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On October 06, 2007 the Earthmoon apparently grazed the star SAO 98425. At about 01h04 UTC the Earthmoon grazed and occulted with the dark side of the northpol area the star SAO 98425 in a height of 12 degrees above the east horizon. About 23 seconds later the star was visible again.
This grazing star occultation on the dark side of the moon was captured with my equipment on video with an accuracy of some milliseconds. Evaluation of the video was done later.
Diagram of equipment setup
View to the east from observation place southern from Sparbach
Observation report
Date Observer Position - Sparbach Observer 2007/10/06 48° 44´ 43.7" North (WGS84) Gerhard Dangl Star 15° 13´ 20.8" East (WGS84) 3830, Nonndorf 12 ZC 1370 = SAO 98425 554m (MSL), 599m (WGS84) AUSTRIA
TELESCOPE: Type: Newton Focal length: 1200mm Aperture: 254 mm Magnification: video/primary focus/recorded field 1112" x 830" Mount: Equatorial EQ6 with EQMOD Motor drive: Yes TIMING & RECORDING: Timekeeping: GPS 1PPS Garmin18 LVC + KIWI-OSD Sensor/Camera: WAT-902H2 Ultimate, CCIR, 1/2" Sony CCD-Sensor ICX419ALL Mode of recording: It=20ms (50 Img/s), Video CCIR, AVI, YUY2, Huffyuv, Device of recording: Xpert V-Stream Videograbber USB2.0, Notebook Harddisk Time insertion: KIWI-OSD OBSERVING CONDITIONS: Atmospheric transparency: good Wind: 0 - 0.5m/s Star image stability: good Temperature: 278 Kelvin (+05 deg Celsius) ADDITIONAL COMMENTS: Predictions with Occult3.6 Video evaluation accomblished with VirtualDub1.6.16 and Limovie 0.9.27 Only clear glass filter (Astronomik) for CCD protection was used 3-D position and timing with Garmin GPS18 LVC receiving 10 satellites Horizontal dilution of precision 0.8, geoidal separation 44.4m
Occultation Predictions for Nonndorf_10Zoll in Oktober 2007 E.Long. 15 14 8.2 Lat. 48 47 13.5 Alt. 600m. T.dia 254mm. dMag 0.0 day Time P Star Sp Mag % Elon Sun Moon CA PA VA WA Libration A B RV Cct R.A. (J2000) Dec y m d h m s No D V ill Alt Alt Az o o o o L B m/o m/o "/sec o h m s o m s Graze of 1370WA0 nearby at Lat = +48.75 +0.25(E.Long -15.24), CA = 1.5N 06 1 4 2 Gr 1370WA0 6.9 23- 57 12 76 Closest distance to graze path is 3km at azimuth 159 07 10 06 1 4 4 g 1370WA0 6.9 23- 57 12 76 2N 17 59 1 +7.7 -2.0 +1.0-2.7 .202 +113 9 11 56.9 18 2 39 1370 is double : 6.8 9.5 130" 253.0
Table with results of video measurement Disappearance start 01:04:13.902 (+/-10ms) UTC Disappearance 50% 01:04:13.922 (+/-10ms) UTC Disappearance full 01:04:13.942 (+/-10ms) UTC Reappearance start 01:04:36.942 (+/-10ms) UTC Reappearance 50% 01:04:37.082 (+/-10ms) UTC Reappearance full 01:04:37.122 (+/-10ms) UTC Occultation duration 23.160 (+/-20ms) |
Diagramm - overview![]() |
Diagramm - disappearance![]() |
Diagram - reappearance![]() |
Video of disappearance![]() MPEG4 1MB |
Video of reappearance![]() MPEG4 1MB |
Diagram data created with Software Limovie 0.9.27 from Kazuhisa Miyashita.
November 19, 2007 |
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