IOTA/IOTA-ES occultation update for (2308) Schilt / HIP 101977 event on 2012 Aug 19, 16:43 UT Visible from Australia, Africa Summary ------- On 2012 Aug 19 UT, the 18 km diameter asteroid (2308) Schilt will occult a 10.1 mag star in the constellation Microscopium for observers along a path across Australia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.8 mag to 14.9 mag (the magnitude of the asteroid) for at most 2.5 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Hugh Harris, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 18 * date and approx. time of event: 2012 Aug 19, 16:28 - 2012 Aug 19, 16:58 UT * geocentric midpoint of event [JD]: 2456159.1967 * magnitude of target star: 10.1 * magnitude drop [mag]: 4.8 * estimated maximum duration [s]: 2.5 * Moon: 5 % sunlit, 121° distance * Sun: 145° distance * rough path description: Australia, Africa The occultation path -------------------- * approximate projected width [km]: 18 * 1 sigma uncertainty interval [path widths]: +/- 3.81 * 1 sigma uncertainty interval [seconds]: +/- 9.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .100 +/- .056) * 1 sigma uncertainty ellipse (major, minor, PA): ( .102", .052", 76° ) * approx speed of asteroid's shadow [km/s]: 6.9039 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 101977 by 2308 Schilt on 2012 Aug 19 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 ' " Longitude Longitude Longitude Longitude 25 29 18 25 0 0 16 58 26 1 140 -3 25 36 26 25 22 10 26 30 41 ... .. .. 26 24 1 24 0 0 16 58 25 3 141 -4 26 31 4 26 16 57 27 24 50 25 23 6 27 18 7 23 0 0 16 58 24 4 141 -5 27 25 7 27 11 7 28 18 25 26 17 44 28 11 41 22 0 0 16 58 22 5 141 -6 28 18 38 28 4 44 29 11 31 27 11 48 29 4 46 21 0 0 16 58 20 6 142 -7 29 11 40 28 57 53 30 4 10 28 5 20 29 57 26 20 0 0 16 58 18 8 142 -8 30 4 16 29 50 35 30 56 25 28 58 24 30 49 43 19 0 0 16 58 15 9 142 -9 30 56 31 30 42 55 31 48 21 29 51 4 31 41 41 18 0 0 16 58 11 10 143 -10 31 48 27 31 34 55 32 39 59 30 43 23 32 33 23 17 0 0 16 58 7 12 143 -11 32 40 6 32 26 39 33 31 24 31 35 23 33 24 51 16 0 0 16 58 3 13 143 -12 33 31 33 33 18 9 34 22 36 32 27 8 34 16 9 15 0 0 16 57 58 14 143 -14 34 22 49 34 9 29 35 13 40 33 18 40 35 7 19 14 0 0 16 57 53 15 144 -15 35 13 57 35 0 40 36 4 38 34 10 2 35 58 23 13 0 0 16 57 47 17 144 -16 36 5 1 35 51 45 36 55 33 35 1 18 36 49 25 12 0 0 16 57 41 18 144 -17 36 56 1 36 42 48 37 46 26 35 52 28 37 40 26 11 0 0 16 57 34 19 144 -18 37 47 2 37 33 50 38 37 21 36 43 37 38 31 29 10 0 0 16 57 27 21 144 -19 38 38 5 38 24 54 39 28 20 37 34 46 39 22 37 9 0 0 16 57 20 22 145 -20 39 29 12 39 16 3 40 19 25 38 25 57 40 13 53 8 0 0 16 57 12 23 145 -21 40 20 27 40 7 18 41 10 39 39 17 14 41 5 17 7 0 0 16 57 3 24 145 -22 41 11 52 40 58 43 42 2 4 40 8 39 41 56 54 6 0 0 16 56 54 26 145 -23 42 3 29 41 50 19 42 53 43 41 0 14 42 48 44 5 0 0 16 56 45 27 145 -24 42 55 20 42 42 9 43 45 38 41 52 2 43 40 52 4 0 0 16 56 35 28 145 -25 43 47 28 43 34 16 44 37 51 42 44 4 44 33 19 3 0 0 16 56 25 30 145 -26 44 39 56 44 26 42 45 30 26 43 36 24 45 26 7 2 0 0 16 56 14 31 145 -27 45 32 45 45 19 30 46 23 24 44 29 4 46 19 20 1 0 0 16 56 3 32 146 -28 46 26 0 46 12 41 47 16 48 45 22 7 47 13 0 0 0 0 16 55 52 33 146 -30 47 19 41 47 6 20 48 10 41 46 15 35 48 7 10 - 1 0 0 16 55 40 35 146 -31 48 13 53 48 0 28 49 5 6 47 9 30 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Uncertainty in time = +/- 14 secs Prediction of 2012 Apr 8.0 Data for the target star ------------------------ * name: HIP 101977 * constellation : Microscopium * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 39 57.3268 DE: -43 36 23.214 * position source: mpos:UCAC2 pm:UCAC2 plx:HIP2 * standard error: RA,DE ["]: ( .021, .024 ) * V mag [mag]: 10.1 * B mag [mag]: 10.5 * Apparent position with proper motion RA(deg): 310.2137212365 DE(deg): -43.5587073023 * Equation of equinoxes (radians) : 0.000072216583212 * Diameter [mas]: 0 * remarks:hip2 pm issue, UCAC2 looks OK Data for the minor planet ------------------------- * general information: (number) name: (2308) Schilt approx. diameter [km]: 18 approx. diameter ["]: .019 distance from Earth [AU]: 1.29500 * orbital information: orbit source: Preston date of fit: 2012 Apr 08 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 828 number of rejected observations: 22 time covered by the observations: 1934 Mar 07 - 2011 May 07 1 sigma uncertainty ellipse (major, minor, PA): 0.100, 0.046, 75° remarks: * orbital elements for (2308) Schilt : Mean anomaly = 32.25189207 deg Arg. of pericenter = 233.00208515 deg Long. of node = 34.43012383 deg Inclination = 14.18139533 deg Eccentricity = 0.17351416 Semimajor axis = 2.54778825 AU Perihelion dist = 2.10571092 AU Mag: H = 11.81, G = 0.15 Epoch of elements : MJD 56158.69700000 TDT (2012 Aug 19.697) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Aug 19 2308 Schilt 16h 43.2m UT 10.1 20 39 57.327-43 36 23.21HIP 101977 10.5 14.9 18 2.5 1.295 -2.154 12.31 90.7410 -43.610 -69.94 12.48 16.7208 0.07460 0.14229 -3.44992 1.81187 0.00172 0.00256 2000 30.1440962012 811.00000233.002085 34.430124 14.1813950.17351416 2.5477883 2.105710911.8 5.00.15 RATE 2.4235900 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.102 0.052 76 4.81 0.073 0 0-2-4 456025.0020120819_101977 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jun 21, 04:14 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org