ASTEROIDAL OCCULTATION - REPORT FORM

    +------------------------------+  +-------------------------------+
    |            EAON              |  |            IOTA/ES            |
    |                              |  |   INTERNATIONAL OCCULTATION   |
    |     EUROPEAN  ASTEROIDAL     |  |      TIMING  ASSOCIATION      |
    |     OCCULTATION NETWORK      |  |       EUROPEAN SECTION        |
    +------------------------------+  +-------------------------------+

1 DATE:                  2021 Nov 08, 18:37 (UTC)

  STAR:                  UCAC4 364-178898      mv: 12.2 mag
  ASTEROID:              (17754) 1998 DN8      mv: 18.4 mag  (diam. 15.0 km)
                         combined magnitude:   mv: 12.2 mag
                         delta-magnitude:      mv:  6.2 mag

2 OBSERVER:
  Name:                  Peter Englmaier
  E-mail:                peter@englmaier.ch
  Address:               Furttalstrasse 97, 8046 Zurich, Switzerland

3 OBSERVING STATION:
  Nearest city:          Zurich
  Station:               Private Observatory
  Latitude:              N47 25' 21.144" (WGS84)
  Longitude:             E08 29' 42.932" (WGS84)
  Altitude:              467 m (MSL)  (WGS84)
  
  Predicted observation: yes (Distance 8.1 km from C.L.)
                         Probability: 45.1 percent

  Single station:        yes

                         +----------------------------------+
4 TIMING OF EVENT:       |                                  |
                         |  OCCULTATION RECORDED: POSITIVE  |
                         |                                  |
                         +----------------------------------+
  Type of event:
   S = Start observation I = Interrupt-start   D = Disappearance
   B = Blink             F = Flash             E = End observation
   I = Interrupt-end     R = Reappearance
   M = Mid-event         P = Predicted time

  Event  Time (UTC)      Acc.         Comments
  Code   HH MM SS.sss    S.sss

   S     18 35 35.059    +/-  0.001 s  : Start observation (UTC)
   D     18 37 38.261    +/-   *    s  : Disappearance     (UTC)
   R     18 37 38.821    +/-   *    s  : Reappearance      (UTC)
   E     18 39 38.380    +/-  0.001 s  : End observation   (UTC)

   Duration:    0.560    +/-   *    s  : (predicted: max. 0.6 s)
   M     18 37 38.541    +/-   *    s  : Mid-event         (UTC)       
   P     18 37 37.000    +/-  0.900 s  : Predicted time    (UTC)

* Accurancy as per the confidence intervals from PyOTE: 

nominal magDrop: > 2.41
snr: 4.31

D time: [18:37:38.2606]
D: 0.6800 confidence intervals:  {+/- 0.0266} seconds
D: 0.9500 confidence intervals:  {+/- 0.0676} seconds
D: 0.9973 confidence intervals:  {+/- 0.1677} seconds

R time: [18:37:38.8210]
R: 0.6800 confidence intervals:  {+/- 0.0266} seconds
R: 0.9500 confidence intervals:  {+/- 0.0676} seconds
R: 0.9973 confidence intervals:  {+/- 0.1677} seconds

Duration (R - D): 0.5604 seconds
Duration: 0.6800 confidence intervals:  {+/- 0.0406} seconds
Duration: 0.9500 confidence intervals:  {+/- 0.0934} seconds
Duration: 0.9973 confidence intervals:  {+/- 0.2086} seconds


5 TELESCOPE: 
  Type:                  Alluna Ritchey-Chrétien f/8 (RC16)
  Aperture:              405 mm, Obstruction 43%
  Focal length:          3240 mm
  Magnification:         focal (resulting field of view: 11.7' in x-axis)
  Mount:                 equatorial, 10micron GM3000 HPS
  Motor drive:           yes

6 TIMING & RECORDING:
  Time source:           GPS
  Quality of signal:     Accuracy 11 m
  Camera/Sensor:         Digital Camera with integrated GPS-VTI (DVTI CAM V3, serial #25)
                         Image Sensor Sony IMX174LLJ-C (1/1.2" 1920x1200 5.86um CIS)
                         Website of the project: https://groups.io/g/d-vti-cam/
  Settings:              480x300, Exposure time 100 ms, Gain +24 dB, Binning 4x4, Format ADV 16-bit
                         without Dark Frame but correction algorithm "Fixed pattern noise red." applied
  Time insertion:        Digital GNSS timestamp into image sensor data stream

7 OBSERVING CONDITIONS:
  Atmospheric transp.:   high clouds, cirrus passing by
  Moon:                  21 percent lit, distance 25 deg
  Wind:                  -
  Star image stability:  fair
  Altitude of star:      20 deg
  Azimut of star:        209 deg in Capricornus

8 ADDITIONAL COMMENTS:
  Feed:                      IBEROC
  Video recording software:  DVTI Cam Control v5.0.0-0
  Light measurement tool:    PyMovie v3.2.5 and PyOTE 4.0.2
  Remarks:

  Published by e-mail to planoccult@ls.vvs.be (Planoccult mailing list)