.267704907292604 62.9455373318127 17.8417411532267 -74.4758247699685 4042276.73644646 T 93 CATAB v2.0f-lin.ifort 2020-Nov-13 04:25:14 2020-Nov-13 04:25
2084-Nov-02 00:26 00:01 Jupiter 1.85643885324632 1.85643756362322 1.85644014287111 4.62575439771206 4.52604460155826 2482531.518066134 1.31352155050133 129.966071446309 41.4604978463886 65.3249641943002 2469377.47709789 T 93 CATAB v2.0f-lin.ifort 2020-Nov-13 04:25:14 2020-Nov-13 04:25
2095-Aug-17 13:34 00:01 Jupiter 1.58659411527988 1.58659364874827 1.58659458181474 5.36081849178532 5.26028997673808 2486472.065239958 1.27132080902837 235.716684110365 19.6448273756235 -87.2749201771698 3659104.8025216 T 93 CATAB v2.0f-lin.ifort 2020-Nov-13 04:25:14 2020-Nov-13 04:25
2191-Feb-18 02:38 00:03 Jupiter 1.67764381226371 1.67764198970985 1.67764563484685 5.00238542248183 4.9004166734312 2521354.609461953 2.80122662460015 384.943868014007 30.5623206220724 76.7180659737801 3011413.78229818 T 93 CATAB v2.0f-lin.ifort 2020-Nov-13 04:25:14 2020-Nov-13 04:25

Alternate Designations
 A915 UB = 1935 FU = 1960 WN = A912 CD 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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