+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   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.DB Last 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 ] 2021-Jan-17 18:11 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin