IOTA/IOTA-ES occultation update for (1233) Kobresia / TYC 6305-01509-1 event on 2012 Aug 08, 14:05 UT Visible from N Australia Summary ------- On 2012 Aug 08 UT, the 36 km diameter asteroid (1233) Kobresia will occult a 11.7 mag star in the constellation Sagittarius for observers along a path across N Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.2 mag to 14.8 mag (the magnitude of the asteroid) for at most 5.1 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: 56 * date and approx. time of event: 2012 Aug 08, 13:50 - 2012 Aug 08, 14:19 UT * geocentric midpoint of event [JD]: 2456148.087325 * magnitude of target star: 11.7 * magnitude drop [mag]: 3.2 * estimated maximum duration [s]: 5.1 * Moon: 61 % sunlit, 103° distance * Sun: 153° distance * rough path description: N Australia The occultation path -------------------- * approximate projected width [km]: 36 * 1 sigma uncertainty interval [path widths]: +/- 1.13 * 1 sigma uncertainty interval [seconds]: +/- 7.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .056 +/- .037) * 1 sigma uncertainty ellipse (major, minor, PA): ( .057", .036", 84° ) * approx speed of asteroid's shadow [km/s]: 7.1461 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6305-01509-1 by 1233 Kobresia on 2012 Aug 8 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 57 0 0 - 2 27 33 14 19 0 27 112 -1 - 2 17 8 - 2 37 57 - 1 53 36 - 3 1 29 58 0 0 - 2 49 20 14 18 52 28 112 -2 - 2 38 56 - 2 59 44 - 2 15 24 - 3 23 14 59 0 0 - 3 10 58 14 18 44 29 112 -3 - 3 0 34 - 3 21 22 - 2 37 4 - 3 44 51 60 0 0 - 3 32 28 14 18 37 30 112 -4 - 3 22 4 - 3 42 51 - 2 58 35 - 4 6 19 61 0 0 - 3 53 48 14 18 28 31 112 -5 - 3 43 25 - 4 4 11 - 3 19 57 - 4 27 37 62 0 0 - 4 14 59 14 18 20 32 112 -6 - 4 4 36 - 4 25 21 - 3 41 10 - 4 48 46 63 0 0 - 4 35 59 14 18 11 33 112 -7 - 4 25 37 - 4 46 21 - 4 2 12 - 5 9 45 64 0 0 - 4 56 49 14 18 3 34 112 -8 - 4 46 28 - 5 7 10 - 4 23 4 - 5 30 34 65 0 0 - 5 17 29 14 17 54 35 111 -9 - 5 7 8 - 5 27 49 - 4 43 45 - 5 51 11 66 0 0 - 5 37 57 14 17 44 36 111 -10 - 5 27 37 - 5 48 17 - 5 4 15 - 6 11 38 67 0 0 - 5 58 14 14 17 35 37 111 -11 - 5 47 55 - 6 8 33 - 5 24 34 - 6 31 53 68 0 0 - 6 18 19 14 17 25 38 111 -12 - 6 8 0 - 6 28 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25 26 - 3 46 17 - 3 1 52 - 4 9 49 -146 0 0 - 3 13 45 13 50 55 3 250 -29 - 3 3 19 - 3 24 11 - 2 39 44 - 3 47 45 -145 0 0 - 2 51 29 13 50 54 2 250 -28 - 2 41 2 - 3 1 55 - 2 17 26 - 3 25 30 -144 0 0 - 2 29 3 13 50 54 1 249 -27 - 2 18 36 - 2 39 30 - 1 54 58 - 3 3 6 Uncertainty in time = +/- 9 secs Prediction of 2012 Jul 8.0 Data for the target star ------------------------ * name: TYC 6305-01509-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 24 28.9197 DE: -20 34 02.569 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .042, .028 ) * V mag [mag]: 11.7 * B mag [mag]: 12.1 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1233) Kobresia approx. diameter [km]: 36 approx. diameter ["]: .033 distance from Earth [AU]: 1.48500 * orbital information: orbit source: Preston date of fit: 2012 Jul 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1259 number of rejected observations: 42 time covered by the observations: 1927 Oct 03 - 2012 Jul 02 1 sigma uncertainty ellipse (major, minor, PA): 0.038, 0.023, 76° remarks: * orbital elements for (1233) Kobresia : Mean anomaly = 31.79892539 deg Arg. of pericenter = 333.57118372 deg Long. of node = 291.47067870 deg Inclination = 5.60704771 deg Eccentricity = 0.05679799 Semimajor axis = 2.55513158 AU Perihelion dist = 2.41000524 AU Mag: H = 11.53, G = 0.15 Epoch of elements : MJD 56147.58700000 TDT (2012 Aug 08.587) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Aug 8 1233 Kobresia 14h 5.7m UT 11.7 19 24 28.920-20 34 2.57TYC 6305-01509-1 12.1 14.8 36 5.1 1.485 -1.693 2.07 122.1984 -20.568 -30.04 15.91 14.0958 0.00413 0.04701 -4.01828 0.34988 0.00239 0.00022 2000 29.9680692012 8 1.00000333.571184291.470679 5.6070480.05679799 2.5551316 2.410005211.3 5.00.15 RATE 2.4131490 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.057 0.036 84 2.13 0.038 0 0-3 1 056116.0020120808_1509-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 07, 22:59 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org