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JPL Small-Body Database Browser
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249488 (2009 UN129)
Classification: Main-belt Asteroid          SPK-ID: 2249488
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1364095702488024 1.0923e-07  
a 2.674271946524645 3.2733e-08 au
q 2.309475659570789 3.0502e-07 au
i 10.36653367231979 8.1325e-06 deg
node 255.6800332051067 4.3144e-05 deg
peri 264.3377048845538 5.4261e-05 deg
M 52.32594200518704 3.2057e-05 deg
tp 2458768.321856391051
(2019-Oct-11.82185639)
0.00014039 TDB
period 1597.374619475287
4.37
2.9328e-05
8.03e-08
d
yr
n .2253698009288857 4.1378e-09 deg/d
Q 3.0390682334785 3.7198e-08 au
  Orbit Determination Parameters
   # obs. used (total)      255  
   data-arc span      8074 days (22.11 yr)  
   first obs. used      1996-12-31  
   last obs. used      2019-02-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .60408  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-25 10:24:03  

Additional Information
 Earth MOID = 1.34615 au 
 Jupiter MOID = 2.09141 au 
 T_jup = 3.343 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456816.5 (2014-Jun-08.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1376375388187246 1.0901e-07  
q 2.305786021520442 3.0502e-07 au
tp 2457171.345525749457
(2015-May-28.84552575)
0.00012953 TDB
node 255.7478719887651 4.3115e-05 deg
peri 264.5074323107248 5.4058e-05 deg
i 10.37114531828385 8.1375e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      255  
   data-arc span      8074 days (22.11 yr)  
   first obs. used      1996-12-31  
   last obs. used      2019-02-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .60408  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-25 10:24:03  

Additional Information
 Jupiter MOID = 2.09141 au 
 T_jup = 3.343 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.188377985764112E-14 -3.313248457557066E-14 -1.846548541812382E-12 3.800827579452603E-14 2.725286351708732E-13 -3.559303079059564E-14
q -3.313248457557066E-14 9.303544064596203E-14 5.799492845743936E-12 -1.058182544552131E-13 -6.352647437592264E-13 1.021515158067878E-13
tp -1.846548541812382E-12 5.799492845743936E-12 1.67791263804831E-8 -3.572458910370509E-11 4.192095572926241E-9 1.590360615601594E-11
node 3.800827579452603E-14 -1.058182544552131E-13 -3.572458910370509E-11 1.858912139877696E-9 -1.834763342167996E-9 1.279188244871006E-10
peri 2.725286351708732E-13 -6.352647437592264E-13 4.192095572926241E-9 -1.834763342167996E-9 2.922215168269894E-9 -1.242434032948352E-10
i -3.559303079059564E-14 1.021515158067878E-13 1.590360615601594E-11 1.279188244871006E-10 -1.242434032948352E-10 6.621857821442052E-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 16.1   n/a MPO326121  
diameter diameter 4.167 km 0.323 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.044   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

249488 (2009 UN129)          Discovered 2009-Oct-26 by Mt. Lemmon Survey at Mount Lemmon
Reference: 20100824/Numbers.arcLast Updated: 2010-08-27

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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1997-Aug-26 22:59 < 00:01 Juno 0.0488832016667861 0.0488787594138776 0.0488876441370824 8.35100290031396 8.3510028705118 2450687.457908748 0.577550387477075 285.615477161789 95.991853538605 42.0996075254388 54479.2892548561 T 15 CATAB v2.0f-lin.ifort 2020-Feb-25 10:24:06 2020-Feb-25 10:24
2002-Jan-07 22:47 < 00:01 Juno 0.0462237194450651 0.046221210768881 0.0462262282077771 7.98265290546834 7.98265287249721 2452282.449593321 0.569146316960366 194.814377231906 93.1298310552945 -60.8005387113696 67071.248847308 T 15 CATAB v2.0f-lin.ifort 2020-Feb-25 10:24:06 2020-Feb-25 10:24
2045-Aug-11 13:32 00:02 Hebe 0.0349878434406558 0.0349852419933072 0.0349904499640694 9.33141449472214 9.33141447568101 2468204.063944561 1.4945609086863 896.641122143946 86.0306277716418 -83.745255670751 60473.1723353167 T 15 CATAB v2.0f-lin.ifort 2020-Feb-25 10:24:06 2020-Feb-25 10:24
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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