IOTA/IOTA-ES occultation update for (963) Iduberga / TYC 0639-00597-1 event on 2012 Oct 23, 19:31 UT Visible from Japan, China, SW Asia, Arabia, Africa Summary ------- On 2012 Oct 23 UT, the 10 km diameter asteroid (963) Iduberga will occult a 9.1 mag star in the constellation Cetus for observers along a path across Japan, China, SW Asia, Arabia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.3 mag to 14.4 mag (the magnitude of the asteroid) for at most 1.3 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 23 * date and approx. time of event: 2012 Oct 23, 19:19 - 2012 Oct 23, 19:43 UT * geocentric midpoint of event [JD]: 2456224.31360833 * magnitude of target star: 9.1 * magnitude drop [mag]: 5.3 * estimated maximum duration [s]: 1.3 * Moon: 68 % sunlit, 79° distance * Sun: 169° distance * rough path description: Japan, China, SW Asia, Arabia, Africa The occultation path -------------------- * approximate projected width [km]: 11 * 1 sigma uncertainty interval [path widths]: +/- 2.99 * 1 sigma uncertainty interval [seconds]: +/- 5.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .061 +/- .042) * 1 sigma uncertainty ellipse (major, minor, PA): ( .064", .036", 67° ) * approx speed of asteroid's shadow [km/s]: 7.7847 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0639-00597-1 by 963 Iduberga on 2012 Oct 23 Centre Star Star Sun Path Limits Error Limits E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude - 22 0 0 24 21 10 19 43 58 0 82 -12 24 24 11 24 18 9 24 42 13 .. .. .. - 21 0 0 24 29 18 19 43 58 1 82 -13 24 32 18 24 26 17 24 50 21 .. .. .. - 20 0 0 24 37 25 19 43 58 2 83 -14 24 40 26 24 34 25 24 58 29 .. .. .. - 19 0 0 24 45 33 19 43 57 3 83 -15 24 48 34 24 42 32 25 6 36 24 24 33 - 18 0 0 24 53 40 19 43 56 4 83 -16 24 56 41 24 50 39 25 14 43 24 32 41 - 17 0 0 25 1 47 19 43 55 5 84 -17 25 4 47 24 58 46 25 22 50 24 40 47 - 16 0 0 25 9 52 19 43 53 6 84 -17 25 12 53 25 6 52 25 30 55 24 48 53 - 15 0 0 25 17 57 19 43 52 7 85 -18 25 20 58 25 14 57 25 39 0 24 56 58 - 14 0 0 25 26 1 19 43 50 8 85 -19 25 29 2 25 23 0 25 47 4 25 5 2 - 13 0 0 25 34 4 19 43 48 9 86 -20 25 37 5 25 31 3 25 55 7 25 13 4 - 12 0 0 25 42 5 19 43 46 10 86 -21 25 45 6 25 39 5 26 3 8 25 21 6 - 11 0 0 25 50 5 19 43 43 10 86 -22 25 53 6 25 47 5 26 11 8 25 29 6 - 10 0 0 25 58 4 19 43 40 11 87 -23 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36 54 19 19 24 9 274 -1 26 39 54 26 33 53 26 57 56 26 15 55 162 0 0 26 29 2 19 19 21 8 275 0 26 32 3 26 26 1 26 50 5 26 8 3 Uncertainty in time = +/- 6 secs Prediction of 2012 Sep 27.0 Data for the target star ------------------------ * name: TYC 0639-00597-1 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 02 37 32.3022 DE: +07 36 14.255 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .023 ) * V mag [mag]: 9.1 * B mag [mag]: 9.5 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (963) Iduberga approx. diameter [km]: 10 approx. diameter ["]: .014 distance from Earth [AU]: 0.99300 * orbital information: orbit source: Preston date of fit: 2012 Sep 26 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 902 number of rejected observations: 28 time covered by the observations: 1921 Nov 24 - 2012 Sep 09 1 sigma uncertainty ellipse (major, minor, PA): 0.061, 0.029, 64° remarks: * orbital elements for (963) Iduberga : Mean anomaly = 334.75857686 deg Arg. of pericenter = 5.44019438 deg Long. of node = 62.50620341 deg Inclination = 7.98330787 deg Eccentricity = 0.13773590 Semimajor axis = 2.24775746 AU Perihelion dist = 1.93816055 AU Mag: H = 12.18, G = 0.15 Epoch of elements : MJD 56223.81300000 TDT (2012 Oct 23.813) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 23 963 Iduberga 19h 31.6m UT 9.1 2 37 32.302 7 36 14.26TYC 0639-00597-1 9.5 14.4 10 1.3 0.993 -2.619 -0.35 73.8683 7.605 -116.83 -11.75 19.5266 -0.00408 0.42056 -4.39373 -0.03959 -0.00095 0.00040 2000 333.64339320121020.00000 5.440194 62.506203 7.9833080.13773590 2.2477575 1.938160612.5 5.00.15 RATE 2.9246900 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.064 0.036 67 3.99 0.041 0 0 2-5 056197.0020121023_0597-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Sep 26, 22:40 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org