IOTA/IOTA-ES occultation update for (4648) Tirion / UCAC4 612-040493 event on 2024 Oct 21, 05:31 UT Visible from Summary ------- On 2024 Oct 21 UT, the 10.927 km diameter asteroid (4648) Tirion will occult a 11.9 mag star in the constellation Gemini for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.23 mag to 17.15 mag (the magnitude of the asteroid) for at most 0.700 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: 90 * date and approx. time of event: 2024 Oct 21, 05:24 - 2024 Oct 21, 05:37 * geocentric midpoint of event [JD]: 2460604.72997562 * magnitude of target star: 11.93 * magnitude drop [mag]: 5.23 * estimated maximum duration [s]: 0.700 * Moon: 81 % sunlit, 32° distance * Sun: 97° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 12 * 1 sigma uncertainty interval [path widths]: +/- 0.52 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.018, +/- 0.007) * 1 sigma uncertainty ellipse (major, minor, PA): (0.019", 0.001", 110°) * approx speed of asteroid's shadow [km/s]: 15.6735 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 612-040493 by 4648 Tirion on 2024 Oct 21 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 - 78 0 0 -12 41 33 5 24 48.2 0 57 -65 -12 45 19 -12 37 48 -12 49 11 -12 33 56 .... - 77 0 0 -12 3 9 5 24 48.3 2 56 -66 -12 6 54 -11 59 24 -12 10 46 -11 55 32 0.10 - 76 0 0 -11 24 57 5 24 48.7 3 56 -66 -11 28 41 -11 21 12 -11 32 32 -11 17 21 0.21 - 75 0 0 -10 46 59 5 24 49.2 4 56 -66 -10 50 43 -10 43 15 -10 54 33 -10 39 24 0.25 - 74 0 0 -10 9 16 5 24 49.9 5 56 -66 -10 12 59 -10 5 33 -10 16 49 -10 1 43 0.28 - 73 0 0 - 9 31 49 5 24 50.7 6 56 -66 - 9 35 31 - 9 28 6 - 9 39 21 - 9 24 17 0.29 - 72 0 0 - 8 54 39 5 24 51.8 7 56 -66 - 8 58 21 - 8 50 57 - 9 2 10 - 8 47 9 0.30 - 71 0 0 - 8 17 49 5 24 53.0 9 55 -66 - 8 21 30 - 8 14 7 - 8 25 18 - 8 10 19 0.31 - 70 0 0 - 7 41 17 5 24 54.4 10 55 -66 - 7 44 58 - 7 37 37 - 7 48 46 - 7 33 49 0.31 - 69 0 0 - 7 5 7 5 24 56.0 11 55 -66 - 7 8 47 - 7 1 27 - 7 12 35 - 6 57 40 0.32 - 68 0 0 - 6 29 19 5 24 57.7 12 55 -66 - 6 32 58 - 6 25 40 - 6 36 45 - 6 21 53 0.32 - 67 0 0 - 5 53 54 5 24 59.6 13 55 -65 - 5 57 33 - 5 50 15 - 6 1 18 - 5 46 30 0.33 - 66 0 0 - 5 18 52 5 25 1.7 14 55 -65 - 5 22 31 - 5 15 14 - 5 26 16 - 5 11 30 0.33 - 65 0 0 - 4 44 16 5 25 4.0 16 55 -65 - 4 47 53 - 4 40 39 - 4 51 38 - 4 36 55 0.33 - 64 0 0 - 4 10 5 5 25 6.4 17 55 -64 - 4 13 42 - 4 6 29 - 4 17 26 - 4 2 46 0.33 - 63 0 0 - 3 36 22 5 25 9.0 18 54 -64 - 3 39 58 - 3 32 46 - 3 43 41 - 3 29 3 0.33 - 62 0 0 - 3 3 5 5 25 11.7 19 54 -63 - 3 6 41 - 2 59 30 - 3 10 23 - 2 55 48 0.34 - 61 0 0 - 2 30 18 5 25 14.6 20 54 -62 - 2 33 52 - 2 26 43 - 2 37 34 - 2 23 2 0.34 - 60 0 0 - 1 57 59 5 25 17.7 21 54 -62 - 2 1 33 - 1 54 25 - 2 5 13 - 1 50 45 0.34 - 59 0 0 - 1 26 10 5 25 20.9 22 54 -61 - 1 29 43 - 1 22 37 - 1 33 23 - 1 18 58 0.34 - 58 0 0 - 0 54 52 5 25 24.3 23 54 -60 - 0 58 24 - 0 51 20 - 1 2 3 - 0 47 41 0.34 - 57 0 0 - 0 24 5 5 25 27.8 25 54 -60 - 0 27 37 - 0 20 33 - 0 31 15 - 0 16 55 0.34 - 56 0 0 0 6 10 5 25 31.4 26 54 -59 0 2 39 0 9 41 - 0 0 58 0 13 18 0.34 - 55 0 0 0 35 53 5 25 35.2 27 54 -58 0 32 23 0 39 23 0 28 46 0 43 0 0.35 - 54 0 0 1 5 3 5 25 39.1 28 54 -57 1 1 33 1 8 32 0 57 57 1 12 8 0.35 - 53 0 0 1 33 39 5 25 43.1 29 53 -57 1 30 10 1 37 8 1 26 35 1 40 43 0.35 - 52 0 0 2 1 41 5 25 47.3 30 53 -56 1 58 13 2 5 9 1 54 39 2 8 44 0.35 - 51 0 0 2 29 9 5 25 51.6 31 53 -55 2 25 42 2 32 36 2 22 8 2 36 10 0.35 - 50 0 0 2 56 3 5 25 56.0 32 53 -54 2 52 36 2 59 29 2 49 3 3 3 2 0.35 - 49 0 0 3 22 21 5 26 0.6 33 53 -53 3 18 55 3 25 46 3 15 22 3 29 19 0.35 - 48 0 0 3 48 3 5 26 5.2 34 53 -52 3 44 38 3 51 28 3 41 6 3 55 0 0.35 - 47 0 0 4 13 10 5 26 10.0 35 53 -51 4 9 46 4 16 34 4 6 15 4 20 5 0.35 - 46 0 0 4 37 41 5 26 14.9 37 53 -50 4 34 17 4 41 4 4 30 47 4 44 34 0.35 - 45 0 0 5 1 35 5 26 19.9 38 52 -50 4 58 12 5 4 58 4 54 42 5 8 27 0.35 - 44 0 0 5 24 53 5 26 25.0 39 52 -49 5 21 30 5 28 15 5 18 2 5 31 44 0.35 - 43 0 0 5 47 34 5 26 30.1 40 52 -48 5 44 12 5 50 56 5 40 44 5 54 24 0.35 - 42 0 0 6 9 38 5 26 35.4 41 52 -47 6 6 17 6 12 59 6 2 49 6 16 26 0.36 - 41 0 0 6 31 5 5 26 40.8 42 52 -46 6 27 44 6 34 25 6 24 18 6 37 52 0.36 - 40 0 0 6 51 55 5 26 46.3 43 52 -45 6 48 35 6 55 14 6 45 8 6 58 40 0.36 - 39 0 0 7 12 7 5 26 51.8 44 51 -44 7 8 48 7 15 26 7 5 22 7 18 51 0.36 - 38 0 0 7 31 42 5 26 57.4 45 51 -43 7 28 23 7 35 0 7 24 58 7 38 25 0.36 - 37 0 0 7 50 39 5 27 3.1 46 51 -42 7 47 20 7 53 57 7 43 56 7 57 21 0.36 - 36 0 0 8 8 58 5 27 8.9 47 51 -41 8 5 40 8 12 16 8 2 17 8 15 39 0.36 - 35 0 0 8 26 40 5 27 14.8 48 50 -40 8 23 23 8 29 57 8 19 59 8 33 20 0.36 - 34 0 0 8 43 44 5 27 20.7 49 50 -39 8 40 27 8 47 0 8 37 4 8 50 23 0.36 - 33 0 0 9 0 10 5 27 26.7 50 50 -38 8 56 53 9 3 26 8 53 31 9 6 48 0.36 - 32 0 0 9 15 58 5 27 32.8 50 49 -37 9 12 42 9 19 13 9 9 20 9 22 35 0.36 - 31 0 0 9 31 8 5 27 38.9 51 49 -36 9 27 53 9 34 23 9 24 31 9 37 44 0.36 - 30 0 0 9 45 40 5 27 45.1 52 48 -35 9 42 25 9 48 55 9 39 5 9 52 15 0.36 - 29 0 0 9 59 34 5 27 51.4 53 48 -34 9 56 20 10 2 49 9 53 0 10 6 9 0.36 - 28 0 0 10 12 51 5 27 57.7 54 47 -33 10 9 37 10 16 5 10 6 17 10 19 24 0.36 - 27 0 0 10 25 29 5 28 4.0 55 47 -32 10 22 16 10 28 43 10 18 57 10 32 2 0.36 - 26 0 0 10 37 30 5 28 10.5 56 46 -31 10 34 17 10 40 43 10 30 58 10 44 2 0.36 - 25 0 0 10 48 53 5 28 16.9 57 45 -30 10 45 40 10 52 5 10 42 22 10 55 24 0.36 - 24 0 0 10 59 38 5 28 23.4 58 45 -29 10 56 25 11 2 50 10 53 7 11 6 8 0.36 - 23 0 0 11 9 45 5 28 30.0 58 44 -28 11 6 33 11 12 57 11 3 15 11 16 14 0.37 - 22 0 0 11 19 14 5 28 36.6 59 43 -27 11 16 2 11 22 26 11 12 45 11 25 43 0.37 - 21 0 0 11 28 5 5 28 43.3 60 42 -26 11 24 54 11 31 17 11 21 37 11 34 34 0.37 - 20 0 0 11 36 19 5 28 50.0 61 41 -25 11 33 8 11 39 30 11 29 51 11 42 47 0.37 - 19 0 0 11 43 55 5 28 56.7 62 40 -24 11 40 44 11 47 6 11 37 27 11 50 22 0.37 - 18 0 0 11 50 53 5 29 3.5 62 39 -23 11 47 42 11 54 4 11 44 26 11 57 20 0.37 - 17 0 0 11 57 14 5 29 10.3 63 38 -22 11 54 3 12 0 24 11 50 47 12 3 40 0.37 - 16 0 0 12 2 56 5 29 17.1 64 37 -21 11 59 46 12 6 7 11 56 30 12 9 23 0.37 - 15 0 0 12 8 1 5 29 24.0 64 35 -20 12 4 51 12 11 11 12 1 35 12 14 27 0.37 - 14 0 0 12 12 29 5 29 30.9 65 34 -19 12 9 19 12 15 39 12 6 3 12 18 54 0.37 - 13 0 0 12 16 19 5 29 37.8 66 32 -18 12 13 9 12 19 28 12 9 53 12 22 44 0.37 - 12 0 0 12 19 31 5 29 44.8 66 31 -17 12 16 21 12 22 41 12 13 6 12 25 56 0.37 - 11 0 0 12 22 6 5 29 51.7 67 29 -16 12 18 56 12 25 15 12 15 40 12 28 30 0.37 - 10 0 0 12 24 3 5 29 58.8 67 27 -15 12 20 53 12 27 12 12 17 37 12 30 27 0.37 - 9 0 0 12 25 22 5 30 5.8 68 25 -14 12 22 12 12 28 31 12 18 57 12 31 47 0.37 - 8 0 0 12 26 4 5 30 12.8 68 23 -13 12 22 54 12 29 13 12 19 39 12 32 28 0.37 - 7 0 0 12 26 8 5 30 19.9 68 21 -12 12 22 58 12 29 17 12 19 43 12 32 32 0.37 - 6 0 0 12 25 34 5 30 27.0 69 19 -11 12 22 25 12 28 44 12 19 9 12 31 59 0.37 - 5 0 0 12 24 23 5 30 34.1 69 17 -10 12 21 14 12 27 33 12 17 58 12 30 48 0.37 - 4 0 0 12 22 34 5 30 41.2 69 14 -9 12 19 25 12 25 44 12 16 9 12 28 59 0.37 - 3 0 0 12 20 8 5 30 48.4 69 12 -8 12 16 58 12 23 18 12 13 43 12 26 33 0.37 - 2 0 0 12 17 4 5 30 55.5 70 9 -7 12 13 54 12 20 14 12 10 38 12 23 29 0.37 - 1 0 0 12 13 22 5 31 2.7 70 7 -6 12 10 12 12 16 32 12 6 56 12 19 48 0.37 0 0 0 12 9 3 5 31 9.8 70 4 -5 12 5 53 12 12 13 12 2 37 12 15 29 0.37 1 0 0 12 4 5 5 31 17.0 70 2 -4 12 0 55 12 7 16 11 57 39 12 10 32 0.37 2 0 0 11 58 30 5 31 24.2 70 359 -3 11 55 20 12 1 41 11 52 3 12 4 57 0.37 3 0 0 11 52 17 5 31 31.4 69 357 -2 11 49 7 11 55 28 11 45 50 11 58 44 0.37 4 0 0 11 45 26 5 31 38.6 69 354 -1 11 42 16 11 48 37 11 38 59 11 51 54 0.37 5 0 0 11 37 58 5 31 45.8 69 352 0 11 34 47 11 41 9 11 31 29 11 44 26 0.37 6 0 0 11 29 51 5 31 53.0 69 350 1 11 26 40 11 33 2 11 23 22 11 36 20 0.37 7 0 0 11 21 6 5 32 0.2 68 347 2 11 17 55 11 24 18 11 14 37 11 27 35 0.37 8 0 0 11 11 43 5 32 7.3 68 345 3 11 8 32 11 14 55 11 5 13 11 18 13 0.37 9 0 0 11 1 43 5 32 14.5 68 343 4 10 58 30 11 4 55 10 55 12 11 8 13 0.37 10 0 0 10 51 4 5 32 21.7 67 341 5 10 47 51 10 54 16 10 44 32 10 57 35 0.37 11 0 0 10 39 46 5 32 28.9 67 339 6 10 36 33 10 42 59 10 33 14 10 46 18 0.37 12 0 0 10 27 51 5 32 36.0 66 338 7 10 24 38 10 31 4 10 21 18 10 34 24 0.37 13 0 0 10 15 17 5 32 43.2 65 336 8 10 12 4 10 18 31 10 8 44 10 21 51 0.37 14 0 0 10 2 5 5 32 50.3 65 334 9 9 58 51 10 5 20 9 55 31 10 8 40 0.37 15 0 0 9 48 15 5 32 57.4 64 333 10 9 45 1 9 51 30 9 41 40 9 54 50 0.37 16 0 0 9 33 47 5 33 4.5 63 331 11 9 30 32 9 37 2 9 27 10 9 40 23 0.37 17 0 0 9 18 40 5 33 11.5 63 330 12 9 15 24 9 21 55 9 12 2 9 25 17 0.37 18 0 0 9 2 55 5 33 18.6 62 329 13 8 59 38 9 6 11 8 56 16 9 9 33 0.37 19 0 0 8 46 31 5 33 25.6 61 328 14 8 43 14 8 49 48 8 39 51 8 53 10 0.37 20 0 0 8 29 29 5 33 32.6 60 326 15 8 26 12 8 32 46 8 22 48 8 36 9 0.37 21 0 0 8 11 49 5 33 39.5 60 325 16 8 8 31 8 15 7 8 5 7 8 18 30 0.37 22 0 0 7 53 30 5 33 46.4 59 324 17 7 50 12 7 56 49 7 46 48 8 0 13 0.37 23 0 0 7 34 34 5 33 53.3 58 324 18 7 31 15 7 37 53 7 27 50 7 41 17 0.37 24 0 0 7 14 59 5 34 0.2 57 323 19 7 11 39 7 18 18 7 8 14 7 21 44 0.37 25 0 0 6 54 46 5 34 7.0 56 322 20 6 51 26 6 58 6 6 47 59 7 1 32 0.37 26 0 0 6 33 55 5 34 13.7 55 321 21 6 30 34 6 37 15 6 27 7 6 40 42 0.37 27 0 0 6 12 26 5 34 20.4 54 320 23 6 9 5 6 15 47 6 5 37 6 19 15 0.37 28 0 0 5 50 19 5 34 27.0 53 320 24 5 46 57 5 53 41 5 43 29 5 57 9 0.36 29 0 0 5 27 35 5 34 33.6 52 319 25 5 24 12 5 30 58 5 20 43 5 34 26 0.36 30 0 0 5 4 13 5 34 40.2 52 319 26 5 0 50 5 7 36 4 57 20 5 11 6 0.36 31 0 0 4 40 14 5 34 46.6 51 318 27 4 36 50 4 43 38 4 33 20 4 47 8 0.36 32 0 0 4 15 38 5 34 53.0 50 318 28 4 12 13 4 19 3 4 8 42 4 22 34 0.36 33 0 0 3 50 25 5 34 59.3 49 317 29 3 47 0 3 53 51 3 43 28 3 57 22 0.36 34 0 0 3 24 36 5 35 5.6 48 317 30 3 21 10 3 28 2 3 17 37 3 31 34 0.36 35 0 0 2 58 10 5 35 11.8 47 316 31 2 54 43 3 1 37 2 51 10 3 5 10 0.36 36 0 0 2 31 9 5 35 17.8 45 316 32 2 27 41 2 34 36 2 24 7 2 38 10 0.36 37 0 0 2 3 32 5 35 23.8 44 316 34 2 0 3 2 7 0 1 56 28 2 10 35 0.36 38 0 0 1 35 20 5 35 29.8 43 315 35 1 31 50 1 38 49 1 28 15 1 42 24 0.36 39 0 0 1 6 33 5 35 35.6 42 315 36 1 3 3 1 10 2 0 59 26 1 13 39 0.36 40 0 0 0 37 12 5 35 41.3 41 315 37 0 33 41 0 40 42 0 30 4 0 44 19 0.36 41 0 0 0 7 17 5 35 46.9 40 314 38 0 3 45 0 10 48 0 0 7 0 14 26 0.36 42 0 0 - 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Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 612-040493 * constellation : Gemini * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 07 37 20.8352 DE: +32 20 29.243 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 07 37 20.8352 DE: +32 20 29.243 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.9 * B mag [mag]: 12.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4648) Tirion asteroid class: approx. diameter [km]: 11 approx. diameter ["]: 0.010 distance from Earth [AU]: 1.55550 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#47 date of fit: 2023 Apr 25 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): 0.019", 0.001", 110.019° remarks: * orbital elements for (4648)Tirion : Mean anomaly = 357.6322863860 deg Arg. of pericenter = 123.5561745677 deg Long. of node = 319.5051962403 deg Inclination = 9.8045277723 deg Eccentricity = 0.1868495974 Semimajor axis = 2.3943771281 AU Perihelion dist = 1.9469887256 AU Mag: H = 13.44, G = 0.15 Epoch of elements : MJD 60604.22997516 TDT (2024 Oct 21.2300) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#472023Apr25,0.70,2024,10,21,5.519415,-0.030315,-0.345230,8.812217,-0.778722,-0.005153,0.000763,0.000000,0.000000 1.7845,32.2854,93.36,-10.88,False UCAC4 612-040493,7.62245418,32.3414566,12.32,11.93,11.72,0.0,0,,7.64897224,32.2854176,5.23,4.99,0,1,1 4648,Tirion,17.15,10.927,1.5555,0,0,3.929,-4.41,,0.8,0 0,357.5711,2024,10,21,123.5562,319.5052,9.8045,0.18685,2.39438,1.94699,13.43,5.0,0.15 1.516,0.0190,0.0010,110,0.0050,Known errors,1.09,0,-1,-1 20241021_040493,60140.65 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:35 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org