IOTA/IOTA-ES occultation update for (782) Montefiore / UCAC4 316-227257 event on 2024 Oct 14, 02:58 UT Visible from Summary ------- On 2024 Oct 14 UT, the 13.3276046587887 km diameter asteroid (782) Montefiore will occult a 10.7 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.30 mag to 15.94 mag (the magnitude of the asteroid) for at most 0.670 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 Oct 14, 02:54 - 2024 Oct 14, 03:02 * geocentric midpoint of event [JD]: 2460597.62397784 * magnitude of target star: 10.65 * magnitude drop [mag]: 5.30 * estimated maximum duration [s]: 0.670 * Moon: 83 % sunlit, 46° distance * Sun: 86° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 17 * 1 sigma uncertainty interval [path widths]: +/- 0.35 * 1 sigma uncertainty interval [seconds]: +/- 0.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.011, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.011", 0.003", 86°) * approx speed of asteroid's shadow [km/s]: 20.2049 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 316-227257 by 782 Montefiore on 2024 Oct 14 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 110 0 0 -38 44 40 2 54 12.1 1 124 53 -38 50 10 -38 39 9 -38 54 1 -38 35 19 .... 111 0 0 -39 17 35 2 54 12.3 2 124 53 -39 23 6 -39 12 5 -39 26 57 -39 8 15 0.63 112 0 0 -39 50 18 2 54 12.5 3 123 53 -39 55 49 -39 44 47 -39 59 40 -39 40 57 0.66 113 0 0 -40 22 46 2 54 12.9 4 123 53 -40 28 17 -40 17 16 -40 32 8 -40 13 26 0.67 114 0 0 -40 55 0 2 54 13.3 4 122 53 -41 0 31 -40 49 29 -41 4 22 -40 45 40 0.68 115 0 0 -41 26 58 2 54 13.9 5 121 53 -41 32 29 -41 21 27 -41 36 19 -41 17 37 0.68 116 0 0 -41 58 38 2 54 14.5 6 121 53 -42 4 9 -41 53 8 -42 8 0 -41 49 18 0.68 117 0 0 -42 30 2 2 54 15.2 7 120 53 -42 35 32 -42 24 31 -42 39 23 -42 20 42 0.69 118 0 0 -43 1 6 2 54 16.1 8 119 53 -43 6 36 -42 55 36 -43 10 27 -42 51 47 0.69 119 0 0 -43 31 51 2 54 17.0 9 119 53 -43 37 21 -43 26 21 -43 41 11 -43 22 32 0.69 120 0 0 -44 2 16 2 54 17.9 10 118 53 -44 7 46 -43 56 47 -44 11 36 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14 44 3 2 32.2 18 249 -49 -32 20 11 -32 9 18 -32 23 59 -32 5 30 0.73 - 54 0 0 -31 40 12 3 2 34.3 17 249 -50 -31 45 38 -31 34 46 -31 49 26 -31 30 59 0.73 - 53 0 0 -31 5 41 3 2 36.3 16 248 -51 -31 11 7 -31 0 16 -31 14 54 -30 56 30 0.74 - 52 0 0 -30 31 15 3 2 38.2 15 248 -51 -30 36 40 -30 25 50 -30 40 26 -30 22 5 0.74 - 51 0 0 -29 56 53 3 2 39.9 14 247 -52 -30 2 18 -29 51 30 -30 6 4 -29 47 45 0.74 - 50 0 0 -29 22 38 3 2 41.6 13 246 -52 -29 28 1 -29 17 15 -29 31 47 -29 13 31 0.74 - 49 0 0 -28 48 30 3 2 43.1 12 246 -53 -28 53 53 -28 43 8 -28 57 38 -28 39 24 0.75 - 48 0 0 -28 14 31 3 2 44.6 11 245 -54 -28 19 53 -28 9 10 -28 23 37 -28 5 27 0.75 - 47 0 0 -27 40 42 3 2 45.8 10 245 -54 -27 46 2 -27 35 22 -27 49 46 -27 31 39 0.76 - 46 0 0 -27 7 4 3 2 47.0 9 244 -55 -27 12 23 -27 1 44 -27 16 6 -26 58 2 0.77 - 45 0 0 -26 33 37 3 2 48.1 8 244 -55 -26 38 56 -26 28 19 -26 42 38 -26 24 38 0.77 - 44 0 0 -26 0 24 3 2 49.0 7 243 -55 -26 5 42 -25 55 7 -26 9 23 -25 51 26 0.79 - 43 0 0 -25 27 25 3 2 49.8 6 243 -56 -25 32 42 -25 22 9 -25 36 23 -25 18 29 0.80 - 42 0 0 -24 54 42 3 2 50.4 5 243 -56 -24 59 57 -24 49 27 -25 3 37 -24 45 48 0.82 - 41 0 0 -24 22 15 3 2 50.9 4 242 -56 -24 27 29 -24 17 1 -24 31 9 -24 13 22 0.86 - 40 0 0 -23 50 5 3 2 51.3 3 242 -57 -23 55 19 -23 44 52 -23 58 57 -23 41 15 0.92 - 39 0 0 -23 18 14 3 2 51.6 2 241 -57 -23 23 26 -23 13 2 -23 27 4 -23 9 25 1.07 - 38 0 0 -22 46 42 3 2 51.7 0 241 -57 -22 51 53 -22 41 32 -22 55 30 -22 37 55 1.86 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 316-227257 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 15 45.0854 DE: -26 51 02.160 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 15 45.0854 DE: -26 51 02.160 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 10.7 * B mag [mag]: 11.8 * Diameter [mas]: 0.20 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (782) Montefiore asteroid class: approx. diameter [km]: 13 approx. diameter ["]: 0.009 distance from Earth [AU]: 2.09160 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#59 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): 0.011", 0.003", 85.853° remarks: * orbital elements for (782)Montefiore : Mean anomaly = 148.0774502187 deg Arg. of pericenter = 82.5144235796 deg Long. of node = 80.4101539709 deg Inclination = 5.2598977710 deg Eccentricity = 0.0392507046 Semimajor axis = 2.1796849396 AU Perihelion dist = 2.0941307701 AU Mag: H = 11.38, G = 0.15 Epoch of elements : MJD 60597.12397766 TDT (2024 Oct 14.1240) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#592023Apr24,0.67,2024,10,14,2.975468,0.090627,-0.559012,11.256264,1.831073,0.005446,0.000694,0.000000,0.000000 -138.4665,-26.8085,131.86,-8.30,False UCAC4 316-227257,19.26252377,-26.8506000,11.78,10.65,10.04,0.2,0,,19.28803437,-26.8084925,5.29,5.45,0,0,0 782,Montefiore,15.94,13.631,2.0916,0,0,3.535,7.70,,0.8,0 0,148.0395,2024,10,14,82.5144,80.4102,5.2599,0.03925,2.17968,2.09413,11.38,5.0,0.15 1.348,0.0110,0.0030,86,0.0031,Known errors,1.15,0,-1,-1 20241014_227257,60140.63 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:11 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org