IOTA/IOTA-ES occultation update for (11683) 1998 FO11 / TYC 5620-00847-1 event on 2024 Jan 20, 06:20 UT Visible from Summary ------- On 2024 Jan 20 UT, the 12.9284257080789 km diameter asteroid (11683) 1998 FO11 will occult a 8.1 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 10.66 mag to 18.77 mag (the magnitude of the asteroid) for at most 0.380 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 Jan 20, 06:18 - 2024 Jan 20, 06:23 * geocentric midpoint of event [JD]: 2460329.76448667 * magnitude of target star: 8.11 * magnitude drop [mag]: 10.66 * estimated maximum duration [s]: 0.380 * Moon: 72 % sunlit, 167° distance * Sun: 57° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 15 * 1 sigma uncertainty interval [path widths]: +/- 0.22 * 1 sigma uncertainty interval [seconds]: +/- 0.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.012", 0.001", 96°) * approx speed of asteroid's shadow [km/s]: 35.0288 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5620-00847-1 by 11683 1998 FO11 on 2024 Jan 20 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 - 67 0 0 -24 50 56 6 18 9.6 0 104 -39 -24 55 3 -24 46 49 -24 56 54 -24 44 58 .... - 66 0 0 -25 4 59 6 18 9.7 1 104 -38 -25 9 7 -25 0 52 -25 10 58 -24 59 1 0.41 - 65 0 0 -25 19 4 6 18 9.8 2 103 -38 -25 23 12 -25 14 57 -25 25 3 -25 13 6 0.45 - 64 0 0 -25 33 10 6 18 10.0 3 103 -37 -25 37 18 -25 29 3 -25 39 9 -25 27 12 0.47 - 63 0 0 -25 47 17 6 18 10.2 4 102 -36 -25 51 25 -25 43 10 -25 53 16 -25 41 19 0.47 - 62 0 0 -26 1 25 6 18 10.5 5 102 -36 -26 5 32 -25 57 17 -26 7 23 -25 55 26 0.48 - 61 0 0 -26 15 33 6 18 10.8 6 102 -35 -26 19 40 -26 11 25 -26 21 31 -26 9 34 0.48 - 60 0 0 -26 29 41 6 18 11.2 7 101 -34 -26 33 48 -26 25 33 -26 35 39 -26 23 42 0.49 - 59 0 0 -26 43 48 6 18 11.6 8 101 -33 -26 47 56 -26 39 41 -26 49 47 -26 37 50 0.49 - 58 0 0 -26 57 56 6 18 12.1 9 100 -33 -27 2 3 -26 53 48 -27 3 54 -26 51 57 0.49 - 57 0 0 -27 12 2 6 18 12.6 10 100 -32 -27 16 10 -27 7 54 -27 18 1 -27 6 4 0.49 - 56 0 0 -27 26 7 6 18 13.2 11 99 -31 -27 30 15 -27 22 0 -27 32 6 -27 20 9 0.49 - 55 0 0 -27 40 11 6 18 13.9 12 99 -30 -27 44 19 -27 36 3 -27 46 10 -27 34 13 0.49 - 54 0 0 -27 54 13 6 18 14.5 13 98 -30 -27 58 21 -27 50 6 -28 0 12 -27 48 15 0.50 - 53 0 0 -28 8 13 6 18 15.3 13 98 -29 -28 12 21 -28 4 6 -28 14 12 -28 2 15 0.50 - 52 0 0 -28 22 11 6 18 16.1 14 97 -28 -28 26 18 -28 18 3 -28 28 9 -28 16 12 0.50 - 51 0 0 -28 36 6 6 18 16.9 15 97 -27 -28 40 13 -28 31 58 -28 42 5 -28 30 8 0.50 - 50 0 0 -28 49 58 6 18 17.8 16 96 -27 -28 54 6 -28 45 51 -28 55 57 -28 44 0 0.50 - 49 0 0 -29 3 47 6 18 18.7 17 96 -26 -29 7 55 -28 59 40 -29 9 46 -28 57 49 0.50 - 48 0 0 -29 17 33 6 18 19.7 18 95 -25 -29 21 41 -29 13 26 -29 23 32 -29 11 35 0.50 - 47 0 0 -29 31 15 6 18 20.7 19 95 -24 -29 35 23 -29 27 8 -29 37 14 -29 25 17 0.50 - 46 0 0 -29 44 53 6 18 21.7 20 94 -23 -29 49 1 -29 40 46 -29 50 52 -29 38 55 0.50 - 45 0 0 -29 58 27 6 18 22.9 21 94 -23 -30 2 35 -29 54 20 -30 4 26 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12 6 23 25.8 17 265 70 -31 48 18 -31 40 5 -31 50 9 -31 38 15 0.52 106 0 0 -31 31 22 6 23 26.7 16 264 69 -31 35 29 -31 27 16 -31 37 20 -31 25 25 0.52 107 0 0 -31 18 27 6 23 27.5 15 264 69 -31 22 34 -31 14 20 -31 24 25 -31 12 30 0.53 108 0 0 -31 5 26 6 23 28.3 14 263 68 -31 9 33 -31 1 19 -31 11 23 -30 59 28 0.53 109 0 0 -30 52 19 6 23 29.1 14 263 67 -30 56 26 -30 48 12 -30 58 16 -30 46 21 0.53 110 0 0 -30 39 6 6 23 29.8 13 262 67 -30 43 13 -30 34 59 -30 45 4 -30 33 8 0.53 111 0 0 -30 25 48 6 23 30.5 12 262 66 -30 29 56 -30 21 41 -30 31 47 -30 19 51 0.53 112 0 0 -30 12 26 6 23 31.1 11 261 65 -30 16 33 -30 8 19 -30 18 24 -30 6 28 0.54 113 0 0 -29 58 58 6 23 31.7 10 261 64 -30 3 6 -29 54 51 -30 4 57 -29 53 1 0.54 114 0 0 -29 45 27 6 23 32.3 9 260 64 -29 49 34 -29 41 19 -29 51 25 -29 39 29 0.54 115 0 0 -29 31 51 6 23 32.7 8 260 63 -29 35 58 -29 27 43 -29 37 49 -29 25 53 0.55 116 0 0 -29 18 11 6 23 33.2 7 259 62 -29 22 18 -29 14 3 -29 24 9 -29 12 13 0.55 117 0 0 -29 4 27 6 23 33.6 6 259 61 -29 8 35 -29 0 20 -29 10 26 -28 58 29 0.56 118 0 0 -28 50 40 6 23 33.9 5 258 60 -28 54 48 -28 46 33 -28 56 39 -28 44 42 0.57 119 0 0 -28 36 50 6 23 34.2 5 258 60 -28 40 58 -28 32 43 -28 42 49 -28 30 52 0.58 120 0 0 -28 22 57 6 23 34.4 4 257 59 -28 27 5 -28 18 50 -28 28 56 -28 16 59 0.60 121 0 0 -28 9 2 6 23 34.6 3 257 58 -28 13 9 -28 4 54 -28 15 0 -28 3 3 0.63 122 0 0 -27 55 4 6 23 34.7 2 256 57 -27 59 12 -27 50 56 -28 1 3 -27 49 5 0.69 123 0 0 -27 41 4 6 23 34.8 1 256 56 -27 45 12 -27 36 57 -27 47 3 -27 35 6 0.86 124 0 0 -27 27 3 6 23 34.8 0 255 55 -27 31 10 -27 22 55 -27 33 1 .. .. .. 14.86 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 12.0 Data for the target star ------------------------ * name: TYC 5620-00847-1 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 07 32.5537 DE: -12 56 47.071 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 07 32.5546 DE: -12 56 47.075 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 8.1 * B mag [mag]: 8.4 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (11683) 1998 FO11 asteroid class: approx. diameter [km]: 13 approx. diameter ["]: 0.006 distance from Earth [AU]: 2.88960 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#44 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): 0.012", 0.001", 95.533° remarks: * orbital elements for (11683)1998 FO11 : Mean anomaly = 23.1188111362 deg Arg. of pericenter = 18.9984159552 deg Long. of node = 179.0540979511 deg Inclination = 12.9872306016 deg Eccentricity = 0.0509023367 Semimajor axis = 2.6208229081 AU Perihelion dist = 2.4874168979 AU Mag: H = 13.50, G = 0.15 Epoch of elements : MJD 60329.26448671 TDT (2024 Jan 20.2645) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#442023Apr25,0.38,2024,1,20,6.347680,-0.014267,-0.448359,19.765369,-0.481909,-0.004736,0.001339,-0.000001,0.000000 27.8616,-13.0110,87.49,-20.22,False TYC 5620-00847-1,16.12570933,-12.9464085,8.37,8.11,7.97,0.1,0,,16.14774567,-13.0109994,10.66,10.35,0,0,0 11683,1998 FO11,18.77,13.138,2.8896,0,0,4.117,-1.46,,1.0,0 0,23.0574,2024,1,20,18.9984,179.0541,12.9872,0.05090,2.62082,2.48742,13.50,5.0,0.15 1.224,0.0117,0.0011,96,0.0014,Known errors,1.11,0,-1,-1 20240120_0847-1,60137.02 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 12, 00:32 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org