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JPL Small-Body Database Browser
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49 Pales
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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 80 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2220670204343255 3.5866e-08  
a 3.105045614871076 8.0371e-09 au
q 2.415517386863988 1.0864e-07 au
i 3.195214934385568 3.7783e-06 deg
node 285.0858073936042 7.1199e-05 deg
peri 112.2986914078243 7.1743e-05 deg
M 240.6294351215798 9.2998e-06 deg
tp 2459263.166707346280
5.2859e-05 TDB
period 1998.482748972795
n .1801366562633764 6.9939e-10 deg/d
Q 3.794573842878165 9.8218e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2759  
   data-arc span      56952 days (155.93 yr)  
   first obs. used      1863-11-20  
   last obs. used      2019-10-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52811  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 01:48:42  

Additional Information
 Earth MOID = 1.42463 au 
 Jupiter MOID = 1.65899 au 
 T_jup = 3.180 
[ 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 7.8   n/a MPO302057  
diameter diameter 166.252 km 2.166 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 20.705 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Published Reference List:
[Behrend, R. (2016) Observatoire de Geneve web site,]
[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] (  
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          Discovered 1857-Sep-19 by Goldschmidt, H. at Paris
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1947 FG = 1950 XJ = 1954 MF = 1988 VU7 = A908 AF 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2020-Jan-19 13:45 UT
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