+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   201 Penelope (A879 PA) Classification: Main-belt Asteroid          SPK-ID: 2000201 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 101 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1792958519243731 2.9026e-08   a 2.678769645859989 6.1299e-09 au q 2.198477360096371 7.5325e-08 au i 5.755755720018072 2.8122e-06 deg node 156.9215618553324 3.5688e-05 deg peri 180.7851445737258 3.7445e-05 deg M 79.25372384764032 1.2523e-05 deg tp 2458847.951673794499 (2019-Dec-30.45167379) 5.5002e-05 TDB period 1601.406107780754 4.38 5.4968e-06 1.505e-08 d yr n .2248024397127422 7.7163e-10 deg/d Q 3.159061931623607 7.2289e-09 au   Orbit Determination Parameters    # obs. used (total)      3158      data-arc span      51661 days (141.44 yr)      first obs. used      1879-08-13      last obs. used      2021-01-21      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .46128      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 00:44:21   Additional Information  Earth MOID = 1.18741 au   Jupiter MOID = 2.23209 au   T_jup = 3.347  [ 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 8.39   n/a E2021B10 IRAS observations used: 14 magnitude slope G 0.24   n/a PDS3 (MPC 17258) Fit diameter diameter 85.877 km 3.141 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 3.7474 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Lagerkvist, C.-I.; Rickman, H.; Scaltriti, F.; Zappala, V. (1981) Astron. Astrophys. 104, 148-149.] [Lagerkvist, C.-I.; Rickman, H. (1981) Moon Planets 24, 437-440.] [Surdej, J.; Louis, R.; Cramer, N.; Rufener, F.; et al. (1983) Astron. Astrophys. Suppl. Ser. 54, 371-378.] [Weidenschilling, S.J.; Chapman, C.R.; Davis, D.R.; Greenberg, R.; et al. (1987) Icarus 70, 191-245.] [Drummond, J.D.; Weidenschilling, S.J.; Chapman, C.R.; Davis, D.R. (1988) Icarus 76, 19-77.] [Magnusson, P. (1990) Icarus 85, 229-240.] [Drummond, J.D.; Weidenschilling, S.J.; Chapman, C.R.; Davis, D.R. (1991) Icarus 89, 44-64.] [Erikson, A.; Magnusson, P. (1993) Icarus 103, 62-66.] [Michalowski, T. (1993) Icarus 106, 563-572.] [De Angelis, G. (1995) Planet. Space Sci. 43, 649-682.] [Michalowski, T. (1996) Icarus 123, 456-462.] [Shevchenko, V.G.; Bel'skaya, I.N.; Krugly, Yu.N.; Chiorny, V.G.; Gaftonyuk, N.M. (2002) Icarus 155, 365-374.] [Tungalag, N.; Shevchenko, V.G.; Lupishko, D.F. (2002) Kin. Fiz. Neb. Tel 18, 508-516; Kinematics and Physics of Celestial Bodies 18, ???-???.] [Torppa, J.; Kaasalainen, M.; Michalowski, T.; Kwiatkowski, T.; et al. (2003) Icarus 164, 346-383.] [Proyecto ECLA (Silvia Alonso Perez) (2011) http://www.geocities.com/proyectoecla/] [Alton, K.B. (2012) Minor Planet Bull. 39, 107-108.] [Hanus, J.; Marchis, F.; Durech, J. (2013) Icarus 226, 1045-1057.] [Behrend, R. (2015) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Mizoguchi, T.; Tanaka, A.; Nakata, A.; Hirono, K.; et a. (2017) Minor Planet Bull. 44, 190.] geometric albedo albedo 0.040   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   B-V BV 0.720   0.021 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=13; phase (min.=4.34, mean=14.75, max.=24.15) deg. U-B UB 0.233   0.017 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=7; phase (min.=4.34, mean=11.63, max.=20.88) deg. Tholen spectral type spec_T M   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo SMASSII spectral type spec_B X   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) 201 Penelope (A879 PA)          Discovered 1879-Aug-07 by Palisa, J. at Pola Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A879 PA = A869 GA  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-07 10:02 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin