ASTEROIDAL OCCULTATION - REPORT FORM
					  -  Preliminary -
    +------------------------------+  +------------------------------+
    +        Lucky-Star				      IOTA-ES			+
    +------------------------------+  +------------------------------+


1 DATE:   12 December 2023           STAR: HIP 27989  

  ASTEROID: Leona                 	N?: 319
 
  PREDICTION FEED:				Lucky-Star

2 OBSERVER: Name:     Tim and Anne HAYMES 
            E-mail: 
		 Address:  Oxfordshire, UK

3 OBSERVING STATION: Nearest city:  Colos, Portugal
  Station  : MOBILE
  Latitude : N 37 43 25".4		37.72371
  Longitude: W 08 24 07".6		-8.40209
  Altitude : 168 m
  Datum (WGS84 preferred): WGS84

  Single, OR Double or Multiple station (Specify observer's name): Single

                         +----------------------------------+
4 TIMING OF EVENTS:      |                                  |
                         |  OCCULTATION RECORDED: POSITIVE  |
                         |                                  |
                         +----------------------------------+
  Type of event
  Start observation   Interrupt-start   Disappearance   Blink   Flash
  End observation     Jnterrupt-end     Reappearance    Other (specify)

                                            Comments
  Event    Time (UT)    P.E.   Acc.   
  Code    HH MM SS.ss   S.ss   S.ss
  
    S  - 	0114 01s    -      -      :
													PYOTE			AOTA bin4
    D zero 0116 10.0   				estimated        
    D 50%  0116 11.5  +/- 0.1   		estimated				0116  11.73s  1 16 11.56 ± 0.08		
    T Min  0116 14.2   				estimated  at frame 3308
    R 50%  0116 16.7  +/- 0.1     		estimated      			0116  16.85s  1 16 16.86 ± 0.08
    R zero 0116 19.0   				estimated
    
    E  -   0118 01s    -      -      :
  
                          Duration : 5.2 (50%) 9.0 max			5.12s			 5.30
                          Mid-event : 0016 14.2s	


5 TELESCOPE: Type:    135mm F2.8 Telephoto lens    Aperture: 48mm  @  F3.5
             Mount:   Vixen Polarie                Motor drive: Yes
		  FILTER:   Bessel-R (Baader)

6 TIMING & RECORDING:
  Exposure    : 		0.040s
  Signal/noise:			20
  Time source:			GPS++
  Sensor:				QHY174-GPS (5.86x5.86u), Global Shutter
  AOI					900 x 600
  Recording:	    		ADV-12 BIT(1x1bin), SharpCap v4.0.9478, HP i5 SSD W10.
  Time  insertion (specify):	1 PPS (@ start of frame)
  Event insertion (specify):	Tangra analysis

7 OBSERVING CONDITIONS:         	
  Atmospheric transparency: Thin cloud  Wind: 0 Bf      Temperature: +12C
  Star image stability:     Good        Minor planet visible?      : No
           

8 ADDITIONAL COMMENTS: 
  An exciting evening with Betelgeuse behind thin cloud of variable transparency (50-100%)

  I changed the camera settings to compensate for cloud cover. (Gain increased from 100 to 200)
  At T-10min the sky was much clearer but i didnt reduce the gain setting.  The signal is partly saturated.

  Visual observation was made by Anne and myself. She counted down. The mid time seemed to be delayed.
  The impression was a smooth d-r with brightness of Betelgeuse falling to a "red pin-prick" and i estimated 
  a lot fainter then Bellatrix (m 1.6).    - Estimated drop > 2 magnitudes. 
  A wonderfull sight to see and a true once-in-a-life-time event. The fade depth was greater than anticipated.

  Planned reference star images were not obtained because thick cloud returned soon after.
  
 
  Plate scale      9.0 arcsec/pix
  ADV File size	   3.7 GB
  Frame area	   90 x 135 arcmin
  FOCUS            Slight defocus  (12 pix)
  AOI			   900 x 600

  Predicted Time : 12 Dec; 01:16:11 UT   +/- 0 sec
  Combined Mag   : 0.5
  Predicted drop : 13.7
  Max. Duration  : 12 sec
  OW Centre Dist.: 25 km  (North)
  OW Probability : 90%
  Shadow Width   : 142 km
  Alt/Az         : 60° @184°
  Moon Alt       : -     
  Constellation  : Orion

  more CAMERA SETTINGS
  USB Traffic	 = 0 
  Gain		 : 200
  Offset	 	 : 200
  Gamma		 : 1
  CCD Temporature: +23 C

  PyOTE  disk on disk model
  Asteroid diam:  65 km
  Speed        :  11.7 km/sec
  Distance	    :	  1.8 AU
  Wavelength   :  600nm
  Miss distnce :  0
  Baseline ADU : 1,671,800
  Mag drop 6
  Bottom ADU   :     6,655
  Chord estimate:    6 s

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