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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 ]

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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 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1844911844646954 3.3092e-08  
a 3.105141680497606 1.497e-08 au
q 2.532270413931907 1.0381e-07 au
i 2.693543398497203 3.8618e-06 deg
node 174.6760824582247 6.8144e-05 deg
peri 176.2685527001811 6.8796e-05 deg
M 51.11215923136893 8.512e-06 deg
tp 2458716.745808517979
(2019-Aug-21.24580852)
4.7625e-05 TDB
period 1998.575494944738
5.47
1.4453e-05
3.957e-08
d
yr
n .1801282968347184 1.3026e-09 deg/d
Q 3.678012947063304 1.7732e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2484  
   data-arc span      24699 days (67.62 yr)  
   first obs. used      1952-05-24  
   last obs. used      2020-01-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48954  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-28 19:09:12  

Additional Information
 Earth MOID = 1.52652 au 
 Jupiter MOID = 1.76016 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-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 0.079   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

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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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