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JPL Small-Body Database Browser
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17981 (1999 JZ56)
Classification: Main-belt Asteroid          SPK-ID: 2017981
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 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07417587779435234 3.0734e-08  
a 3.159747923400835 1.5899e-08 au
q 2.925370847573696 9.7742e-08 au
i 1.500166619117502 3.564e-06 deg
node 42.64116803856665 0.00014771 deg
peri 47.18888982914073 0.0001502 deg
M 50.81665624513725 2.6673e-05 deg
tp 2458710.911929891144
(2019-Aug-15.41192989)
0.00015186 TDB
period 2051.526269974998
5.62
1.5484e-05
4.239e-08
d
yr
n .1754791080517761 1.3245e-09 deg/d
Q 3.394124999227974 1.7078e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2257  
   data-arc span      14776 days (40.45 yr)  
   first obs. used      1979-11-14  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49611  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 04:43:27  

Additional Information
 Earth MOID = 1.94216 au 
 Jupiter MOID = 1.74706 au 
 T_jup = 3.200 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456858.5 (2014-Jul-20.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07480620090319215 3.0943e-08  
q 2.926507421193155 9.9115e-08 au
tp 2456671.829090331266
(2014-Jan-14.32909033)
0.00014964 TDB
node 42.70139702990033 0.00014769 deg
peri 49.35125755933194 0.0001501 deg
i 1.500408099665296 3.5618e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2257  
   data-arc span      14776 days (40.45 yr)  
   first obs. used      1979-11-14  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49611  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 04:43:27  

Additional Information
 Jupiter MOID = 1.74706 au 
 T_jup = 3.200 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.574854445201784E-16 -3.032717247117446E-15 4.369943489312078E-13 2.194296845136295E-15 7.839682974233477E-14 -1.042518262837833E-16
q -3.032717247117446E-15 9.823738696817405E-15 -1.564443070697696E-12 -4.828061828413778E-15 -2.801132563961248E-13 2.837501337498777E-16
tp 4.369943489312078E-13 -1.564443070697696E-12 2.239158278681793E-8 -7.235999238844497E-12 4.031432411539816E-9 -2.863453257617191E-13
node 2.194296845136295E-15 -4.828061828413778E-15 -7.235999238844497E-12 2.181137129597549E-8 -2.180480694599814E-8 -5.624110192497816E-11
peri 7.839682974233477E-14 -2.801132563961248E-13 4.031432411539816E-9 -2.180480694599814E-8 2.252852096740866E-8 5.616717075816542E-11
i -1.042518262837833E-16 2.837501337498777E-16 -2.863453257617191E-13 -5.624110192497816E-11 5.616717075816542E-11 1.268627688934491E-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 13.2   n/a MPO384908  
diameter diameter 9.965 km 0.260 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 3.134 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.070   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

17981 (1999 JZ56)          Discovered 1999-May-10 by LINEAR at Socorro
Reference: 20001013/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 JZ56 = 1979 VV2 = 1990 TV7 = 1998 FK20 = 2000 NP25 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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