Den ljusa stjärnan lyste stickigt orange med en svagare blvit stjärna intill,
tjusigt!
Asteroidockultationer brukar ha en förmåga att mulna bort. Den här gången blev
det tvärtom. En timme före observationstidens början drog varmfrontsmoln upp
från väster och snart syntes bara de allra ljusaste stjärnorna. Efter en
halvtimme löstes de upp och kvar blev bara en molnskärm strax nedanför stjärnan
som skulle ockulteras. En halvtimme efter obstidens slut var himlen helmulen.
Snacka om tur med vädret!
Men det blev förstås ingen ockultation.
Margareta Westlund
ASTEROIDOCKULTATION!
20:e gången gillt, Ate skötte sig! Sedan min premiär för observationer av asteroidockultationer på nyrsaftonen 1990 - den gången var det 205 Martha som ockulterade en stjärna av 6:e magnituden - så har det bara blivit negativa observationer. Hur många som mulnat bort under eller strax före observationstiden har jag ingen koll på.
Det lyckades alltså till slut att hamna inom den smala ockultationszonen,
och allting stämde: Himlen var så gott som helklar, stjärnan var ljus och
lätthittad, månen hann lagom gå ner, septembernatten var mild och behaglig,
och det var t.o.m. natt mellan lördag och söndag! Otroligt nog gick zonen
dessutom över en av mina och K G Anderssons vanliga observationsplatser.
Vi behövde inte ens åka till något nytt och obekant ställe. Det trodde jag
aldrig skulle inträffa!
Margareta Westlund
POSITIV
Instrument: 6 tums newton Förstoring: 30 X Obsplats : Riala, Roslagen Obstid : 00:35.00 till 00:50.00 UT Observatör: Karl-Gustav Andersson Ockultationen pågick mellan 00:38.58,18 till 00:39.07,19 UT. Datum: 10-09-2000 (111) Ate kunde ses visuellt till ca kl: 23:00 UT. Tidtagningssätt, fröken ur + tidtagarur.
POSITIV
ASTEROIDAL OCCULTATION - REPORT FORM +------------------------------+ +-----------------------------+ | EAON | | IOTA/ES | | | | INTERNATIONAL OCCULTATION | | EUROPEAN ASTEROIDAL | | TIMING ASSOCIATION | | OCCULTATION NETWORK | | EUROPEAN SECTION | +------------------------------+ +-----------------------------+ 1 DATE: 10/Sep/2000 STAR: HIP 2559 ASTEROID: Ate Nr.: 111 2 OBSERVER: Name: Johan Warell Abbr: Phone: +46 18 471 5970 +46 18 24 13 42 E-mail: johan.warell[at]astro.uu.se Adress: Wennerbergsg. 11, SE-754 21 Uppsala, Sweden 3. OBSERVING STATION Nearest city: Bro Station: Kvistaberg Observatory Latitude: 59d30'14''+-3'' Longitude: 17d36'30''+-5'' Altitude: 20 m Single, OR Double or Multiple station (Specify observer's name): MULTIPLE STATION (Johan Warell [CCD] and Mauritz Andersson [visual]) +----------------------------------------------+ 4. TIMING OF EVENTS | OCCULTATION RECORDED : POSITIVE | Type of event +----------------------------------------------+ Start observation Interrupt-start Disappearance Blink Flash End observation Jnterrupt-end Reappearance Other (specify) (Personal Equation NOT Subtracted) Event Time(T.U.) P. E. Acc. code HHMMSS.ss S.ss SS.ss S - 003330 - : I - 003415 - : J - 003423 - : I - 003500 - : J - 003502 - : I - 003644 - : J - 003709 - : I - 003748 - : J - 003816 - : D - 003900.42 - 1.11 Absolute 1sig timing error stated R - 003911.12 - 1.16 E - 005300 - : 5 TELESCOPE Type: Schmidt-Cassegrain Aperture: 28 cm F 280 cm Magnification: 93 x Mount: Azimuthal Motor drive: Yes 6 TIMING & RECORDING Timekeeping: Time-signal Station: or Other: Mode of recording: Device of recording: O Stopwatch X Visual X Tape O Television O Eye-ear-method O Photometer O T-Recorder (Chart) O Other (specify) O Other (specify) 7 OBSERVING CONDITIONS Atmospheric transparency: Good Wind: Slightly windy Star image stability : Fair Temperature: +10 oC 8 ADDITIONAL COMMENTS P.E. not included in above timings (not known). Duration of occultation is 10.70+-0.06 sec. Errors are all 1sigma std dev, obtained from four measurements with stopwatch from tape. Mean error of unknown P.E. not included.
POSITIV
ASTEROIDAL OCCULTATION - REPORT FORM +------------------------------+ +-----------------------------+ | EAON | | IOTA/ES | | | | INTERNATIONAL OCCULTATION | | EUROPEAN ASTEROIDAL | | TIMING ASSOCIATION | | OCCULTATION NETWORK | | EUROPEAN SECTION | +------------------------------+ +-----------------------------+ 1 DATE: 10/Sep/2000 STAR: HIP 2559 ASTEROID: Ate Nr.: 111 2 OBSERVER: Name: Johan Warell Abbr: Phone: +46 18 471 5970 +46 18 24 13 42 E-mail: johan.warell[at]astro.uu.se Adress: Wennerbergsg. 11, SE-754 21 Uppsala, Sweden 3. OBSERVING STATION Nearest city: Bro Station: Kvistaberg Observatory Latitude: 59d30'14''+-3'' Longitude: 17d36'30''+-5'' Altitude: 20 m Single, OR Double or Multiple station (Specify observer's name): MULTIPLE STATION (Johan Warell [visual] and Mauritz Andersson [visual]) +----------------------------------------------+ 4. TIMING OF EVENTS | OCCULTATION RECORDED : POSITIVE | Type of event +----------------------------------------------+ Start observation Interrupt-start Disappearance Blink Flash End observation Jnterrupt-end Reappearance Other (specify) Event Time(T.U.) P. E. Acc. code HHMMSS.ss S.ss SS.ss S - 003800 - 0.5 D - 003900.03 - 0.5 R - 003910.86 - 0.5 E - 004000 - 0.5 5 TELESCOPE Type: Schmidt camera Aperture: 100 cm F 300 cm Magnification: --- x Mount: Equatorial Motor drive: Yes 6 TIMING & RECORDING Timekeeping: Time-signal Station: Braunschweig, Germany or Other: Mode of recording: Device of recording: O Stopwatch O Visual O Tape O Television O Eye-ear-method O Photometer O T-Recorder (Chart) X Other (specify): CCD camera (2kx2k, 15 micron pix, 15-bit) X Other (specify): CCD drift scan observation 7 OBSERVING CONDITIONS Atmospheric transparency: Good Wind: Slightly windy Star image stability : Fair Temperature: +10 oC 8 ADDITIONAL COMMENTS Accuracy of timings above due to manual start of exposure and single-second precision of exposure mid-point UT information in FITS image header. Duration of occultation is 10.83+-0.10 sec based on measurement of CCD trail. In this error scintillation and seeing disk is included. CCD drift scan image, center CCD drift scan image, detail
POSITIV
ASTEROIDAL OCCULTATION - REPORT FORM +------------------------------+ +-----------------------------+ | EAON | | IOTA/ES | | | | INTERNATIONAL OCCULTATION | | EUROPEAN ASTEROIDAL | | TIMING ASSOCIATION | | OCCULTATION NETWORK | | EUROPEAN SECTION | +------------------------------+ +-----------------------------+ 1 DATE: 10/Sep/2000 STAR: HIP 2559 ASTEROID: Ate Nr.: 111 2 OBSERVER: Name: Mauritz Andersson Abbr: Phone: +46 18 471 32 67 +46 18 50 73 10 E-mail: mauritz.andersson[at]kvac.uu.se Adress: Granitv. 4B, SE-753 42 Uppsala, Sweden 3. OBSERVING STATION Nearest city: Bro Station: Kvistaberg Observatory Latitude: 59d30'14''+-3'' Longitude: 17d36'30''+-5'' Altitude: 20 m Single, OR Double or Multiple station (Specify observer's name): MULTIPLE STATION (Johan Warell [CCD] and Johan Warell [visual]) +----------------------------------------------+ 4. TIMING OF EVENTS | OCCULTATION RECORDED : POSITIVE | Type of event +----------------------------------------------+ Start observation Interrupt-start Disappearance Blink Flash End observation Jnterrupt-end Reappearance Other (specify) (Personal Equation Subtracted) Event Time(T.U.) P. E. Acc. code HHMMSS.ss S.ss SS.ss S - 003337 - - D - 003900.65 0.34 0.6 R - 003911.35 0.34 0.6 E - 004000 - - 5 TELESCOPE Type: Newton Aperture: 38 cm F 164 cm Magnification: 74 x Mount: Azimuthal Motor drive: No 6 TIMING & RECORDING Timekeeping: Time-signal Station: Braunschweig, Germany or Other: Mode of recording: Device of recording: O Stopwatch X Visual X Tape O Television O Eye-ear-method O Photometer O T-Recorder (Chart) O Other (specify) O Other (specify) 7 OBSERVING CONDITIONS Atmospheric transparency: Good Wind: Slightly windy Star image stability : Good Temperature: +10 oC 8 ADDITIONAL COMMENTS P.E. of 0.34+-0.12 subtracted from the above timings. P.E. was estimated from a computer simulation of reaction time. Accuracy of +-0.6 is estimated incluing time sync error +-0.3s, P.E. variation and tape timing error +-0.1s (estimate from four timings). Duration of occultation is 10.70+-0.3 sec. Errors are all 1sigma std dev.
POSITIV
ASTEROIDAL OCCULTATION - REPORT FORM +------------------------------+ +-----------------------------+ | EAON | | IOTA/ES | | | | INTERNATIONAL OCCULTATION | | EUROPEAN ASTEROIDAL | | TIMING ASSOCIATION | | OCCULTATION NETWORK | | EUROPEAN SECTION | +------------------------------+ +-----------------------------+ 1 DATE: 10/Sep/2000 STAR: HIP 2559 ASTEROID: Ate Nr.: 111 2 OBSERVER: Name: Lars Hermansson Abbr: Phone: +46 18 471 31 78 +46 18 12 63 16 E-mail: lars.hermansson[at]tsl.uu.se Adress: Linnégatan 5A, S-753 32 Uppsala, Sweden 3. OBSERVING STATION Nearest city: Åkersberga Station: Mjölkö Latitude: 59d27'44''+-3'' Longitude: 18d25'42''+-5'' Altitude: 8 m Single, OR Double or Multiple station (Specify observer's name): Single station +----------------------------------------------+ 4. TIMING OF EVENTS | OCCULTATION RECORDED : POSITIVE | Type of event +----------------------------------------------+ Start observation Interrupt-start Disappearance Blink Flash End observation Jnterrupt-end Reappearance Other (specify) (Personal Equation Subtracted) Event Time(T.U.) P. E. Acc. code HHMMSS.ss S.ss SS.ss S - 003500.00 - 0.4 D - 003855.76 0.39 0.4 R - 003907.46 0.39 0.4 E - 004000.00 - 0.4 5 TELESCOPE Type: Newton Reflector Aperture: 11 cm F 90 cm Magnification: 90 x Mount: Equatorial Motor drive: Yes 6 TIMING & RECORDING Timekeeping: Time-signal Station: Braunschweig, Germany (through Radio Controlled Watch) or Other: Mode of recording: Device of recording: O Stopwatch X Visual X Tape O Television O Eye-ear-method O Photometer O T-Recorder (Chart) O Other (specify) O Other (specify) 7 OBSERVING CONDITIONS Atmospheric transparency: Good Wind: Very little Star image stability : Good Temperature: 8 ADDITIONAL COMMENTS P.E. subtracted two times from the tape readout times (observation delay and tape readout delay) P.E. of 0.39+-0.06 was estimated from a computer simulation of reaction time. Accuracy of +-0.4 is estimated including: radio watch inaccuracy +-0.1s,time sync error +-0.1s, tape speed variation +-0.1s and P.E. variation +-0.1s Duration of occultation was 11.70+-0.08 sec.
