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JPL Small-Body Database Browser
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3621 Curtis (1981 SQ1)
Classification: Main-belt Asteroid          SPK-ID: 2003621
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1843061257361078 3.3078e-08  
a 3.10434140276109 1.5119e-08 au
q 2.532192265855999 1.0373e-07 au
i 2.693759708273027 3.8703e-06 deg
node 174.680139450416 6.9143e-05 deg
peri 176.19047457 6.979e-05 deg
M 339.1048338212765 8.7361e-06 deg
tp 2458716.456733088300
(2019-Aug-20.95673309)
4.8331e-05 TDB
period 1997.80291550369
5.47
1.4595e-05
3.996e-08
d
yr
n .1801979550666718 1.3164e-09 deg/d
Q 3.676490539666181 1.7906e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2423  
   data-arc span      24660 days (67.52 yr)  
   first obs. used      1952-05-24  
   last obs. used      2019-11-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4985  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 21:33:04  

Additional Information
 Earth MOID = 1.52551 au 
 Jupiter MOID = 1.75789 au 
 T_jup = 3.193 
[ show covariance matrix ]

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 12.6   n/a MPO431538  
diameter diameter 15.661 km 0.181 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 39.001 h n/a LCDB (Rev. 2019-January); 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 0.079   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

3621 Curtis (1981 SQ1)          Discovered 1981-Sep-26 by Thomas, N. G. at Flagstaff (AM)
Discovered at the Anderson Mesa station, which is operated by the Lowell Observatory.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1981 SQ1 = 1970 QH1 = 1979 KS = 1981 VB1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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