IOTA/IOTA-ES occultation update for (249) Ilse / UCAC4 260-159250 event on 2024 Jun 24, 11:41 UT Visible from Summary ------- On 2024 Jun 24 UT, the 37.0764941203422 km diameter asteroid (249) Ilse will occult a 12.0 mag star in the constellation Corona Australis for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.52 mag to 14.39 mag (the magnitude of the asteroid) for at most 3.470 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 Jun 24, 11:32 - 2024 Jun 24, 11:50 * geocentric midpoint of event [JD]: 2460485.98707188 * magnitude of target star: 11.98 * magnitude drop [mag]: 2.52 * estimated maximum duration [s]: 3.470 * Moon: 93 % sunlit, 34° distance * Sun: 165° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 41 * 1 sigma uncertainty interval [path widths]: +/- 0.12 * 1 sigma uncertainty interval [seconds]: +/- 2.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.021, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.021", 0.003", 87°) * approx speed of asteroid's shadow [km/s]: 10.7654 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 260-159250 by 249 Ilse on 2024 Jun 24 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 80 0 0 .. .. .... .. .. .. .. .. .. .. .. .. -14 38 1 .. .. .. -14 41 26 .... 81 0 0 -15 12 21 11 50 26.8 1 129 5 -14 58 8 -15 26 37 -14 54 43 -15 30 2 .... 82 0 0 -16 1 8 11 50 26.4 2 129 3 -15 46 52 -16 15 26 -15 43 26 -16 18 53 0.38 83 0 0 -16 50 7 11 50 25.6 4 129 2 -16 35 47 -17 4 28 -16 32 21 -17 7 55 0.39 84 0 0 -17 39 15 11 50 24.5 5 129 1 -17 24 53 -17 53 39 -17 21 27 -17 57 7 0.39 85 0 0 -18 28 32 11 50 23.1 6 128 0 -18 14 7 -18 42 58 -18 10 40 -18 46 26 0.40 86 0 0 -19 17 53 11 50 21.4 7 128 -1 -19 3 27 -19 32 22 -18 59 59 -19 35 51 0.40 87 0 0 -20 7 19 11 50 19.5 9 128 -3 -19 52 50 -20 21 50 -19 49 21 -20 25 19 0.40 88 0 0 -20 56 45 11 50 17.2 10 127 -4 -20 42 14 -21 11 18 -20 38 45 -21 14 48 0.40 89 0 0 -21 46 10 11 50 14.6 11 127 -5 -21 31 37 -22 0 45 -21 28 8 -22 4 15 0.40 90 0 0 -22 35 32 11 50 11.8 12 126 -6 -22 20 58 -22 50 9 -22 17 28 -22 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20 -31 51 18 -32 27 53 0.44 - 77 0 0 -31 23 2 11 32 38.2 14 234 -7 -31 8 18 -31 37 49 -31 4 46 -31 41 22 0.44 - 76 0 0 -30 36 3 11 32 35.2 13 233 -6 -30 21 18 -30 50 50 -30 17 46 -30 54 23 0.44 - 75 0 0 -29 48 37 11 32 32.5 12 232 -5 -29 33 52 -30 3 25 -29 30 20 -30 6 58 0.44 - 74 0 0 -29 0 48 11 32 29.9 10 232 -4 -28 46 3 -29 15 35 -28 42 30 -29 19 8 0.45 - 73 0 0 -28 12 36 11 32 27.6 9 232 -3 -27 57 51 -28 27 23 -27 54 19 -28 30 56 0.45 - 72 0 0 -27 24 3 11 32 25.6 8 231 -2 -27 9 19 -27 38 50 -27 5 47 -27 42 24 0.46 - 71 0 0 -26 35 12 11 32 23.9 7 231 -1 -26 20 28 -26 49 59 -26 16 56 -26 53 32 0.47 - 70 0 0 -25 46 5 11 32 22.4 6 230 0 -25 31 21 -26 0 50 -25 27 50 -26 4 23 0.49 - 69 0 0 -24 56 43 11 32 21.1 4 230 2 -24 42 0 -25 11 28 -24 38 29 -25 15 0 0.51 - 68 0 0 -24 7 9 11 32 20.2 3 229 3 -23 52 28 -24 21 52 -23 48 56 -24 25 25 0.55 - 67 0 0 -23 17 25 11 32 19.6 2 229 4 -23 2 45 -23 32 7 -22 59 14 -23 35 39 0.64 - 66 0 0 -22 27 33 11 32 19.2 1 228 5 -22 12 55 -22 42 14 -22 9 24 -22 45 46 1.08 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 14.4 Data for the target star ------------------------ * name: UCAC4 260-159250 * constellation : Corona Australis * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 07 46.4133 DE: -38 08 53.491 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 07 46.4133 DE: -38 08 53.491 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 12.0 * B mag [mag]: 13.8 * Diameter [mas]: 0.30 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (249) Ilse asteroid class: approx. diameter [km]: 37 approx. diameter ["]: 0.036 distance from Earth [AU]: 1.40410 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#46 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): 0.021", 0.003", 87.1° remarks: * orbital elements for (249)Ilse : Mean anomaly = 279.8750237797 deg Arg. of pericenter = 42.2550493056 deg Long. of node = 334.6705210356 deg Inclination = 9.6197038947 deg Eccentricity = 0.2171037513 Semimajor axis = 2.3778769050 AU Perihelion dist = 1.8616309088 AU Mag: H = 11.27, G = 0.15 Epoch of elements : MJD 60485.48707250 TDT (2024 Jun 24.4871) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#462023Apr24,3.47,2024,6,24,11.689725,-0.034154,-0.394196,-6.053620,0.524499,0.000101,0.001366,0.000001,0.000000 -176.0959,-38.1453,5.30,23.39,False UCAC4 260-159250,18.12955926,-38.1481919,13.83,11.98,10.98,0.3,4,,18.15801016,-38.1453318,2.52,3.03,0,0,0 249,Ilse,14.39,37.382,1.4041,0,0,-3.213,3.29,,2.0,0 0,279.7441,2024,6,24,42.2550,334.6705,9.6197,0.21710,2.37788,1.86163,11.27,5.0,0.15 1.120,0.0213,0.0033,87,0.0044,Known errors,1.02,0,-1,-1 20240624_159250,60139.40 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 09:36 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org