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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 95 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2013135531788418 1.6062e-08  
a 3.147888609551603 1.0238e-08 au
q 2.514175968551566 4.993e-08 au
i 19.52441295679251 4.5176e-07 deg
node 228.3496793556228 2.7713e-06 deg
peri 63.23913330780919 8.4546e-06 deg
M 358.6629502924347 5.4164e-06 deg
tp 2459208.076567794687
(2020-Dec-24.57656779)
3.0699e-05 TDB
period 2039.9872874243
5.59
9.952e-06
2.725e-08
d
yr
n .1764716879459274 8.6091e-10 deg/d
Q 3.78160125055164 1.2299e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2929  
   data-arc span      37008 days (101.32 yr)  
   first obs. used      1919-07-03  
   last obs. used      2020-10-28  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44765  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 11:32:03  

Additional Information
 Earth MOID = 1.56295 au 
 Jupiter MOID = 1.57106 au 
 T_jup = 3.089 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457194.5 (2015-Jun-21.0) TDB
Reference: JPL 95 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1994718495473227 1.6083e-08  
q 2.520254597634985 4.9806e-08 au
tp 2457169.705581546281
(2015-May-27.20558155)
3.1468e-05 TDB
node 228.3764971971737 2.7698e-06 deg
peri 63.3588511028958 8.5447e-06 deg
i 19.52544444804226 4.5189e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      2929  
   data-arc span      37008 days (101.32 yr)  
   first obs. used      1919-07-03  
   last obs. used      2020-10-28  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44765  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 11:32:03  

Additional Information
 Jupiter MOID = 1.57106 au 
 T_jup = 3.089 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.586610946658218E-16 -7.900408505612013E-16 -6.072013006386959E-14 8.05139316740469E-16 -2.561629642394645E-14 -1.43276196506572E-15
q -7.900408505612013E-16 2.480662238691803E-15 1.432557623756187E-13 -2.246577781537986E-15 6.727327959693935E-14 4.58183871319589E-15
tp -6.072013006386959E-14 1.432557623756187E-13 9.902113533731739E-10 2.520237131519454E-12 2.528619486715038E-10 -1.005571766397085E-12
node 8.05139316740469E-16 -2.246577781537986E-15 2.520237131519454E-12 7.671537681923091E-12 -6.958578410148238E-12 3.61661865493679E-13
peri -2.561629642394645E-14 6.727327959693935E-14 2.528619486715038E-10 -6.958578410148238E-12 7.301202613508108E-11 -5.701375985894031E-13
i -1.43276196506572E-15 4.58183871319589E-15 -1.005571766397085E-12 3.61661865493679E-13 -5.701375985894031E-13 2.04203021772264E-13

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

[ show close-approach data ]
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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