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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 
[ 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] (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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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 1.94433291360515 1.94433242331787 1.94433340389232 2.83000896316885 2.67164323916735 2432898.693267135 0.565159935485146 43.5150512581464 14.6881094702334 88.9094438254768 2606905.94613467 T 84 CATAB v2.0f-lin.ifort 2020-Nov-13 04:34:06 2020-Nov-13 04:34
1958-Oct-03 10:45 < 00:01 Jupiter 1.66378028607131 1.66377992945633 1.66378064268857 1.07293251888949 0.364683205259907 2436479.947819031 0.483386230731446 3194.28761151234 461.680661335077 0.792310272535587 1650558.07329259 T 84 CATAB v2.0f-lin.ifort 2020-Nov-13 04:34:06 2020-Nov-13 04:34
2018-Dec-14 15:34 < 00:01 Jupiter 1.68970325418191 1.68970290163735 1.68970360672648 1.50558589902013 1.12437509269288 2458467.148794149 0.236762250936549 132.668652248566 58.2708049858751 30.3688455500669 2581506.23658353 T 84 CATAB v2.0f-lin.ifort 2020-Nov-13 04:34:06 2020-Nov-13 04:34
2028-Sep-28 06:57 < 00:01 Jupiter 1.85075608878067 1.85075565657641 1.85075652098525 1.56970694841377 1.24444926671864 2462042.789419391 0.303303003959218 86.4798535518508 51.7866072137567 -53.6323581248418 2699755.7423729 T 84 CATAB v2.0f-lin.ifort 2020-Nov-13 04:34:06 2020-Nov-13 04:34
2079-Feb-26 08:17 < 00:01 Jupiter 1.83365475399115 1.8336542841681 1.83365522381408 2.29698286642854 2.08620892958647 2480455.845083385 0.688391277502129 51.9092606069843 12.150909929166 84.200995327069 2463760.99018011 T 84 CATAB v2.0f-lin.ifort 2020-Nov-13 04:34:06 2020-Nov-13 04:34
2088-Dec-15 23:17 < 00:01 Jupiter 1.69405113754678 1.69405070781686 1.69405156727583 1.10213281073205 0.463357676992156 2484036.469847548 0.789475119419602 1473.4808931848 365.924245827892 -4.33762689049482 1778865.25486339 T 84 CATAB v2.0f-lin.ifort 2020-Nov-13 04:34:06 2020-Nov-13 04:34
2149-Feb-27 01:10 00:01 Jupiter 1.64622633912477 1.6462259928016 1.64622668544967 1.31307367214059 0.833735575121969 2506023.548908033 1.30458823033639 381.772561723931 109.554200472597 24.7328697890985 2497549.14686767 T 84 CATAB v2.0f-lin.ifort 2020-Nov-13 04:34:06 2020-Nov-13 04:34
2158-Dec-11 18:18 00:01 Jupiter 1.95652226858439 1.95652146348494 1.95652307368474 2.02038744131492 1.79335451290216 2509598.262262336 1.42020084487954 100.708504769506 16.9589047928845 -82.8704196685155 2592632.11466441 T 84 CATAB v2.0f-lin.ifort 2020-Nov-13 04:34:06 2020-Nov-13 04:34

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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