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49 Pales (A857 SB)
Classification: Main-belt Asteroid          SPK-ID: 2000049
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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 84 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2213789858165928 3.3255e-08  
a 3.097694327143413 6.8548e-09 au
q 2.411929898630591 1.014e-07 au
i 3.201814607179424 3.5969e-06 deg
node 285.0550388007491 6.9236e-05 deg
peri 112.9573097517451 6.9786e-05 deg
M 312.0438869542764 8.7725e-06 deg
tp 2459265.775866638303
(2021-Feb-20.27586664)
4.8773e-05 TDB
period 1991.389750431519
5.45
6.61e-06
1.81e-08
d
yr
n .1807782730236463 6.0006e-10 deg/d
Q 3.783458755656234 8.3723e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3005  
   data-arc span      57314 days (156.92 yr)  
   first obs. used      1863-11-20  
   last obs. used      2020-10-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5219  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:33:58  

Additional Information
 Earth MOID = 1.4218 au 
 Jupiter MOID = 1.66956 au 
 T_jup = 3.182 
[ hide covariance matrix ]
Orbital Elements at Epoch 2454892.5 (2009-Mar-02.0) TDB
Reference: JPL 84 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2298676235515771 3.4364e-08  
q 2.383333659497686 1.0712e-07 au
tp 2455271.499652297091
(2010-Mar-15.99965230)
3.9393e-05 TDB
node 286.1303315474263 7.0332e-05 deg
peri 109.719742348881 7.0734e-05 deg
i 3.178355066322241 3.5754e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3005  
   data-arc span      57314 days (156.92 yr)  
   first obs. used      1863-11-20  
   last obs. used      2020-10-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5219  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:33:58  

Additional Information
 Jupiter MOID = 1.66956 au 
 T_jup = 3.182 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.180898807476425E-15 -3.677350781668738E-15 -6.608903176418519E-14 1.155226232343758E-16 -1.626074883786936E-14 -3.413995388938945E-17
q -3.677350781668738E-15 1.147557085703104E-14 2.94444605942292E-13 3.898103039177074E-15 6.426291198170989E-14 2.43758755053844E-16
tp -6.608903176418519E-14 2.94444605942292E-13 1.551772844795393E-9 5.091960751507099E-12 3.134197744424343E-10 5.501521213927774E-13
node 1.155226232343758E-16 3.898103039177074E-15 5.091960751507099E-12 4.946618476366313E-9 -4.938571438588111E-9 -2.988701429711982E-11
peri -1.626074883786936E-14 6.426291198170989E-14 3.134197744424343E-10 -4.938571438588111E-9 5.003293840470062E-9 2.989407132262649E-11
i -3.413995388938945E-17 2.43758755053844E-16 5.501521213927774E-13 -2.988701429711982E-11 2.989407132262649E-11 1.278324380930475E-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 7.8   n/a MPO302057  
diameter diameter 166.252 km 2.166 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 20.705 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Behrend, R. (2016) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Pilcher, F.; Benishek, V.; Klinglesmith III, D.A. (2016) Minor Planet Bull. 43, 182-183.]
[Pilcher, F. (2017) Minor Planet Bull. 44, 249-251.]
[Pilcher, F. (2018) Minor Planet Bull. 45, 356-359.]
geometric albedo albedo 0.048   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.749   0.045 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=5; phase (min.=2.44, mean=12.29, max.=19.60) deg.
U-B UB 0.411   0.044 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=2.44, mean=11.44, max.=19.60) deg.
Tholen spectral type spec_T CG   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices
SMASSII spectral type spec_B Ch   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)

49 Pales (A857 SB)          Discovered 1857-Sep-19 by Goldschmidt, H. at Paris
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 A857 SB = 1947 FG = 1950 XJ = 1954 MF = 1988 VU7 = A908 AF 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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