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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.


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

[ 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
1948-Dec-13 04:38 < 00:01 Jupiter 1.94433291616865 1.94433242706174 1.94433340527544 2.83000901669277 2.67164329607897 2432898.693270832 0.564288483032691 43.4875352927596 14.661295141924 88.9102764321475 2614341.63164961 T 85 CATAB v2.0f-lin.ifort 2020-Dec-18 01:50:48 2020-Dec-18 01:50
1958-Oct-03 10:45 < 00:01 Jupiter 1.66378028886958 1.66377993289695 1.66378064484458 1.07293252860981 0.364683236205884 2436479.947818031 0.482460411506136 3187.7073402053 461.019438348385 0.784460100577425 1653893.80146296 T 85 CATAB v2.0f-lin.ifort 2020-Dec-18 01:50:48 2020-Dec-18 01:50
2018-Dec-14 15:34 < 00:01 Jupiter 1.6897032573074 1.68970290570497 1.68970360890992 1.50558582690929 1.12437499695808 2458467.148779364 0.236579219059605 132.433569060804 58.1426796829707 30.4053185596558 2588224.55309892 T 85 CATAB v2.0f-lin.ifort 2020-Dec-18 01:50:48 2020-Dec-18 01:50
2028-Sep-28 06:57 < 00:01 Jupiter 1.85075609020522 1.85075565819748 1.85075652221328 1.56970707482043 1.24444942644687 2462042.789403053 0.30302761775139 86.4187778290888 51.7117894549299 -53.5855790363626 2701954.19442994 T 85 CATAB v2.0f-lin.ifort 2020-Dec-18 01:50:48 2020-Dec-18 01:50
2079-Feb-26 08:17 < 00:01 Jupiter 1.83365475348593 1.83365428366674 1.83365522330501 2.29698286088718 2.08620892342425 2480455.845077535 0.686623240917603 51.8795863675657 12.1301336900681 84.2271222814738 2464392.90696101 T 85 CATAB v2.0f-lin.ifort 2020-Dec-18 01:50:48 2020-Dec-18 01:50
2088-Dec-15 23:17 < 00:01 Jupiter 1.69405114185362 1.69405071321549 1.69405157049087 1.10213282343551 0.463357709951716 2484036.469841099 0.787647103317538 1471.14632799661 365.254654129149 -4.3594245009053 1782601.64795001 T 85 CATAB v2.0f-lin.ifort 2020-Dec-18 01:50:48 2020-Dec-18 01:50
2149-Feb-27 01:10 00:01 Jupiter 1.64622634146011 1.64622599579558 1.64622668712632 1.3130736580777 0.833735553849392 2506023.548894012 1.30139835803564 381.488990986803 109.35300135279 24.7719181154272 2504001.72146634 T 85 CATAB v2.0f-lin.ifort 2020-Dec-18 01:50:48 2020-Dec-18 01:50
2158-Dec-11 18:18 00:01 Jupiter 1.95652227603636 1.95652147201447 1.95652308005914 2.02038745098007 1.79335452471034 2509598.262254381 1.41699622524769 100.511134075386 16.9216426726738 -82.8787731562672 2596205.15510528 T 85 CATAB v2.0f-lin.ifort 2020-Dec-18 01:50:48 2020-Dec-18 01:50

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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