IOTA/IOTA-ES occultation update for
         (0) 2007 TH422 / UCAC2 34047756 event on 2012 Nov 30, 22:39 UT
                        Visible from Maybe Africa, Europe


Summary
-------
On 2012 Nov 30 UT, the 95 km diameter asteroid (0) 2007 TH422 will occult a 12.8
mag star in the constellation Taurus for observers along a path across Maybe
Africa, Europe.

In the case of an occultation, the combined light of the asteroid and the star
will drop by 9.4 mag to 22.2 mag (the magnitude of the asteroid) for at most 3.8
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: 2012 Nov 30, 22:39  - 2012 Nov 30, 22:39  UT
    * geocentric midpoint of event [JD]: 2456262.4464875
    * magnitude of target star: 12.8
    * magnitude drop [mag]: 9.4
    * estimated maximum duration [s]: 3.8
    * Moon: 95 % sunlit, 29° distance
    * Sun: 165° distance
    * rough path description: Maybe Africa, Europe

The occultation path
--------------------
    * approximate projected width [km]: 95
    * 1 sigma uncertainty interval [path widths]: +/- 369.39
    * 1 sigma uncertainty interval [seconds]: +/- 2178.9
    * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 2.632 +/- 1.926)
    * 1 sigma uncertainty ellipse (major, minor, PA): ( 3.168", .779", 55° )
    * approx speed of asteroid's shadow [km/s]: 24.6595
    * website for maps:
          http://www.asteroidoccultation.com

Path Coordinates:
   Path does not land on Earth.
 

Data for the target star
------------------------
 * name: UCAC2 34047756
 * constellation : Taurus
 * J2000 position with proper motion  to date of event [h,m,s ; °,',"]
        RA: 04 35 22.4411  DE: +06 59 38.967
 * position source: mpos:UCAC2 pm:UCAC2
 * standard error: RA,DE ["]: ( .040, .039 )
 * V mag [mag]: 12.8
 * B mag [mag]: 0.0
 * Diameter [mas]: 0
 * remarks:

Data for the minor planet
-------------------------
 * general information:
     (number) name: (0) 2007 TH422
     approx. diameter [km]: 95
     approx. diameter ["]: .005
     distance from Earth [AU]: 27.74900

 * orbital information:
      orbit source: Preston
      date of fit: 2012 Jul 10
      source of used astrometry: MPC (via Astdys)
      number of used observations: 32
      number of rejected observations: 0
      time covered by the observations: 2007 Oct 03 - 2011 Jan 10
      1 sigma uncertainty ellipse (major, minor, PA): 3.168, 0.778, 55°
      remarks: 

 * orbital elements for (0) 2007 TH422 :
      Mean anomaly       =   8.46592190 deg
      Arg. of pericenter = 313.03171429 deg
      Long. of node      =  96.39529526 deg
      Inclination        =  28.50153660 deg
      Eccentricity       =   0.28178891
      Semimajor axis     =  39.63858122 AU
      Perihelion dist    =  28.46886878 AU
      Mag:             H = 7.72,  G = 0.00
      Epoch of elements  : MJD   56261.94400000 TDT
                           (2012 Nov 30.944)

------ occelmnt file for Occult  BEGIN -----------------------------------
 2012 Nov 30
     0 2007 TH422     
22h 42.9m UT
  12.8    4 35 22.441  6 59 38.97UCAC2 34047756         0.0
22.2     95    3.8  27.749    -0.296     -0.15
  17.9060   6.994  -163.48  -21.82
 22.7157  0.07455 -2.13694-13.90996 -0.48707 -0.00017  0.00158
2000      8.45824420121129.00000313.031714 96.395295 28.5015370.2817889139.638581228.4688686 7.7 5.00.00
RATE 0.0394940 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000
Meas  3.168 0.779    55370.39 1.744 0                               0 1-3 056247.0020121130_047756
------ occelmnt file for Occult  END   -----------------------------------

============================================
Calculator (s): Steve Preston
Date of update: 2012 Jul 10, 03:57 UT

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

mailto: stevepr@acm.org