IOTA/IOTA-ES occultation update for
        (15788) 1993 SB / UCAC2 36757563 event on 2009 Dec 06, 15:50 UT
                                  Visible from 


Summary
-------
On 2009 Dec 06 UT, the 127 km diameter asteroid (15788) 1993 SB will occult a
13.0 mag star in the constellation Aries for observers along a path across .

In the case of an occultation, the combined light of the asteroid and the star
will drop by 9.3 mag to 22.3 mag (the magnitude of the asteroid) for at most 7.5
seconds.

This update is based on historical astrometry from the MPC files (via AstDys),
and the following catalogs for the star position: UCAC.

The event at a glimpse
----------------------
    * Rank: 0
    * date and approx. time of event: 2009 Dec 06, 15:50  - 2009 Dec 06, 15:50  UT
    * magnitude of target star: 13.0
    * magnitude drop [mag]: 9.3
    * estimated maximum duration [s]: 7.5
    * Moon: 76 % sunlit, 98° distance
    * Sun: 141° distance
    * rough path description: 

The occultation path
--------------------
    * approximate projected width [km]: 127
    * 1 sigma uncertainty interval [path widths]: +/- 167.28
    * 1 sigma uncertainty interval [seconds]: +/- 8751.0
    * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 7.173 +/- 2.900)
    * 1 sigma uncertainty ellipse (major, minor, PA): ( 7.683", .995", 69° )
    * approx speed of asteroid's shadow [km/s]: 16.9724
    * website for maps:
          http://www.asteroidoccultation.com

Path Coordinates:
   Path does not land on Earth.
 

Data for the target star
------------------------
 * name: UCAC2 36757563
 * constellation : Aries
 * J2000 position with proper motion  to date of event [h,m,s ; °,',"]
        RA: 02 09 42.9592  DE: +14 29 37.211
 * position source: mpos:UCAC2 pm:UCAC2
 * standard error: RA,DE ["]: ( .063, .058 )
 * V mag [mag]: 13.0
 * B mag [mag]: 0.0
 * remarks:

Data for the minor planet
-------------------------
 * general information:
     (number) name: (15788) 1993 SB
     approx. diameter [km]: 127
     approx. diameter ["]: .006
     distance from Earth [AU]: 27.39000

 * orbital information:
      orbit source: Preston
      date of fit: 2008 Mar 20
      source of used astrometry: MPC (via Astdys)
      number of used observations: 50
      number of rejected observations: 0
      time covered by the observations: 1993 Sep 16 - 2000 Oct 20
      1 sigma uncertainty ellipse (major, minor, PA): 7.683, 0.993, 69°
      remarks: 

 * orbital elements for (15788) 1993 SB :
      Mean anomaly       = 341.42621559 deg
      Arg. of pericenter =  78.63928693 deg
      Long. of node      = 354.75847135 deg
      Inclination        =   1.93530007 deg
      Eccentricity       =   0.32158377
      Semimajor axis     =  39.48005923 AU
      Perihelion dist    =  26.78391299 AU
      Mag:             H = 7.71,  G = 0.15
      Epoch of elements  : MJD   55171.66000000 TDT
                           (2009 Dec 06.660)

------ occelmnt file for Occult  BEGIN -----------------------------------
 2009 Dec  6
 15788 1993 SB        
14h 50.7m UT
  13.0    2  9 42.959 14 29 37.21UCAC2 36757563         0.0
22.3    127    7.5  27.390    -0.198     -1.08
  94.2230  14.494   -44.89  -22.55
 14.8454  0.50145 -1.33655 -8.96808 -3.36814  0.00371  0.00120
2000    341.419621200912 5.00000 78.639287354.758471  1.9353000.3215837739.480059226.7839129 7.7 5.00.15
RATE 0.0397310 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000
Meas  7.683 0.995    69168.28 1.069 0                                      54545.5020091206_757563
------ occelmnt file for Occult  END   -----------------------------------

============================================
Calculator (s): Steve Preston
Date of update: 2008 Mar 20, 17:32 UT

Steve Preston
7640 NE 32nd St
Medina, WA 98039
425-688-9965

mailto: stevepr@acm.org