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18376 Quirk (1991 SQ)
Classification: Main-belt Asteroid          SPK-ID: 2018376
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 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2335990935546021 4.3705e-08  
a 2.72498288822217 1.3884e-08 au
q 2.08842935558167 1.1975e-07 au
i 10.5018161528695 4.1991e-06 deg
node 38.62287925492969 2.6054e-05 deg
peri 323.9530785439451 2.7101e-05 deg
M 169.5141610983649 9.17e-06 deg
tp 2458426.844566556105
4.0575e-05 TDB
period 1643.024713895061
n .2191080858099575 1.6746e-09 deg/d
Q 3.361536420862671 1.7127e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1454  
   data-arc span      12117 days (33.17 yr)  
   first obs. used      1988-01-11  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42442  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:27:51  

Additional Information
 Earth MOID = 1.0957 au 
 Jupiter MOID = 2.12743 au 
 T_jup = 3.293 
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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 14.65   n/a E2021B10  
rotation period rot_per 7.66683 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:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]

18376 Quirk           Discovered 1991 Sept. 30 by R. H. McNaught at Siding Spring Observatory.
Steven (Steve) Quirk (b. 1958) is an accomplished astrophotographer whose photographs have appeared in many books and magazines. He has been of immense assistance to the discoverer by volunteering to operate fireball patrol and meteor video cameras.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20040504/MPCPages.arcLast Updated: 2004-05-11

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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
2067-May-07 01:32 00:02 Amphi 0.0407605666194212 0.0407519814269237 0.0407691545324765 4.49556445515999 4.49556442378752 2476142.564066772 2.02912163483529 686.171091097462 87.6919273813553 52.0032065974845 55046.178405208 T 24 CATAB v2.0f-lin.ifort 2021-Apr-13 02:27:56 2021-Apr-13 02:27

Alternate Designations
 1991 SQ = 1988 AK2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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