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JPL Small-Body Database Browser
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15091 Howell (1999 CM136)
Classification: Outer Main-belt Asteroid          SPK-ID: 2015091
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07659896877470382 3.9723e-08  
a 3.226775087540884 2.7126e-08 au
q 2.979607443367347 1.2228e-07 au
i 7.273367890301678 5.7694e-06 deg
node 305.0850416538388 4.0132e-05 deg
peri 312.4124896323916 5.819e-05 deg
M 51.57933497993724 4.2524e-05 deg
tp 2458297.163474829585
(2018-Jun-27.66347483)
0.00024977 TDB
period 2117.149224661881
5.80
2.6697e-05
7.309e-08
d
yr
n .1700399744177191 2.1442e-09 deg/d
Q 3.47394273171442 2.9204e-08 au
  Orbit Determination Parameters
   # obs. used (total)      919  
   data-arc span      8450 days (23.13 yr)  
   first obs. used      1996-10-02  
   last obs. used      2019-11-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55349  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 23:54:19  

Additional Information
 Earth MOID = 1.97015 au 
 Jupiter MOID = 1.65884 au 
 T_jup = 3.170 
[ 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 13.8   n/a MPO452383  
diameter diameter 8.844 km 0.265 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 10.86318 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 sidereal period (not synodic); Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Durech, J.; Hanus, J.; Ali-Lagoa, V. (2018) Astron. Astrophys. 617, A57.]
geometric albedo albedo 0.082   0.013 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

15091 Howell           Discovered 1999 Feb. 9 by Spacewatch at Kitt Peak.
Noted student of cataclysmic variable stars, master of high-precision photometry and explorer of TOADs (tremendous outburst amplitude dwarf novae), Steve B. Howell (b. 1955) is equally at home developing theoretical stellar models, working with the latest instrumentation or mentoring students in esoteric astrophysics.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20030614/MPCPages.arcLast Updated: 2005-04-26

[ show close-approach data ]
Alternate Designations
 1999 CM136 = 1996 TT55 = 1997 WE22 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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