IOTA/IOTA-ES occultation update for (15777) 1993 LF / TYC 1879-01843-1 event on 2024 Apr 07, 06:32 UT Visible from Summary ------- On 2024 Apr 07 UT, the 9.64023250663144 km diameter asteroid (15777) 1993 LF will occult a 10.3 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 7.97 mag to 18.23 mag (the magnitude of the asteroid) for at most 0.470 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: 94 * date and approx. time of event: 2024 Apr 07, 06:27 - 2024 Apr 07, 06:36 * geocentric midpoint of event [JD]: 2460407.77245921 * magnitude of target star: 10.26 * magnitude drop [mag]: 7.97 * estimated maximum duration [s]: 0.470 * Moon: 3 % sunlit, 99° distance * Sun: 79° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 11 * 1 sigma uncertainty interval [path widths]: +/- 0.45 * 1 sigma uncertainty interval [seconds]: +/- 0.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.009, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.009", 0.002", 77°) * approx speed of asteroid's shadow [km/s]: 21.1015 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1879-01843-1 by 15777 1993 LF on 2024 Apr 7 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 66 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 18 56 22 .... 67 0 0 19 15 18 6 28 0.5 1 66 70 19 11 53 19 18 44 19 8 47 19 21 51 .... 68 0 0 19 41 3 6 28 0.6 2 67 70 19 37 38 19 44 29 19 34 31 19 47 37 -0.53 69 0 0 20 7 5 6 28 0.9 3 67 71 20 3 39 20 10 31 20 0 31 20 13 39 -0.55 70 0 0 20 33 22 6 28 1.3 4 67 71 20 29 56 20 36 49 20 26 48 20 39 57 -0.57 71 0 0 20 59 55 6 28 1.8 5 68 72 20 56 28 21 3 22 20 53 20 21 6 31 -0.57 72 0 0 21 26 42 6 28 2.5 6 68 72 21 23 15 21 30 9 21 20 6 21 33 19 -0.58 73 0 0 21 53 43 6 28 3.2 7 69 72 21 50 15 21 57 11 21 47 6 22 0 20 -0.58 74 0 0 22 20 57 6 28 4.1 8 69 72 22 17 28 22 24 25 22 14 19 22 27 35 -0.59 75 0 0 22 48 23 6 28 5.0 9 69 72 22 44 54 22 51 51 22 41 44 22 55 2 -0.59 76 0 0 23 16 0 6 28 6.1 10 70 72 23 12 31 23 19 29 23 9 21 23 22 40 -0.59 77 0 0 23 43 49 6 28 7.3 11 70 72 23 40 19 23 47 18 23 37 8 23 50 29 -0.59 78 0 0 24 11 47 6 28 8.6 12 71 72 24 8 17 24 15 17 24 5 6 24 18 28 -0.59 79 0 0 24 39 54 6 28 10.0 13 71 72 24 36 24 24 43 24 24 33 12 24 46 36 -0.59 80 0 0 25 8 10 6 28 11.5 14 72 72 25 4 39 25 11 40 25 1 27 25 14 53 -0.59 81 0 0 25 36 33 6 28 13.2 15 72 71 25 33 2 25 40 4 25 29 50 25 43 16 -0.59 82 0 0 26 5 2 6 28 14.9 16 72 71 26 1 31 26 8 34 25 58 18 26 11 46 -0.59 83 0 0 26 33 37 6 28 16.7 17 73 71 26 30 6 26 37 9 26 26 53 26 40 22 -0.60 84 0 0 27 2 17 6 28 18.6 18 73 70 26 58 46 27 5 49 26 55 33 27 9 3 -0.60 85 0 0 27 31 1 6 28 20.7 19 74 70 27 27 29 27 34 33 27 24 16 27 37 47 -0.60 86 0 0 27 59 48 6 28 22.8 20 75 69 27 56 15 28 3 20 27 53 2 28 6 34 -0.60 87 0 0 28 28 37 6 28 25.0 21 75 68 28 25 4 28 32 10 28 21 51 28 35 24 -0.60 88 0 0 28 57 28 6 28 27.3 22 76 68 28 53 55 29 1 1 28 50 41 29 4 15 -0.60 89 0 0 29 26 19 6 28 29.7 23 76 67 29 22 46 29 29 52 29 19 31 29 33 6 -0.60 90 0 0 29 55 9 6 28 32.2 24 77 66 29 51 36 29 58 43 29 48 22 30 1 57 -0.60 91 0 0 30 23 59 6 28 34.7 25 78 66 30 20 25 30 27 32 30 17 11 30 30 47 -0.60 92 0 0 30 52 46 6 28 37.4 26 78 65 30 49 12 30 56 19 30 45 57 30 59 34 -0.60 93 0 0 31 21 30 6 28 40.1 27 79 64 31 17 56 31 25 4 31 14 41 31 28 19 -0.60 94 0 0 31 50 10 6 28 42.9 28 80 63 31 46 36 31 53 44 31 43 21 31 56 59 -0.60 95 0 0 32 18 45 6 28 45.8 29 80 63 32 15 11 32 22 19 32 11 56 32 25 35 -0.60 96 0 0 32 47 15 6 28 48.8 30 81 62 32 43 41 32 50 49 32 40 26 32 54 4 -0.60 97 0 0 33 15 38 6 28 51.8 31 82 61 33 12 4 33 19 12 33 8 49 33 22 28 -0.60 98 0 0 33 43 54 6 28 54.9 32 82 60 33 40 20 33 47 28 33 37 5 33 50 44 -0.60 99 0 0 34 12 2 6 28 58.0 33 83 59 34 8 28 34 15 36 34 5 13 34 18 51 -0.60 100 0 0 34 40 1 6 29 1.2 33 84 58 34 36 27 34 43 35 34 33 12 34 46 50 -0.60 101 0 0 35 7 50 6 29 4.5 34 85 58 35 4 16 35 11 24 35 1 1 35 14 40 -0.60 102 0 0 35 35 29 6 29 7.8 35 86 57 35 31 55 35 39 3 35 28 40 35 42 19 -0.60 103 0 0 36 2 57 6 29 11.2 36 87 56 35 59 23 36 6 31 35 56 8 36 9 46 -0.60 104 0 0 36 30 13 6 29 14.6 37 88 55 36 26 39 36 33 47 36 23 25 36 37 2 -0.60 105 0 0 36 57 17 6 29 18.1 38 88 54 36 53 43 37 0 50 36 50 28 37 4 5 -0.60 106 0 0 37 24 7 6 29 21.6 39 89 53 37 20 34 37 27 41 37 17 19 37 30 56 -0.60 107 0 0 37 50 44 6 29 25.1 39 90 52 37 47 10 37 54 17 37 43 56 37 57 32 -0.60 108 0 0 38 17 6 6 29 28.7 40 91 52 38 13 32 38 20 39 38 10 18 38 23 53 -0.60 109 0 0 38 43 13 6 29 32.3 41 92 51 38 39 40 38 46 46 38 36 26 38 50 0 -0.60 110 0 0 39 9 4 6 29 36.0 42 93 50 39 5 31 39 12 37 39 2 18 39 15 51 -0.60 111 0 0 39 34 39 6 29 39.7 42 95 49 39 31 7 39 38 12 39 27 53 39 41 26 -0.60 112 0 0 39 59 58 6 29 43.4 43 96 48 39 56 25 40 3 30 39 53 12 40 6 44 -0.60 113 0 0 40 24 59 6 29 47.1 44 97 47 40 21 27 40 28 31 40 18 14 40 31 44 -0.60 114 0 0 40 49 43 6 29 50.9 45 98 46 40 46 11 40 53 14 40 42 59 40 56 28 -0.60 115 0 0 41 14 9 6 29 54.6 45 99 46 41 10 37 41 17 40 41 7 25 41 20 53 -0.60 116 0 0 41 38 16 6 29 58.4 46 100 45 41 34 45 41 41 47 41 31 33 41 44 59 -0.60 117 0 0 42 2 4 6 30 2.2 47 102 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28 -0.64 -102 0 0 42 27 55 6 36 34.0 11 291 -41 42 24 25 42 31 25 42 21 14 42 34 37 -0.64 -101 0 0 42 4 45 6 36 34.9 10 291 -41 42 1 14 42 8 15 41 58 3 42 11 27 -0.64 -100 0 0 41 41 16 6 36 35.8 9 292 -41 41 37 45 41 44 47 41 34 33 41 47 59 -0.65 - 99 0 0 41 17 29 6 36 36.6 8 293 -42 41 13 58 41 21 0 41 10 46 41 24 12 -0.65 - 98 0 0 40 53 24 6 36 37.3 7 293 -42 40 49 53 40 56 56 40 46 40 41 0 8 -0.66 - 97 0 0 40 29 2 6 36 37.9 6 294 -43 40 25 31 40 32 34 40 22 18 40 35 47 -0.67 - 96 0 0 40 4 23 6 36 38.5 6 295 -43 40 0 51 40 7 55 39 57 38 40 11 8 -0.68 - 95 0 0 39 39 28 6 36 39.0 5 295 -43 39 35 56 39 43 0 39 32 43 39 46 14 -0.70 - 94 0 0 39 14 16 6 36 39.4 4 296 -44 39 10 44 39 17 49 39 7 31 39 21 3 -0.72 - 93 0 0 38 48 50 6 36 39.7 3 297 -44 38 45 17 38 52 22 38 42 3 38 55 36 -0.75 - 92 0 0 38 23 8 6 36 40.0 2 297 -44 38 19 35 38 26 40 38 16 21 38 29 55 -0.82 - 91 0 0 37 57 11 6 36 40.2 1 298 -45 37 53 38 38 0 44 37 50 25 38 3 59 -0.98 - 90 0 0 37 31 1 6 36 40.2 0 299 -45 37 27 28 37 34 34 37 24 14 37 37 49 -2.18 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 14.3 Data for the target star ------------------------ * name: TYC 1879-01843-1 * constellation : Gemini * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 06 27 10.6866 DE: +22 33 35.563 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 06 27 10.6865 DE: +22 33 35.563 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.3 * B mag [mag]: 10.8 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (15777) 1993 LF asteroid class: approx. diameter [km]: 10 approx. diameter ["]: 0.005 distance from Earth [AU]: 2.85090 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#53 date of fit: 2023 Apr 27 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): 0.009", 0.002", 76.9° remarks: * orbital elements for (15777)1993 LF : Mean anomaly = 172.5168626042 deg Arg. of pericenter = 183.3041091646 deg Long. of node = 119.2135182988 deg Inclination = 15.5615950533 deg Eccentricity = 0.1094410640 Semimajor axis = 2.5525723345 AU Perihelion dist = 2.2732161021 AU Mag: H = 12.69, G = 0.15 Epoch of elements : MJD 60407.27245896 TDT (2024 Apr 07.2725) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#532023Apr27,0.47,2024,4,7,6.539021,-0.090597,0.500713,11.720095,2.119864,0.005664,-0.000294,0.000000,0.000000 163.0456,22.5461,82.43,7.04,False TYC 1879-01843-1,6.45296853,22.5598785,10.83,10.26,9.95,0.1,0,,6.47723876,22.5460991,7.97,7.83,0,0,0 15777,1993 LF,18.23,9.847,2.8509,0,0,2.610,6.54,,1.0,0 0,172.4510,2024,4,7,183.3041,119.2135,15.5616,0.10944,2.55257,2.27322,12.69,5.0,0.15 1.456,0.0090,0.0021,77,0.0022,Known errors,1.11,0,-1,-1 20240407_1843-1,60139.28 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 06:41 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org