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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 85 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2213789851376915 3.3195e-08  
a 3.097694326936261 6.8284e-09 au
q 2.411929900572327 1.0124e-07 au
i 3.201814650952344 3.5877e-06 deg
node 285.0550385906103 6.9225e-05 deg
peri 112.9573098028022 6.9773e-05 deg
M 312.0438871902363 8.7427e-06 deg
tp 2459265.775865306449
(2021-Feb-20.27586531)
4.8603e-05 TDB
period 1991.389750231764
5.45
6.5845e-06
1.803e-08
d
yr
n .18077827304178 5.9774e-10 deg/d
Q 3.783458753300195 8.34e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3021  
   data-arc span      57334 days (156.97 yr)  
   first obs. used      1863-11-20  
   last obs. used      2020-11-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52077  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:50:40  

Additional Information
 Earth MOID = 1.4218 au 
 Jupiter MOID = 1.66956 au 
 T_jup = 3.182 
[ hide covariance matrix ]
Orbital Elements at Epoch 2454902.5 (2009-Mar-12.0) TDB
Reference: JPL 85 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2298198588549133 3.4311e-08  
q 2.38350194269609 1.0694e-07 au
tp 2455271.497915827339
(2010-Mar-15.99791583)
3.9295e-05 TDB
node 286.1291149696872 7.0328e-05 deg
peri 109.7139947037703 7.0729e-05 deg
i 3.178114424930695 3.566e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3021  
   data-arc span      57334 days (156.97 yr)  
   first obs. used      1863-11-20  
   last obs. used      2020-11-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52077  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 01:50:40  

Additional Information
 Jupiter MOID = 1.66956 au 
 T_jup = 3.182 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.177211570175284E-15 -3.665355537681659E-15 -7.261852128218935E-14 1.378145984410022E-16 -1.73882762803751E-14 -3.004967253092523E-17
q -3.665355537681659E-15 1.143641879018335E-14 3.1328969604352E-13 3.812558665611324E-15 6.7450699198561E-14 2.300163852356201E-16
tp -7.261852128218935E-14 3.1328969604352E-13 1.544112690006243E-9 5.167330090618629E-12 3.121778746356326E-10 5.714470492938352E-13
node 1.378145984410022E-16 3.812558665611324E-15 5.167330090618629E-12 4.946042351148937E-9 -4.937998041282765E-9 -2.953167742045856E-11
peri -1.73882762803751E-14 6.7450699198561E-14 3.121778746356326E-10 -4.937998041282765E-9 5.002551741315268E-9 2.95432811401207E-11
i -3.004967253092523E-17 2.300163852356201E-16 5.714470492938352E-13 -2.953167742045856E-11 2.95432811401207E-11 1.27161032314068E-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. 2020-October); 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.]
[Behrend, R. (2020) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
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

[ show close-approach data ]
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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