IOTA/IOTA-ES occultation update for (18958) 2000 QL128 / TYC 7449-01094-1 event on 2024 Nov 03, 18:25 UT Visible from Summary ------- On 2024 Nov 03 UT, the 14.6014048238531 km diameter asteroid (18958) 2000 QL128 will occult a 9.5 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 8.44 mag to 17.95 mag (the magnitude of the asteroid) for at most 0.560 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: 56 * date and approx. time of event: 2024 Nov 03, 18:21 - 2024 Nov 03, 18:28 * geocentric midpoint of event [JD]: 2460618.26745409 * magnitude of target star: 9.51 * magnitude drop [mag]: 8.44 * estimated maximum duration [s]: 0.560 * Moon: 4 % sunlit, 51° distance * Sun: 76° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 16 * 1 sigma uncertainty interval [path widths]: +/- 1.12 * 1 sigma uncertainty interval [seconds]: +/- 2.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.026, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.026", 0.001", 83°) * approx speed of asteroid's shadow [km/s]: 26.3264 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7449-01094-1 by 18958 2000 QL128 on 2024 Nov 3 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 -107 0 0 - 1 41 46 18 21 24.6 1 124 74 - 1 47 0 - 1 36 32 - 1 58 42 - 1 24 48 .... -106 0 0 - 2 22 2 18 21 24.7 2 124 75 - 2 27 14 - 2 16 50 - 2 38 51 - 2 5 10 -0.17 -105 0 0 - 3 1 28 18 21 25.0 3 124 76 - 3 6 38 - 2 56 18 - 3 18 12 - 2 44 43 -0.27 -104 0 0 - 3 40 5 18 21 25.3 4 124 77 - 3 45 13 - 3 34 56 - 3 56 42 - 3 23 25 -0.31 -103 0 0 - 4 17 51 18 21 25.8 5 124 78 - 4 22 57 - 4 12 44 - 4 34 22 - 4 1 17 -0.33 -102 0 0 - 4 54 47 18 21 26.3 7 124 79 - 4 59 51 - 4 49 42 - 5 11 12 - 4 38 19 -0.35 -101 0 0 - 5 30 51 18 21 27.0 8 124 80 - 5 35 54 - 5 25 49 - 5 47 11 - 5 14 30 -0.36 -100 0 0 - 6 6 5 18 21 27.8 9 124 81 - 6 11 6 - 6 1 4 - 6 22 19 - 5 49 49 -0.37 - 99 0 0 - 6 40 28 18 21 28.6 10 124 81 - 6 45 27 - 6 35 29 - 6 56 36 - 6 24 18 -0.37 - 98 0 0 - 7 14 0 18 21 29.6 11 124 82 - 7 18 57 - 7 9 2 - 7 30 2 - 6 57 55 -0.38 - 97 0 0 - 7 46 40 18 21 30.6 12 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73 0 0 -16 41 20 18 22 18.7 37 121 64 -16 45 47 -16 36 53 -16 55 44 -16 26 55 -0.41 - 72 0 0 -16 53 39 18 22 21.5 38 121 63 -16 58 5 -16 49 13 -17 8 0 -16 39 16 -0.41 - 71 0 0 -17 5 12 18 22 24.3 39 121 62 -17 9 38 -17 0 46 -17 19 31 -16 50 51 -0.41 - 70 0 0 -17 16 0 18 22 27.2 40 121 61 -17 20 25 -17 11 35 -17 30 17 -17 1 41 -0.41 - 69 0 0 -17 26 2 18 22 30.1 41 121 60 -17 30 26 -17 21 37 -17 40 17 -17 11 45 -0.41 - 68 0 0 -17 35 19 18 22 33.0 42 121 59 -17 39 43 -17 30 55 -17 49 33 -17 21 4 -0.41 - 67 0 0 -17 43 51 18 22 36.0 42 121 59 -17 48 15 -17 39 28 -17 58 4 -17 29 37 -0.41 - 66 0 0 -17 51 39 18 22 39.0 43 121 58 -17 56 2 -17 47 16 -18 5 50 -17 37 26 -0.41 - 65 0 0 -17 58 41 18 22 42.1 44 121 57 -18 3 4 -17 54 19 -18 12 51 -17 44 30 -0.41 - 64 0 0 -18 5 0 18 22 45.3 45 121 56 -18 9 22 -18 0 37 -18 19 8 -17 50 50 -0.42 - 63 0 0 -18 10 34 18 22 48.4 46 121 55 -18 14 55 -18 6 12 -18 24 41 -17 56 25 -0.42 - 62 0 0 -18 15 23 18 22 51.6 47 121 54 -18 19 45 -18 11 2 -18 29 30 -18 1 15 -0.42 - 61 0 0 -18 19 29 18 22 54.9 48 121 53 -18 23 50 -18 15 7 -18 33 35 -18 5 22 -0.42 - 60 0 0 -18 22 50 18 22 58.2 49 121 52 -18 27 12 -18 18 29 -18 36 56 -18 8 44 -0.42 - 59 0 0 -18 25 28 18 23 1.5 49 122 51 -18 29 49 -18 21 7 -18 39 33 -18 11 21 -0.42 - 58 0 0 -18 27 21 18 23 4.9 50 122 50 -18 31 42 -18 23 0 -18 41 26 -18 13 15 -0.42 - 57 0 0 -18 28 31 18 23 8.3 51 122 49 -18 32 52 -18 24 10 -18 42 35 -18 14 25 -0.42 - 56 0 0 -18 28 56 18 23 11.8 52 122 48 -18 33 17 -18 24 35 -18 43 0 -18 14 50 -0.42 - 55 0 0 -18 28 37 18 23 15.3 53 123 47 -18 32 58 -18 24 16 -18 42 42 -18 14 32 -0.42 - 54 0 0 -18 27 35 18 23 18.8 54 123 46 -18 31 56 -18 23 14 -18 41 39 -18 13 29 -0.42 - 53 0 0 -18 25 48 18 23 22.4 54 124 45 -18 30 9 -18 21 27 -18 39 53 -18 11 42 -0.42 - 52 0 0 -18 23 17 18 23 26.0 55 124 44 -18 27 39 -18 18 56 -18 37 23 -18 9 10 -0.42 - 51 0 0 -18 20 2 18 23 29.6 56 125 43 -18 24 24 -18 15 41 -18 34 9 -18 5 55 -0.42 - 50 0 0 -18 16 3 18 23 33.3 57 125 42 -18 20 25 -18 11 41 -18 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44 59 0 22 10 0 57 4 -0.41 - 1 0 0 1 24 15 18 27 8.3 51 203 -10 1 18 50 1 29 41 1 6 42 1 41 51 -0.41 0 0 0 2 9 43 18 27 12.8 50 203 -11 2 4 16 2 15 11 1 52 4 2 27 26 -0.41 1 0 0 2 55 59 18 27 17.3 49 204 -12 2 50 30 3 1 29 2 38 13 3 13 49 -0.41 2 0 0 3 43 2 18 27 21.6 48 205 -13 3 37 31 3 48 34 3 25 9 4 0 58 -0.41 3 0 0 4 30 51 18 27 26.0 46 206 -15 4 25 17 4 36 25 4 12 51 4 48 53 -0.41 4 0 0 5 19 23 18 27 30.2 45 206 -16 5 13 47 5 24 59 5 1 16 5 37 33 -0.41 5 0 0 6 8 38 18 27 34.4 44 207 -17 6 3 0 6 14 16 5 50 25 6 26 55 -0.41 6 0 0 6 58 34 18 27 38.5 43 208 -18 6 52 54 7 4 15 6 40 14 7 16 58 -0.41 7 0 0 7 49 10 18 27 42.6 42 208 -19 7 43 28 7 54 53 7 30 43 8 7 40 -0.41 8 0 0 8 40 24 18 27 46.5 41 209 -21 8 34 40 8 46 8 8 21 50 8 59 0 -0.41 9 0 0 9 32 13 18 27 50.4 39 209 -22 9 26 27 9 37 59 9 13 33 9 50 56 -0.41 10 0 0 10 24 36 18 27 54.2 38 210 -23 10 18 48 10 30 24 10 5 50 10 43 25 -0.41 11 0 0 11 17 31 18 27 57.9 37 210 -24 11 11 41 11 23 21 10 58 39 11 36 26 -0.41 12 0 0 12 10 55 18 28 1.5 35 211 -25 12 5 3 12 16 47 11 51 57 12 29 56 -0.41 13 0 0 13 4 46 18 28 5.0 34 211 -26 12 58 52 13 10 40 12 45 42 13 23 53 -0.41 14 0 0 13 59 1 18 28 8.4 33 212 -27 13 53 6 14 4 57 13 39 52 14 18 14 -0.41 15 0 0 14 53 39 18 28 11.6 32 212 -29 14 47 41 14 59 36 14 34 23 15 12 57 -0.41 16 0 0 15 48 35 18 28 14.8 30 213 -30 15 42 36 15 54 34 15 29 15 16 7 59 -0.41 17 0 0 16 43 48 18 28 17.8 29 213 -31 16 37 48 16 49 49 16 24 23 17 3 17 -0.41 18 0 0 17 39 15 18 28 20.7 28 214 -32 17 33 13 17 45 17 17 19 45 17 58 49 -0.41 19 0 0 18 34 52 18 28 23.5 26 214 -33 18 28 49 18 40 56 18 15 18 18 54 31 -0.41 20 0 0 19 30 38 18 28 26.1 25 215 -34 19 24 33 19 36 43 19 10 59 19 50 20 -0.41 21 0 0 20 26 28 18 28 28.7 24 215 -35 20 20 22 20 32 34 20 6 45 20 46 14 -0.41 22 0 0 21 22 20 18 28 31.0 23 215 -36 21 16 13 21 28 27 21 2 34 21 42 10 -0.41 23 0 0 22 18 11 18 28 33.3 21 216 -37 22 12 3 22 24 19 21 58 21 22 38 4 -0.41 24 0 0 23 13 58 18 28 35.4 20 216 -38 23 7 49 23 20 7 22 54 5 23 33 54 -0.41 25 0 0 24 9 37 18 28 37.4 19 217 -39 24 3 27 24 15 47 23 49 42 24 29 36 -0.41 26 0 0 25 5 6 18 28 39.2 17 217 -40 24 58 56 25 11 17 24 45 9 25 25 7 -0.41 27 0 0 26 0 22 18 28 40.9 16 218 -41 25 54 11 26 6 33 25 40 23 26 20 25 -0.41 28 0 0 26 55 22 18 28 42.5 15 218 -42 26 49 11 27 1 34 26 35 21 27 15 27 -0.41 29 0 0 27 50 3 18 28 43.9 14 219 -42 27 43 51 27 56 15 27 30 1 28 10 9 -0.41 30 0 0 28 44 22 18 28 45.2 12 219 -43 28 38 10 28 50 34 28 24 19 29 4 28 -0.41 31 0 0 29 38 16 18 28 46.3 11 220 -44 29 32 4 29 44 29 29 18 13 29 58 23 -0.41 32 0 0 30 31 44 18 28 47.3 10 220 -45 30 25 32 30 37 56 30 11 40 30 51 51 -0.41 33 0 0 31 24 41 18 28 48.2 9 221 -45 31 18 29 31 30 54 31 4 38 31 44 48 -0.41 34 0 0 32 17 7 18 28 49.0 7 221 -46 32 10 55 32 23 19 31 57 5 32 37 13 -0.41 35 0 0 33 8 58 18 28 49.6 6 222 -47 33 2 47 33 15 10 32 48 57 33 29 3 -0.41 36 0 0 34 0 13 18 28 50.1 5 222 -47 33 54 2 34 6 24 33 40 13 34 20 16 -0.42 37 0 0 34 50 49 18 28 50.5 4 223 -48 34 44 39 34 57 0 34 30 52 35 10 51 -0.42 38 0 0 35 40 45 18 28 50.8 3 224 -48 35 34 35 35 46 55 35 20 50 36 0 45 -0.42 39 0 0 36 29 59 18 28 51.0 1 224 -49 36 23 50 36 36 8 36 10 6 36 49 56 -0.43 40 0 0 37 18 29 18 28 51.1 0 225 -49 37 12 21 37 24 37 36 58 39 37 38 23 -0.48 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: TYC 7449-01094-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 07 32.0375 DE: -34 17 01.224 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 07 32.0374 DE: -34 17 01.224 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 9.5 * B mag [mag]: 10.1 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (18958) 2000 QL128 asteroid class: approx. diameter [km]: 15 approx. diameter ["]: 0.007 distance from Earth [AU]: 2.87610 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#50 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): 0.026", 0.001", 83.067° remarks: * orbital elements for (18958)2000 QL128 : Mean anomaly = 346.1613777715 deg Arg. of pericenter = 291.3328895049 deg Long. of node = 46.3092098636 deg Inclination = 14.1357304564 deg Eccentricity = 0.1838775738 Semimajor axis = 3.3980042034 AU Perihelion dist = 2.7731874345 AU Mag: H = 12.42, G = 0.15 Epoch of elements : MJD 60617.76745375 TDT (2024 Nov 03.7675) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#502023Apr25,0.56,2024,11,3,18.418898,-0.159826,0.352479,13.531744,6.139453,0.005623,0.000893,0.000000,0.000000 -17.5055,-34.2141,-100.39,-15.38,False TYC 7449-01094-1,20.12556602,-34.2836733,10.08,9.51,9.20,0.1,0,,20.15200091,-34.2141489,8.44,8.30,0,0,0 18958,2000 QL128,17.95,14.810,2.8761,0,0,3.336,18.78,,1.4,0 0,346.0406,2024,11,3,291.3329,46.3092,14.1357,0.18388,3.39800,2.77319,12.42,5.0,0.15 2.119,0.0260,0.0015,83,0.0079,Known errors,0.97,0,-1,-1 20241103_1094-1,60140.68 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:17 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org