+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   2527 Gregory (1981 RE) Classification: Main-belt Asteroid          SPK-ID: 2002527 [ 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 38 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1848283864033181 2.8636e-08   a 2.465447641391389 6.4884e-09 au q 2.009762932071152 7.005e-08 au i 2.614824772587173 3.2753e-06 deg node 186.2151605949608 5.8447e-05 deg peri 177.6660938849508 5.8943e-05 deg M 352.9410757013664 7.4146e-06 deg tp 2459028.225419525167 (2020-Jun-27.72541953) 2.9144e-05 TDB period 1413.976210368523 3.87 5.5818e-06 1.528e-08 d yr n .2546011717595826 1.0051e-09 deg/d Q 2.921132350711626 7.6876e-09 au   Orbit Determination Parameters    # obs. used (total)      2965      data-arc span      24151 days (66.12 yr)      first obs. used      1954-10-03      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .44465      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 02:06:53   Additional Information  Earth MOID = 1.00756 au   Jupiter MOID = 2.53828 au   T_jup = 3.462  [ 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 13.2   n/a MPO279540   diameter diameter 13.114 km 3.581 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)   rotation period rot_per 6.1025 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Pravec, P.; Wolf, M.; Sarounova, L. (2008) http://www.asu.cas.cz/~ppravec/neo.htm] [Chang, C.K.; Ip, W.-H.; Lin, H.-W.; Cheng, Y.C.; et al. (2015) Astrophys. J. Supp. Ser. 219, A27.] [Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.] [Chang, C.-H.; Lin, H.-W.; Ip, W.-H.; Chen, W.-P.; et al. (2019) Ap. J. Supp. Ser. 241, A6.] [Erasmus, N.; Navarro-Meza, S.; McNeill, A.; Trilling, D.E.; et al. (2020) Ap. J. Suppl. Ser. 247, A13.] geometric albedo albedo 0.050   0.044 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2017AJ....154..168M)   SMASSII spectral type spec_B B   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) 2527 Gregory (1981 RE)          Discovered 1981-Sep-03 by Thomas, N. G. at Flagstaff (AM) Discovered at the Anderson Mesa station, which is operated by the Lowell Observatory. Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1981 RE = 1950 RE1 = 1954 TA = 1954 UT = 1962 WU1 = 1977 RK1 = 1980 KC = 1981 TR2  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-21 19:18 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin