IOTA/IOTA-ES occultation update for (536) Merapi / TYC 54-01067-1 event on 2024 Oct 17, 09:21 UT Visible from Summary ------- On 2024 Oct 17 UT, the 149.255 km diameter asteroid (536) Merapi will occult a 11.1 mag star in the constellation Cetus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.13 mag to 13.03 mag (the magnitude of the asteroid) for at most 11.390 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: 99 * date and approx. time of event: 2024 Oct 17, 09:13 - 2024 Oct 17, 09:28 * geocentric midpoint of event [JD]: 2460600.88963900 * magnitude of target star: 11.06 * magnitude drop [mag]: 2.13 * estimated maximum duration [s]: 11.390 * Moon: 100 % sunlit, 24° distance * Sun: 159° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 162 * 1 sigma uncertainty interval [path widths]: +/- 0.20 * 1 sigma uncertainty interval [seconds]: +/- 3.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.024, +/- 0.018) * 1 sigma uncertainty ellipse (major, minor, PA): (0.030", 0.004", 54°) * approx speed of asteroid's shadow [km/s]: 13.0993 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 54-01067-1 by 536 Merapi on 2024 Oct 17 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 148 0 0 -22 11 9 9 28 33.9 1 84 -18 -21 27 8 -22 55 24 -21 9 44 -23 13 1 .... 149 0 0 -22 5 28 9 28 33.8 2 84 -19 -21 21 27 -22 49 42 -21 4 3 -23 7 20 0.26 150 0 0 -21 59 47 9 28 33.5 2 83 -20 -21 15 47 -22 44 2 -20 58 22 -23 1 39 0.32 151 0 0 -21 54 7 9 28 33.0 3 83 -21 -21 10 7 -22 38 22 -20 52 43 -22 55 59 0.35 152 0 0 -21 48 29 9 28 32.5 4 82 -22 -21 4 28 -22 32 43 -20 47 4 -22 50 21 0.36 153 0 0 -21 42 51 9 28 31.7 5 82 -22 -20 58 51 -22 27 6 -20 41 27 -22 44 43 0.37 154 0 0 -21 37 15 9 28 30.9 6 82 -23 -20 53 15 -22 21 29 -20 35 51 -22 39 7 0.38 155 0 0 -21 31 40 9 28 29.9 7 81 -24 -20 47 40 -22 15 54 -20 30 16 -22 33 31 0.39 156 0 0 -21 26 6 9 28 28.8 8 81 -25 -20 42 6 -22 10 20 -20 24 43 -22 27 58 0.39 157 0 0 -21 20 34 9 28 27.5 9 81 -26 -20 36 35 -22 4 48 -20 19 11 -22 22 25 0.39 158 0 0 -21 15 4 9 28 26.1 10 80 -27 -20 31 4 -21 59 18 -20 13 41 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-22 44 41 -20 59 2 -23 2 18 0.44 - 43 0 0 -22 6 5 9 13 41.7 9 280 12 -21 22 5 -22 50 20 -21 4 41 -23 7 57 0.44 - 42 0 0 -22 11 45 9 13 40.5 8 279 13 -21 27 45 -22 56 0 -21 10 21 -23 13 37 0.44 - 41 0 0 -22 17 26 9 13 39.3 7 279 14 -21 33 25 -23 1 40 -21 16 1 -23 19 18 0.44 - 40 0 0 -22 23 7 9 13 38.4 6 278 15 -21 39 6 -23 7 22 -21 21 42 -23 24 59 0.44 - 39 0 0 -22 28 48 9 13 37.5 5 278 16 -21 44 48 -23 13 3 -21 27 24 -23 30 41 0.45 - 38 0 0 -22 34 30 9 13 36.8 4 278 17 -21 50 30 -23 18 45 -21 33 6 -23 36 23 0.46 - 37 0 0 -22 40 13 9 13 36.3 3 277 17 -21 56 12 -23 24 27 -21 38 48 -23 42 5 0.47 - 36 0 0 -22 45 55 9 13 35.8 2 277 18 -22 1 54 -23 30 10 -21 44 30 -23 47 48 0.48 - 35 0 0 -22 51 37 9 13 35.5 2 276 19 -22 7 37 -23 35 52 -21 50 13 -23 53 30 0.52 - 34 0 0 -22 57 20 9 13 35.4 1 276 20 -22 13 19 -23 41 35 -21 55 55 -23 59 12 0.69 Uncertainty in time = +/- 4 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: TYC 54-01067-1 * constellation : Cetus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 02 53 21.6577 DE: +05 17 27.609 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 02 53 21.6577 DE: +05 17 27.608 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.1 * B mag [mag]: 11.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (536) Merapi asteroid class: approx. diameter [km]: 149 approx. diameter ["]: 0.089 distance from Earth [AU]: 2.30120 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#122 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): 0.030", 0.004", 54.231° remarks: * orbital elements for (536)Merapi : Mean anomaly = 33.8672496346 deg Arg. of pericenter = 296.4581590337 deg Long. of node = 59.1973698469 deg Inclination = 19.4324477278 deg Eccentricity = 0.0882989099 Semimajor axis = 3.4972935758 AU Perihelion dist = 3.1884863654 AU Mag: H = 8.18, G = 0.15 Epoch of elements : MJD 60600.38963667 TDT (2024 Oct 17.3896) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1222023Apr24,11.39,2024,10,17,9.351336,-0.002860,-0.384109,-7.393446,0.049446,-0.002066,0.000454,0.000001,0.000000 -122.9727,5.3946,36.05,-9.50,False TYC 54-01067-1,2.88934934,5.2910024,11.39,11.06,10.88,0.0,0,,2.91139837,5.3946076,2.13,1.90,0,0,0 536,Merapi,13.03,149.255,2.3012,0,0,-1.892,0.19,,8.2,0 0,33.8085,2024,10,17,296.4582,59.1974,19.4324,0.08830,3.49729,3.18849,8.17,5.0,0.15 1.198,0.0297,0.0037,54,0.0178,Known errors,0.91,0,-1,-1 20241017_1067-1,60140.64 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:22 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org