+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   2554 Skiff (1980 OB) Classification: Main-belt Asteroid          SPK-ID: 2002554 [ 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 36 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1450708292162866 3.0911e-08   a 2.263371052378309 7.1649e-09 au q 1.935021936985648 7.188e-08 au i 4.860474978257033 3.7604e-06 deg node 296.3659588307517 3.8237e-05 deg peri 333.9502216681108 4.0437e-05 deg M 288.5800440425294 1.3303e-05 deg tp 2459247.245442523531 (2021-Feb-01.74544252) 4.6137e-05 TDB period 1243.74704685294 3.41 5.9058e-06 1.617e-08 d yr n .2894479234430426 1.3744e-09 deg/d Q 2.59172016777097 8.2043e-09 au   Orbit Determination Parameters    # obs. used (total)      2671      data-arc span      24425 days (66.87 yr)      first obs. used      1953-09-16      last obs. used      2020-07-31      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .41306      source      ORB      producer      Otto Matic      solution date      2020-Aug-24 22:53:25   Additional Information  Earth MOID = .920191 au   Jupiter MOID = 2.50819 au   T_jup = 3.599  [ hide covariance matrix ] Orbital Elements at Epoch 2456922.5 (2014-Sep-22.0) TDB Reference: JPL 36 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1454893329263336 3.0894e-08   q 1.934284609271824 7.1891e-08 au tp 2456759.375533130194 (2014-Apr-11.87553313) 4.5629e-05 TDB node 296.4308721556291 3.8218e-05 deg peri 333.9032316950207 4.0411e-05 deg i 4.86179647425691 3.7615e-06 deg   Orbit Determination Parameters    # obs. used (total)      2671      data-arc span      24425 days (66.87 yr)      first obs. used      1953-09-16      last obs. used      2020-07-31      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .41306      source      ORB      producer      Otto Matic      solution date      2020-Aug-24 22:53:25   Additional Information  Jupiter MOID = 2.50819 au   T_jup = 3.599  Orbit Covariance (6×6)   e q tp node peri i e 9.544190048101242E-16 -2.213541448912749E-15 4.148495391637756E-13 -3.460263791482099E-16 1.167099728075828E-13 2.085375091052994E-16 q -2.213541448912749E-15 5.168295418444936E-15 -9.664370587019043E-13 8.445711383116421E-16 -2.712996423099768E-13 -3.60029324185845E-16 tp 4.148495391637756E-13 -9.664370587019043E-13 2.081991974151195E-9 -4.685261059243973E-12 6.083818053247457E-10 1.835772384630024E-13 node -3.460263791482099E-16 8.445711383116421E-16 -4.685261059243973E-12 1.46058366489914E-9 -1.456130170099968E-9 2.847278514783022E-11 peri 1.167099728075828E-13 -2.712996423099768E-13 6.083818053247457E-10 -1.456130170099968E-9 1.633022589206453E-9 -2.831969552031968E-11 i 2.085375091052994E-16 -3.60029324185845E-16 1.835772384630024E-13 2.847278514783022E-11 -2.831969552031968E-11 1.414922828158811E-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 12.8   n/a MPO502177   diameter diameter 6.005 km 0.052 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 273. h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Skiff, B.A. (2017) Posting on CALL web site: http://www.minorplanet.info/call.html] geometric albedo albedo 0.334   0.139 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)   2554 Skiff (1980 OB)          Discovered 1980-Jul-17 by Bowell, E. 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  1980 OB = 1931 AB = 1970 RE = 1976 GK8 = 1976 HV  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-17 07:00 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin