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15257 (1990 RQ8)
Classification: Main-belt Asteroid          SPK-ID: 2015257
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1729308682841988 5.164e-08  
a 3.138149802696764 1.6442e-08 au
q 2.595466832510525 1.6128e-07 au
i 1.27945900478817 5.1856e-06 deg
node 7.881516352723984 0.00016475 deg
peri 326.0609424234243 0.00016508 deg
M 206.0653871971522 1.3149e-05 deg
tp 2460264.745850808627
(2023-Nov-16.24585081)
7.7147e-05 TDB
period 2030.527771498854
5.56
1.5958e-05
4.369e-08
d
yr
n .1772938075770628 1.3934e-09 deg/d
Q 3.680832772883003 1.9285e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1472  
   data-arc span      11228 days (30.74 yr)  
   first obs. used      1990-09-15  
   last obs. used      2021-06-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52254  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 17:25:58  

Additional Information
 Earth MOID = 1.58479 au 
 Jupiter MOID = 1.6932 au 
 T_jup = 3.188 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457170.5 (2015-May-28.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1699628603484195 5.0929e-08  
q 2.612984705001304 1.5746e-07 au
tp 2456187.072811870069
(2012-Sep-16.57281187)
6.8711e-05 TDB
node 7.915373681807134 0.00016427 deg
peri 324.4623800219372 0.00016463 deg
i 1.28483406886477 5.1724e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1472  
   data-arc span      11228 days (30.74 yr)  
   first obs. used      1990-09-15  
   last obs. used      2021-06-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52254  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 17:25:58  

Additional Information
 Jupiter MOID = 1.6932 au 
 T_jup = 3.188 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.593799415826192E-15 -7.988387328860016E-15 1.416609539185796E-12 6.593554852193462E-15 2.00066822091721E-13 -7.506650496865728E-17
q -7.988387328860016E-15 2.479486066670486E-14 -4.299865648181462E-12 -2.069169956040112E-14 -5.940129445597709E-13 -2.705704335647642E-17
tp 1.416609539185796E-12 -4.299865648181462E-12 4.721203703518388E-9 7.778899082663227E-12 7.673885535811655E-10 -2.920324365121832E-13
node 6.593554852193462E-15 -2.069169956040112E-14 7.778899082663227E-12 2.698330732235317E-8 -2.697563508218399E-8 -2.41436869702719E-10
peri 2.00066822091721E-13 -5.940129445597709E-13 7.673885535811655E-10 -2.697563508218399E-8 2.710390148382506E-8 2.412786023819528E-10
i -7.506650496865728E-17 -2.705704335647642E-17 -2.920324365121832E-13 -2.41436869702719E-10 2.412786023819528E-10 2.675384367780895E-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 14.03   n/a E2021B10  
diameter diameter 8.433 km 0.313 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 6.67 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:
[Chang, C.-K.; Lin, H.-W.; Ip, W.-H.; Prince, T.A.; et al. (2016) Astrophys. J. Sup. Ser. 227, A20.]
geometric albedo albedo 0.075   0.014 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

15257 (1990 RQ8)          Discovered 1990-Sep-15 by Debehogne, H. at La Silla
Reference: 20000621/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1990 RQ8 = 1994 GE3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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