IOTA ASTEROIDAL OCCULTATION REPORT FORM

Asteroid (or other object):HIMALIA  Star: UCAC4 371-069226 

Date (U.T.):2018 May 20  Predicted Time (U.T.):22:18

Observer Name: Marek Zawilski 

Postal Address: 91-473 Lodz, Poland

TELESCOPE:  Aperture: 203mm  Focal length:2032 mm, reduced to 1016 mm  Type:Celestron

    Eyepiece Power:________  Observing site name: Tobolice (35 km N-W from Lodz)

    Longitude: 19d 03'22.4" E Latitude:51d 54'48.3" N

    Height above sealevel:140 m  How determined?:GPS measurements

Sky Transparency (Circle one, or delete two):     Good   

Star Image Stability ("seeing"; as above):        Fair  

Other Conditions:  (Wind, Clouds, Lights, etc.): none

EVENT TIMINGS:  (All times in Universal Time)

Time Source:synchronized computer time (every 2 minutes) using DIMENSION 4 software; time server GUM Warsaw (official one) applied; Recording method: digital ZWO ASI 120 MM camera

Was the Asteroid Visible in your Scope? no  Approx. Limiting Mag.:13

                               Universal Time  Estimated  Accuracy, Remarks
                                 h   m    s    Reaction
                                                Time,
  Started Observing:           22:16:___.___  (sec.)  ____________________

  Star and Object Merged:      ___:___:___.___          ____________________

  Disappearance:               22:17:56.18  __.___  the first frame without the star; the timing not very precise, some frames lost before the event, most probable time is around 56.1s

  Estimated Closest Approach:  ___:___:___.___          ____________________
                  (if no D/R)
  Reappearance:                22:18:03.69  __.___  with the maximum error of about 0.07s; all frames recoreded.

  Star and Object Separated:   ___:___:___.___          ____________________

  Stopped Observing:           22:20:___.___          ____________________

  Was your reaction time applied to the above timings? no (not necessary)

If you could tell, did the object pass NORTH, SOUTH, EAST, or WEST of the
star (cicle one, or delete three)?  If possible,
estimate the distance of closest approach in arc seconds: _______

List all Interruptions in Observing:           Reason

    From  ___:___:___  to  ___:___:___    __________________________________

    From  ___:___:___  to  ___:___:___    __________________________________

Additional comments: the first use of this digital camera, time resolution of 0.05 s due to the low star magnitude and the capacity of direct video stream 
with the used compromise image resolution of 640x480 pixels; the delay of the computer time found directly before the observation as +0.06 s (+-0.02s) in comparison with IOTA VTI 

email
report to:   reports@asteroidoccultation.com