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OCCULTATION OF UCAC4 289-110099 BY 303 Josephina
2014 July 05


Five clearly observed misses were recorded for this event.

View the updated prediction.

Observers:
  1(M) W Hanna,Alice Springs, Australia     
  2(M) D Gault,Kuriwa Observatory, NSW, AU  
  3(M) J Newman,Flynn, ACT, AU              
  4(M) B Loader,Darfield,NZ                 
  5(M) A Pennell,Dunedin NZ                 
  6(P) Prediction, TT14 28 June             

        

Josephina occultation__ 2014 July 05

Discussion:

The circle above is plotted at the expected 105 km diameter of Josephina. With no positive chords we cannot say where the actual path was, so the circle has been plotted on the predicted path.

Some observers had trouble identifying the star as it was expected to be about Mag 14.
However it was in fact much dimmer when using WATEC 120N+ cameras and may have looked more like Mag 16.3. The details can be found on OW Event Details ... Magnitudes Tab shown in the image below.

Josephina occultation__ 2014 July 05

The partial OW screen image below shows the Star Mag and MP Mag columns and the Camera specific mag beneath.

Josephina occultation__ 2014 July 05

This effect of (presumably very blue stars) may have been the cause of other Missing Star notes in the past.

Observational Data:


Observation details for MP ( 303 ) Josephina
By Star              UCAC4 289-110099
On 2014-07-05  at 10:36:10.0

_______________________________

Observer   William Hanna
Location   Alice Springs, Australia
Longitude  +133:53
Latitude   -23:42
Altitude   584 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   20 cm
Seeing     Steady Clear
Camera Type  Grasshopper Express with ADVS              ADVS
Camera Delay 0
Timing     GPS - time inserted Video with frame analysis

Missed

Comments: Gamma 1.0, gain 29dB Light breeze, 15C 
The target star was considerably dimmer than expected per the catalogue.

_______________________________

Observer   Dave Gault
Location   Kuriwa Observatory, NSW, AU
Longitude  +150:38
Latitude   -33:39
Altitude   286 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   30 cm
Seeing     Steady Clear
Camera Type  Grasshopper Express with ADVS              ADVS
Camera Delay 0
Timing     GPS - time inserted Video with frame analysis

Missed

Comments: Maybe star fainter than 13.9 - see attached GoogleSky image

Josephina occultation__ 2014 July 05


 I say maybe because the Google-Sky image shows the target star much-much fainter
 than mag. 13.9, which is the approx. magnitude of the 3 stars in the triangle 
below the stick-pin.  
I could detect the asteroid, and intended to grab an image of the pair well 
separated but hit a technical issue.

_______________________________

Observer   B. Loader
Location   Darfield,NZ
Longitude  +172:06
Latitude   -43:28
Altitude   210 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   25 cm
Seeing     Slight flickering Clear
Camera Type  WAT120N+       AAV-PAL
Camera Delay -0.35
Timing     GPS - time inserted Video with frame analysis

Missed

Comments: First 3 minutes of intended observing run lost in cloud.  
The magnitude of the target image clearly matched a 13.86 star close by and
 was not 13.1. The target star was not visible.  
Occult  comparison with other catalogs shows no UCAC4 magnitude, others were
at about 17.8, so not visible. 
Report prepopulated by IOTA Reporting Add-in for OW ver.1.8

_______________________________

Observer   John Newman
Location   Flynn, ACT, AU
Longitude  +149:02
Latitude   -35:11
Altitude   657 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   36 cm
Seeing     Slight flickering Thin cloud < 2
Camera Type  WAT120N+       NTSC/EIA
Camera Delay -0.559
Timing     GPS - time inserted Video with frame analysis

Missed

Comments:   Report prepopulated by IOTA Reporting Add-in for OW ver.1.8

_______________________________

Observer   Ash Pennell 
Location   Dunedin NZ
Longitude  +170:29
Latitude   -45:52
Altitude   136 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   35 cm
Seeing     Slight flickering Broken cloud
Camera Type  WAT120N        PAL/CCIR
Camera Delay -0.19
Timing     GPS - time inserted Video with frame analysis

Missed

Comments:   

        

Return to 2014 occultation results



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