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85774 (1998 UT18)
Classification: Apollo [NEO, PHA]          SPK-ID: 2085774
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 161 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3291183900409435 1.0437e-08  
a 1.402899507075806 4.0657e-10 au
q .9411794799177836 1.4675e-08 au
i 13.58886606682922 7.0786e-06 deg
node 64.6541691151494 5.4612e-06 deg
peri 50.11949882420836 7.2128e-06 deg
M 309.6965996730072 1.7956e-06 deg
tp 2459085.307275780701
(2020-Aug-23.80727578)
3.0425e-06 TDB
period 606.9295332440922
1.66
2.6384e-07
7.224e-10
d
yr
n .5931495837346521 2.5785e-10 deg/d
Q 1.864619534233829 5.4038e-10 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -6.466056945277172E-15 1.519E-15
ALN [SET] 1. n/a
NK [SET] 0. n/a
NM [SET] 2. n/a
R0 [SET] 1. n/a
  Orbit Determination Parameters
   # obs. used (total)      729  
   # delay obs. used      4  
   # Doppler obs. used      4  
   data-arc span      10996 days (30.11 yr)  
   first obs. used      1989-04-30  
   last obs. used      2019-06-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43626  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Aug-09 07:03:10  

Additional Information
 Earth MOID = .0359659 au 
 Jupiter MOID = 3.30049 au 
 T_jup = 4.662 
 Nongravitational accels. using nonstandard g(r) = (1 au/ r)^2 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456722.5 (2014-Mar-06.0) TDB
Reference: JPL 161 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3290489763722563 1.0417e-08  
q .9415012163682799 1.4604e-08 au
tp 2456656.857513356454
(2013-Dec-30.35751336)
2.8931e-06 TDB
node 64.68338894582483 5.4603e-06 deg
peri 50.05680003885545 7.2157e-06 deg
i 13.5899882846927 7.0793e-06 deg

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -6.466056945277172E-15 1.519E-15
ALN [SET] 1. n/a
NK [SET] 0. n/a
NM [SET] 2. n/a
R0 [SET] 1. n/a
  Orbit Determination Parameters
   # obs. used (total)      729  
   # delay obs. used      4  
   # Doppler obs. used      4  
   data-arc span      10996 days (30.11 yr)  
   first obs. used      1989-04-30  
   last obs. used      2019-06-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43626  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Aug-09 07:03:10  

Additional Information
 Jupiter MOID = 3.30049 au 
 T_jup = 4.662 
 Nongravitational accels. using nonstandard g(r) = (1 au/ r)^2 
Orbit Covariance (7×7)
  e q tp node peri i A2
e 1.085048323197897E-16 -1.521228549324663E-16 3.500581395707642E-15 1.758617980678597E-14 -1.347242716018413E-15 4.327045719797426E-15 -3.737059203000537E-24
q -1.521228549324663E-16 2.132818953833837E-16 -4.949485318034349E-15 -2.447907900219098E-14 1.664847722564742E-15 -6.297845193661117E-15 5.32826619813347E-24
tp 3.500581395707642E-15 -4.949485318034349E-15 8.369989343119122E-12 -7.44951801666072E-12 1.631159789679282E-11 -2.251492948759429E-12 1.348054846035153E-21
node 1.758617980678597E-14 -2.447907900219098E-14 -7.44951801666072E-12 2.981445155240975E-11 -3.550972624452321E-11 -1.112468228473073E-11 1.744709481789028E-21
peri -1.347242716018413E-15 1.664847722564742E-15 1.631159789679282E-11 -3.550972624452321E-11 5.206601839669416E-11 9.923141258452043E-12 -9.274704197913212E-22
i 4.327045719797426E-15 -6.297845193661117E-15 -2.251492948759429E-12 -1.112468228473073E-11 9.923141258452043E-12 5.011652963198983E-11 -8.20712858578613E-21
A2 -3.737059203000537E-24 5.32826619813347E-24 1.348054846035153E-21 1.744709481789028E-21 -9.274704197913212E-22 -8.20712858578613E-21 2.306853998714962E-30

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 19.1   n/a MPO474743  
diameter diameter 0.939 km 0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)  
rotation period rot_per 55. h n/a LCDB (Rev. 2019-August); 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:
[Pravec, P.; Wolf, M.; Sarounova, L. (2019) http://www.asu.cas.cz/~ppravec/neo.htm]
geometric albedo albedo 0.042   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)  
SMASSII spectral type spec_B C   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)

85774 (1998 UT18)          Discovered 1998-Oct-27 by CSS at Catalina
Reference: 20040830/Numbers.arcLast Updated: 2004-09-06

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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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