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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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1846010461486798 1.9985e-08  
a 3.105953073923588 1.2549e-08 au
q 2.532590887188586 6.3481e-08 au
i 2.693501272895997 3.8139e-07 deg
node 174.6672827053278 1.1201e-05 deg
peri 176.3440302081226 1.0581e-05 deg
M 87.05509942880295 4.4025e-06 deg
tp 2458717.015587659218
(2019-Aug-21.51558766)
2.284e-05 TDB
period 1999.35890699924
5.47
1.2117e-05
3.317e-08
d
yr
n .1800577168710094 1.0912e-09 deg/d
Q 3.67931526065859 1.4865e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2858  
   data-arc span      25131 days (68.80 yr)  
   first obs. used      1952-05-24  
   last obs. used      2021-03-14  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4682  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 15:20:17  

Additional Information
 Earth MOID = 1.52511 au 
 Jupiter MOID = 1.75974 au 
 T_jup = 3.192 
[ 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 12.68   n/a E2021B10  
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. 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 0.079   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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