IOTA/IOTA-ES occultation update for (249) Ilse / TYC 7378-02439-1 event on 2024 Sep 19, 17:46 UT Visible from Summary ------- On 2024 Sep 19 UT, the 37.147 km diameter asteroid (249) Ilse will occult a 10.4 mag star in the constellation Scorpius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.20 mag to 15.58 mag (the magnitude of the asteroid) for at most 2.290 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 Sep 19, 17:39 - 2024 Sep 19, 17:52 * geocentric midpoint of event [JD]: 2460573.24049388 * magnitude of target star: 10.39 * magnitude drop [mag]: 5.20 * estimated maximum duration [s]: 2.290 * Moon: 96 % sunlit, 111° distance * Sun: 93° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 38 * 1 sigma uncertainty interval [path widths]: +/- 0.14 * 1 sigma uncertainty interval [seconds]: +/- 1.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.015", 0.002", 84°) * approx speed of asteroid's shadow [km/s]: 16.2020 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7378-02439-1 by 249 Ilse on 2024 Sep 19 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 - 86 0 0 - 3 43 19 17 39 57.2 0 120 85 - 3 55 18 - 3 31 20 - 3 58 32 - 3 28 5 .... - 85 0 0 - 4 18 9 17 39 57.3 2 120 84 - 4 30 6 - 4 6 12 - 4 33 19 - 4 2 58 -0.05 - 84 0 0 - 4 52 28 17 39 57.6 3 120 84 - 5 4 22 - 4 40 34 - 5 7 35 - 4 37 20 -0.13 - 83 0 0 - 5 26 16 17 39 58.1 4 120 83 - 5 38 7 - 5 14 24 - 5 41 19 - 5 11 11 -0.16 - 82 0 0 - 5 59 31 17 39 58.7 5 120 82 - 6 11 20 - 5 47 41 - 6 14 31 - 5 44 29 -0.18 - 81 0 0 - 6 32 13 17 39 59.5 6 120 81 - 6 43 59 - 6 20 26 - 6 47 10 - 6 17 15 -0.19 - 80 0 0 - 7 4 21 17 40 0.4 7 120 80 - 7 16 5 - 6 52 37 - 7 19 15 - 6 49 26 -0.20 - 79 0 0 - 7 35 56 17 40 1.5 8 120 78 - 7 47 37 - 7 24 14 - 7 50 47 - 7 21 4 -0.21 - 78 0 0 - 8 6 56 17 40 2.7 10 119 77 - 8 18 35 - 7 55 17 - 8 21 43 - 7 52 8 -0.21 - 77 0 0 - 8 37 21 17 40 4.1 11 119 76 - 8 48 57 - 8 25 44 - 8 52 5 - 8 22 36 -0.21 - 76 0 0 - 9 7 10 17 40 5.7 12 119 75 - 9 18 44 - 8 55 36 - 9 21 51 - 8 52 29 -0.22 - 75 0 0 - 9 36 24 17 40 7.3 13 119 74 - 9 47 55 - 9 24 53 - 9 51 2 - 9 21 46 -0.22 - 74 0 0 -10 5 2 17 40 9.1 14 119 73 -10 16 30 - 9 53 33 -10 19 36 - 9 50 26 -0.22 - 73 0 0 -10 33 3 17 40 11.1 15 119 72 -10 44 29 -10 21 37 -10 47 34 -10 18 31 -0.22 - 72 0 0 -11 0 28 17 40 13.1 16 119 71 -11 11 51 -10 49 4 -11 14 56 -10 45 59 -0.23 - 71 0 0 -11 27 15 17 40 15.4 17 118 70 -11 38 36 -11 15 54 -11 41 40 -11 12 49 -0.23 - 70 0 0 -11 53 26 17 40 17.7 18 118 69 -12 4 44 -11 42 7 -12 7 47 -11 39 3 -0.23 - 69 0 0 -12 18 59 17 40 20.2 19 118 68 -12 30 15 -12 7 42 -12 33 17 -12 4 39 -0.23 - 68 0 0 -12 43 54 17 40 22.7 20 118 67 -12 55 8 -12 32 40 -12 58 10 -12 29 38 -0.23 - 67 0 0 -13 8 12 17 40 25.4 21 118 66 -13 19 23 -12 57 0 -13 22 25 -12 53 58 -0.23 - 66 0 0 -13 31 52 17 40 28.2 23 118 65 -13 43 1 -13 20 43 -13 46 2 -13 17 42 -0.23 - 65 0 0 -13 54 55 17 40 31.2 24 117 64 -14 6 1 -13 43 47 -14 9 1 -13 40 47 -0.23 - 64 0 0 -14 17 19 17 40 34.2 25 117 63 -14 28 23 -14 6 14 -14 31 23 -14 3 14 -0.24 - 63 0 0 -14 39 5 17 40 37.4 26 117 62 -14 50 8 -14 28 2 -14 53 7 -14 25 3 -0.24 - 62 0 0 -15 0 14 17 40 40.6 27 117 61 -15 11 14 -14 49 13 -15 14 12 -14 46 14 -0.24 - 61 0 0 -15 20 44 17 40 44.0 28 117 60 -15 31 42 -15 9 45 -15 34 40 -15 6 47 -0.24 - 60 0 0 -15 40 36 17 40 47.5 29 116 59 -15 51 32 -15 29 40 -15 54 30 -15 26 42 -0.24 - 59 0 0 -15 59 51 17 40 51.0 30 116 58 -16 10 45 -15 48 56 -16 13 42 -15 45 59 -0.24 - 58 0 0 -16 18 27 17 40 54.7 31 116 57 -16 29 19 -16 7 35 -16 32 15 -16 4 38 -0.24 - 57 0 0 -16 36 25 17 40 58.4 32 116 56 -16 47 16 -16 25 35 -16 50 11 -16 22 39 -0.24 - 56 0 0 -16 53 46 17 41 2.3 33 116 55 -17 4 34 -16 42 57 -17 7 29 -16 40 2 -0.24 - 55 0 0 -17 10 29 17 41 6.2 34 115 54 -17 21 15 -16 59 41 -17 24 10 -16 56 46 -0.24 - 54 0 0 -17 26 33 17 41 10.2 35 115 53 -17 37 18 -17 15 48 -17 40 12 -17 12 53 -0.24 - 53 0 0 -17 42 0 17 41 14.3 36 115 52 -17 52 43 -17 31 17 -17 55 37 -17 28 23 -0.24 - 52 0 0 -17 56 50 17 41 18.5 37 115 51 -18 7 31 -17 46 8 -18 10 25 -17 43 14 -0.24 - 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39 0 0 -20 12 56 17 42 19.9 49 113 38 -20 23 22 -20 2 29 -20 26 11 -19 59 39 -0.25 - 38 0 0 -20 19 5 17 42 25.1 50 113 37 -20 29 31 -20 8 39 -20 32 20 -20 5 49 -0.25 - 37 0 0 -20 24 38 17 42 30.4 51 113 36 -20 35 3 -20 14 12 -20 37 52 -20 11 23 -0.25 - 36 0 0 -20 29 34 17 42 35.7 52 113 35 -20 39 58 -20 19 9 -20 42 47 -20 16 20 -0.25 - 35 0 0 -20 33 53 17 42 41.1 53 113 34 -20 44 17 -20 23 29 -20 47 6 -20 20 40 -0.25 - 34 0 0 -20 37 36 17 42 46.5 54 114 34 -20 48 0 -20 27 12 -20 50 48 -20 24 23 -0.25 - 33 0 0 -20 40 43 17 42 52.0 55 114 33 -20 51 6 -20 30 19 -20 53 54 -20 27 30 -0.25 - 32 0 0 -20 43 12 17 42 57.6 55 114 32 -20 53 35 -20 32 49 -20 56 24 -20 30 0 -0.25 - 31 0 0 -20 45 6 17 43 3.2 56 114 31 -20 55 28 -20 34 43 -20 58 17 -20 31 54 -0.25 - 30 0 0 -20 46 22 17 43 8.9 57 114 30 -20 56 45 -20 35 59 -20 59 33 -20 33 11 -0.25 - 29 0 0 -20 47 3 17 43 14.7 58 114 29 -20 57 25 -20 36 40 -21 0 13 -20 33 51 -0.25 - 28 0 0 -20 47 6 17 43 20.4 59 115 28 -20 57 29 -20 36 43 -21 0 17 -20 33 55 -0.25 - 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9 56 44 17 48 25.6 66 210 -16 -10 8 17 - 9 45 10 -10 11 25 - 9 42 2 -0.25 18 0 0 - 9 27 16 17 48 32.9 65 211 -17 - 9 38 52 - 9 15 39 - 9 42 0 - 9 12 31 -0.25 19 0 0 - 8 57 9 17 48 40.2 64 212 -18 - 9 8 48 - 8 45 30 - 9 11 57 - 8 42 20 -0.25 20 0 0 - 8 26 24 17 48 47.4 63 213 -19 - 8 38 6 - 8 14 42 - 8 41 15 - 8 11 32 -0.25 21 0 0 - 7 55 1 17 48 54.6 62 214 -20 - 8 6 46 - 7 43 16 - 8 9 56 - 7 40 5 -0.25 22 0 0 - 7 23 1 17 49 1.8 61 215 -21 - 7 34 48 - 7 11 13 - 7 37 59 - 7 8 1 -0.25 23 0 0 - 6 50 23 17 49 8.9 60 216 -22 - 7 2 13 - 6 38 32 - 7 5 25 - 6 35 20 -0.25 24 0 0 - 6 17 9 17 49 16.0 59 216 -23 - 6 29 2 - 6 5 15 - 6 32 15 - 6 2 2 -0.25 25 0 0 - 5 43 19 17 49 23.1 58 217 -24 - 5 55 15 - 5 31 23 - 5 58 28 - 5 28 9 -0.25 26 0 0 - 5 8 53 17 49 30.1 57 218 -25 - 5 20 52 - 4 56 54 - 5 24 6 - 4 53 40 -0.25 27 0 0 - 4 33 53 17 49 37.1 56 218 -26 - 4 45 55 - 4 21 51 - 4 49 10 - 4 18 36 -0.25 28 0 0 - 3 58 19 17 49 44.0 55 219 -27 - 4 10 23 - 3 46 14 - 4 13 39 - 3 42 58 -0.25 29 0 0 - 3 22 12 17 49 50.8 54 219 -28 - 3 34 19 - 3 10 4 - 3 37 35 - 3 6 47 -0.25 30 0 0 - 2 45 32 17 49 57.6 53 220 -29 - 2 57 41 - 2 33 22 - 3 0 59 - 2 30 4 -0.24 31 0 0 - 2 8 21 17 50 4.3 51 220 -30 - 2 20 33 - 1 56 8 - 2 23 51 - 1 52 49 -0.24 32 0 0 - 1 30 39 17 50 10.9 50 221 -31 - 1 42 53 - 1 18 23 - 1 46 12 - 1 15 4 -0.24 33 0 0 - 0 52 27 17 50 17.4 49 221 -32 - 1 4 44 - 0 40 9 - 1 8 4 - 0 36 49 -0.24 34 0 0 - 0 13 47 17 50 23.8 48 222 -33 - 0 26 7 - 0 1 26 - 0 29 27 0 1 54 -0.24 35 0 0 0 25 21 17 50 30.1 47 222 -34 0 12 58 0 37 44 0 9 38 0 41 5 -0.24 36 0 0 1 4 54 17 50 36.4 46 222 -35 0 52 30 1 17 20 0 49 8 1 20 42 -0.24 37 0 0 1 44 53 17 50 42.5 44 223 -36 1 32 26 1 57 21 1 29 4 2 0 43 -0.24 38 0 0 2 25 16 17 50 48.5 43 223 -37 2 12 47 2 37 46 2 9 24 2 41 9 -0.24 39 0 0 3 6 1 17 50 54.4 42 223 -38 2 53 30 3 18 33 2 50 6 3 21 57 -0.24 40 0 0 3 47 7 17 51 0.2 41 224 -39 3 34 34 3 59 42 3 31 10 4 3 6 -0.24 41 0 0 4 28 33 17 51 5.8 40 224 -40 4 15 57 4 41 9 4 12 33 4 44 34 -0.24 42 0 0 5 10 17 17 51 11.3 38 224 -41 4 57 40 5 22 55 4 54 15 5 26 21 -0.24 43 0 0 5 52 18 17 51 16.6 37 224 -42 5 39 38 6 4 58 5 36 13 6 8 23 -0.24 44 0 0 6 34 33 17 51 21.9 36 225 -43 6 21 52 6 47 15 6 18 27 6 50 41 -0.24 45 0 0 7 17 3 17 51 26.9 35 225 -44 7 4 20 7 29 46 7 0 54 7 33 13 -0.24 46 0 0 7 59 44 17 51 31.9 34 225 -45 7 47 0 8 12 29 7 43 33 8 15 56 -0.24 47 0 0 8 42 36 17 51 36.6 32 226 -46 8 29 50 8 55 22 8 26 23 8 58 49 -0.24 48 0 0 9 25 36 17 51 41.2 31 226 -46 9 12 49 9 38 23 9 9 22 9 41 51 -0.24 49 0 0 10 8 43 17 51 45.7 30 226 -47 9 55 55 10 21 32 9 52 27 10 25 0 -0.24 50 0 0 10 51 55 17 51 49.9 29 226 -48 10 39 6 11 4 45 10 35 39 11 8 13 -0.24 51 0 0 11 35 11 17 51 54.0 28 227 -49 11 22 21 11 48 2 11 18 53 11 51 30 -0.24 52 0 0 12 18 29 17 51 58.0 26 227 -50 12 5 38 12 31 20 12 2 10 12 34 49 -0.24 53 0 0 13 1 47 17 52 1.7 25 227 -50 12 48 56 13 14 39 12 45 27 13 18 8 -0.24 54 0 0 13 45 3 17 52 5.3 24 228 -51 13 32 11 13 57 56 13 28 43 14 1 25 -0.24 55 0 0 14 28 16 17 52 8.7 23 228 -52 14 15 24 14 41 9 14 11 55 14 44 38 -0.24 56 0 0 15 11 24 17 52 11.9 21 228 -52 14 58 32 15 24 17 14 55 3 15 27 47 -0.24 57 0 0 15 54 26 17 52 15.0 20 228 -53 15 41 33 16 7 19 15 38 4 16 10 48 -0.24 58 0 0 16 37 19 17 52 17.8 19 229 -54 16 24 26 16 50 12 16 20 58 16 53 41 -0.24 59 0 0 17 20 2 17 52 20.5 18 229 -54 17 7 10 17 32 55 17 3 41 17 36 25 -0.24 60 0 0 18 2 34 17 52 23.0 17 229 -55 17 49 42 18 15 27 17 46 13 18 18 56 -0.23 61 0 0 18 44 53 17 52 25.3 16 230 -55 18 32 1 18 57 45 18 28 33 19 1 14 -0.23 62 0 0 19 26 57 17 52 27.5 14 230 -56 19 14 6 19 39 49 19 10 38 19 43 18 -0.23 63 0 0 20 8 46 17 52 29.5 13 231 -56 19 55 55 20 21 37 19 52 27 20 25 6 -0.23 64 0 0 20 50 17 17 52 31.2 12 231 -56 20 37 27 21 3 7 20 33 59 21 6 36 -0.23 65 0 0 21 31 29 17 52 32.9 11 231 -57 21 18 40 21 44 19 21 15 12 21 47 47 -0.23 66 0 0 22 12 21 17 52 34.3 10 232 -57 21 59 33 22 25 10 21 56 6 22 28 38 -0.23 67 0 0 22 52 52 17 52 35.6 9 232 -57 22 40 5 23 5 40 22 36 38 23 9 7 -0.23 68 0 0 23 33 0 17 52 36.7 7 232 -57 23 20 15 23 45 47 23 16 48 23 49 14 -0.23 69 0 0 24 12 45 17 52 37.6 6 233 -57 24 0 1 24 25 30 23 56 35 24 28 57 -0.23 70 0 0 24 52 5 17 52 38.4 5 233 -58 24 39 22 25 4 49 24 35 56 25 8 15 -0.23 71 0 0 25 30 59 17 52 39.0 4 234 -58 25 18 18 25 43 41 25 14 53 25 47 8 -0.23 72 0 0 26 9 27 17 52 39.5 3 234 -58 25 56 47 26 22 7 25 53 22 26 25 33 -0.22 73 0 0 26 47 27 17 52 39.8 2 235 -58 26 34 49 27 0 5 26 31 24 27 3 31 -0.21 74 0 0 27 24 58 17 52 40.0 1 235 -58 27 12 22 27 37 35 27 8 58 27 41 0 -0.17 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: TYC 7378-02439-1 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 57 35.0321 DE: -30 15 38.366 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 57 35.0320 DE: -30 15 38.366 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.4 * B mag [mag]: 10.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (249) Ilse asteroid class: approx. diameter [km]: 37 approx. diameter ["]: 0.027 distance from Earth [AU]: 1.89840 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): 0.015", 0.002", 84.371° remarks: * orbital elements for (249)Ilse : Mean anomaly = 303.3139401984 deg Arg. of pericenter = 42.2708168690 deg Long. of node = 334.6682926931 deg Inclination = 9.6199976735 deg Eccentricity = 0.2170824789 Semimajor axis = 2.3777345629 AU Perihelion dist = 1.8615700498 AU Mag: H = 11.27, G = 0.15 Epoch of elements : MJD 60572.74049359 TDT (2024 Sep 19.7405) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#462023Apr24,2.29,2024,9,19,17.771853,-0.077314,0.233526,8.683238,2.868813,0.005352,0.000021,0.000000,0.000000 4.0931,-30.2650,-88.20,1.08,False TYC 7378-02439-1,17.95973117,-30.2606573,10.56,10.39,10.30,0.0,0,,17.98616134,-30.2649986,5.20,4.85,0,0,0 249,Ilse,15.58,37.147,1.8984,0,0,3.105,13.29,,2.0,0 0,303.1149,2024,9,19,42.2708,334.6683,9.6200,0.21708,2.37773,1.86157,11.27,5.0,0.15 1.135,0.0147,0.0018,84,0.0037,Known errors,0.63,0,-1,-1 20240919_2439-1,60140.57 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 13:44 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org