+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   27085 (1998 UA1) Classification: Main-belt Asteroid          SPK-ID: 2027085 [ 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 23 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1733617595490073 3.3286e-08   a 2.309180889170617 5.7342e-09 au q 1.908857227107057 7.776e-08 au i 4.861502345953324 4.1296e-06 deg node 49.57673531512211 4.3269e-05 deg peri 15.20027938808666 4.5415e-05 deg M 90.38624416914183 1.2568e-05 deg tp 2458878.700623355528 (2020-Jan-30.20062336) 4.4633e-05 TDB period 1281.696973437921 3.51 4.7741e-06 1.307e-08 d yr n .2808776235418306 1.0462e-09 deg/d Q 2.709504551234176 6.7283e-09 au   Orbit Determination Parameters    # obs. used (total)      1426      data-arc span      14799 days (40.52 yr)      first obs. used      1980-07-12      last obs. used      2021-01-17      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .52029      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 03:22:59   Additional Information  Earth MOID = .922067 au   Jupiter MOID = 2.60071 au   T_jup = 3.561  [ hide covariance matrix ] Orbital Elements at Epoch 2456832.5 (2014-Jun-24.0) TDB Reference: JPL 23 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1727591477171105 3.3289e-08   q 1.910166735274619 7.7694e-08 au tp 2456313.151270823433 (2013-Jan-20.65127082) 4.5172e-05 TDB node 49.60930027609702 4.3252e-05 deg peri 14.79431785503628 4.5432e-05 deg i 4.863452789875733 4.1311e-06 deg   Orbit Determination Parameters    # obs. used (total)      1426      data-arc span      14799 days (40.52 yr)      first obs. used      1980-07-12      last obs. used      2021-01-17      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .52029      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 03:22:59   Additional Information  Jupiter MOID = 2.60071 au   T_jup = 3.561  Orbit Covariance (6×6)   e q tp node peri i e 1.108151635381494E-15 -2.581719589059391E-15 -5.174425910277756E-13 -7.92607177948372E-15 -1.462904623134152E-13 -2.187461129331449E-16 q -2.581719589059391E-15 6.036341694506408E-15 1.171812522896619E-12 1.815471197141109E-14 3.334935345259702E-13 6.152669612010095E-16 tp -5.174425910277756E-13 1.171812522896619E-12 2.040474446404624E-9 1.03151556747569E-11 6.385238064628341E-10 -1.097561464319565E-12 node -7.92607177948372E-15 1.815471197141109E-14 1.03151556747569E-11 1.870712113407232E-9 -1.860264835837042E-9 -5.442787119832892E-11 peri -1.462904623134152E-13 3.334935345259702E-13 6.385238064628341E-10 -1.860264835837042E-9 2.064066946129395E-9 5.389562335817687E-11 i -2.187461129331449E-16 6.152669612010095E-16 -1.097561464319565E-12 -5.442787119832892E-11 5.389562335817687E-11 1.706604739485609E-11 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 15.10   n/a E2021B10   diameter diameter 3.551 km 0.224 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.128   0.022 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   27085 (1998 UA1)          Discovered 1998-Oct-19 by Stafford, T. at Zeno Reference: 20010804/Numbers.arc Last Updated: 2004-04-19 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Mar-01 20:52 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin