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21580 Portalatin (1998 SY57)
Classification: Main-belt Asteroid          SPK-ID: 2021580
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06110464858451588 9.8654e-09  
a 2.896596448939 1.1235e-08 au
q 2.719600940835426 3.3615e-08 au
i 3.048792061236866 3.0336e-07 deg
node 76.44790054515934 4.0905e-06 deg
peri 240.6254137378767 2.2363e-05 deg
M 262.7827253422588 2.4187e-05 deg
tp 2459882.763149989141
(2022-Oct-30.26314999)
0.00012136 TDB
period 1800.654612180609
4.93
1.0476e-05
2.868e-08
d
yr
n .1999272917553227 1.1632e-09 deg/d
Q 3.073591957042574 1.1922e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2835  
   data-arc span      11117 days (30.44 yr)  
   first obs. used      1991-02-20  
   last obs. used      2021-07-29  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46493  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 15:01:23  

Additional Information
 Earth MOID = 1.70701 au 
 Jupiter MOID = 2.09954 au 
 T_jup = 3.284 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.33   n/a MPO636388  
diameter diameter 6.218 km 0.350 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 3.627 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.240   0.040 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21580 Portalatin           Discovered 1998 Sept. 17 by the Lowell Observatory Near-Earth Object Search at the Anderson Mesa Station.
Wilfredo Portalatin (b. 1949), staff technician and telescope operator at the Arecibo Observatory, has played a key role in numerous radar experiments on minor planets since the 1970s.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20080718/MPCPages.arcLast Updated: 2008-07-18

Alternate Designations
 1998 SY57 = 1999 XJ100 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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