IOTA/IOTA-ES occultation update for (2308) Schilt / TYC 7455-01150-1 event on 2024 Dec 04, 08:47 UT Visible from Summary ------- On 2024 Dec 04 UT, the 17.5033918047492 km diameter asteroid (2308) Schilt will occult a 9.6 mag star in the constellation Microscopium for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 7.35 mag to 16.97 mag (the magnitude of the asteroid) for at most 0.440 seconds. This update is based on, astrometry for the asteroid kindly provided by the IAU Minor Planet Center. This work has made use of data from the European Space Agency (ESA) mission Gaia (http://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, http://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. The event at a glimpse ---------------------- * Rank: 98 * date and approx. time of event: 2024 Dec 04, 08:45 - 2024 Dec 04, 08:49 * geocentric midpoint of event [JD]: 2460648.86618016 * magnitude of target star: 9.62 * magnitude drop [mag]: 7.35 * estimated maximum duration [s]: 0.440 * Moon: 10 % sunlit, 14° distance * Sun: 51° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 21 * 1 sigma uncertainty interval [path widths]: +/- 0.36 * 1 sigma uncertainty interval [seconds]: +/- 0.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.015", 0.003", 77°) * approx speed of asteroid's shadow [km/s]: 40.4334 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7455-01150-1 by 2308 Schilt on 2024 Dec 4 Centre Star Star Sun Path Limits Error Limits Alt E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 Crn o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude - 21 0 0 -44 51 36 8 45 6.0 1 134 31 -44 59 40 -44 43 32 -45 5 36 -44 37 39 .... - 20 0 0 -45 33 37 8 45 6.1 2 133 32 -45 41 41 -45 25 34 -45 47 35 -45 19 41 0.60 - 19 0 0 -46 15 1 8 45 6.3 3 133 33 -46 23 4 -46 6 59 -46 28 58 -46 1 6 0.63 - 18 0 0 -46 55 47 8 45 6.4 4 132 33 -47 3 50 -46 47 46 -47 9 43 -46 41 54 0.63 - 17 0 0 -47 35 55 8 45 6.7 5 131 34 -47 43 56 -47 27 54 -47 49 49 -47 22 3 0.64 - 16 0 0 -48 15 22 8 45 7.0 6 130 35 -48 23 23 -48 7 23 -48 29 15 -48 1 32 0.64 - 15 0 0 -48 54 9 8 45 7.3 7 130 35 -49 2 8 -48 46 10 -49 7 59 -48 40 21 0.65 - 14 0 0 -49 32 14 8 45 7.7 7 129 36 -49 40 12 -49 24 17 -49 46 2 -49 18 28 0.65 - 13 0 0 -50 9 36 8 45 8.1 8 128 36 -50 17 33 -50 1 41 -50 23 22 -49 55 53 0.65 - 12 0 0 -50 46 16 8 45 8.5 9 127 37 -50 54 11 -50 38 22 -50 59 59 -50 32 36 0.65 - 11 0 0 -51 22 12 8 45 9.0 10 127 37 -51 30 5 -51 14 20 -51 35 52 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Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: TYC 7455-01150-1 * constellation : Microscopium * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 29 29.9214 DE: -30 23 44.060 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 29 29.9213 DE: -30 23 44.061 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 9.6 * B mag [mag]: 9.8 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2308) Schilt asteroid class: approx. diameter [km]: 18 approx. diameter ["]: 0.009 distance from Earth [AU]: 2.73840 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#52 date of fit: 2023 Apr 24 source of used astrometry: MPC, JPL number of used observations: 0 number of rejected observations: 0 time covered by the observations: 1800 Jan 01 - 1800 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.015", 0.003", 76.619° remarks: * orbital elements for (2308)Schilt : Mean anomaly = 39.5822808960 deg Arg. of pericenter = 233.2669489292 deg Long. of node = 34.2005575387 deg Inclination = 14.1742918688 deg Eccentricity = 0.1718235295 Semimajor axis = 2.5487950401 AU Perihelion dist = 2.1108520802 AU Mag: H = 12.03, G = 0.15 Epoch of elements : MJD 60648.36617987 TDT (2024 Dec 04.3662) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#522023Apr24,0.44,2024,12,4,8.788324,0.192386,-0.509490,21.346274,8.072706,0.004390,0.000397,-0.000001,-0.000001 102.2680,-30.3147,45.76,-22.32,False TYC 7455-01150-1,20.49164490,-30.3955722,9.82,9.62,9.51,0.1,0,,20.51698783,-30.3147029,7.35,7.01,0,0,0 2308,Schilt,16.97,17.702,2.7384,0,0,5.294,25.93,,1.2,0 0,39.4936,2024,12,4,233.2669,34.2006,14.1743,0.17182,2.54880,2.11085,12.03,5.0,0.15 1.366,0.0147,0.0027,77,0.0032,Known errors,0.96,0,-1,-1 20241204_1150-1,60140.73 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 17:25 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org