+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   101491 Grahamcrombie (1998 XA) Classification: Main-belt Asteroid          SPK-ID: 2101491 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 18 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3100309118817343 6.4845e-08   a 2.55825958132947 1.7428e-08 au q 1.765120030499711 1.7278e-07 au i 13.76598452442778 6.0838e-06 deg node 85.65270315355582 3.1707e-05 deg peri 306.8348538757512 3.53e-05 deg M 157.6574344303673 1.9335e-05 deg tp 2458545.973408887317 (2019-Mar-03.47340889) 7.462e-05 TDB period 1494.566835061855 4.09 1.5273e-05 4.182e-08 d yr n .2408724665599186 2.4614e-09 deg/d Q 3.35139913215923 2.2831e-08 au   Orbit Determination Parameters    # obs. used (total)      349      data-arc span      7839 days (21.46 yr)      first obs. used      1998-12-01      last obs. used      2020-05-18      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .58879      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 15:37:02   Additional Information  Earth MOID = .808558 au   Jupiter MOID = 2.18015 au   T_jup = 3.329  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 16.01   n/a E2021B55   diameter diameter 3.303 km 0.116 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.077   0.020 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   101491 Grahamcrombie           Discovered 1998 Dec. 1 by I. P. Griffin at Cocoa. Graham William Crombie (1963-2019) was a New Zealand-born chartered accountant. As Chairman of the Otago Museum Trust Board between 2011 and 2019, he championed the construction of the world's southernmost planetarium, which opened in December 2015. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: MPC batch dated 2019-12-12 Last Updated: 2019-12-13 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-21 21:45 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin