IOTA/IOTA-ES occultation update for (1378) Leonce / TYC 4972-00253-1 event on 2024 Jan 22, 17:23 UT Visible from Summary ------- On 2024 Jan 22 UT, the 20.3544784931485 km diameter asteroid (1378) Leonce will occult a 9.3 mag star in the constellation Virgo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 7.24 mag to 16.50 mag (the magnitude of the asteroid) for at most 1.330 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 22, 17:16 - 2024 Jan 22, 17:29 * geocentric midpoint of event [JD]: 2460332.22439575 * magnitude of target star: 9.26 * magnitude drop [mag]: 7.24 * estimated maximum duration [s]: 1.330 * Moon: 91 % sunlit, 115° distance * Sun: 98° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 22 * 1 sigma uncertainty interval [path widths]: +/- 0.18 * 1 sigma uncertainty interval [seconds]: +/- 1.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.018, +/- 0.009) * 1 sigma uncertainty ellipse (major, minor, PA): (0.020", 0.002", 115°) * approx speed of asteroid's shadow [km/s]: 15.3960 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4972-00253-1 by 1378 Leonce on 2024 Jan 22 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 92 0 0 - 3 26 53 17 16 49.6 0 96 -64 - 3 33 1 .. .. .. - 3 35 11 .. .. .. .... 93 0 0 - 3 33 46 17 16 49.7 1 96 -65 - 3 39 54 - 3 27 38 - 3 42 5 - 3 25 28 0.27 94 0 0 - 3 41 4 17 16 49.9 2 96 -65 - 3 47 12 - 3 34 55 - 3 49 23 - 3 32 45 0.36 95 0 0 - 3 48 46 17 16 50.3 3 96 -65 - 3 54 55 - 3 42 37 - 3 57 6 - 3 40 27 0.39 96 0 0 - 3 56 53 17 16 50.7 4 96 -65 - 4 3 3 - 3 50 44 - 4 5 14 - 3 48 34 0.41 97 0 0 - 4 5 26 17 16 51.4 5 96 -65 - 4 11 35 - 3 59 16 - 4 13 46 - 3 57 5 0.42 98 0 0 - 4 14 22 17 16 52.2 6 96 -65 - 4 20 32 - 4 8 13 - 4 22 44 - 4 6 2 0.42 99 0 0 - 4 23 44 17 16 53.1 7 96 -66 - 4 29 54 - 4 17 34 - 4 32 6 - 4 15 23 0.43 100 0 0 - 4 33 30 17 16 54.1 8 96 -66 - 4 39 41 - 4 27 19 - 4 41 52 - 4 25 8 0.43 101 0 0 - 4 43 40 17 16 55.3 9 96 -65 - 4 49 52 - 4 37 29 - 4 52 3 - 4 35 18 0.43 102 0 0 - 4 54 15 17 16 56.7 10 96 -65 - 5 0 27 - 4 48 3 - 5 2 39 - 4 45 52 0.43 103 0 0 - 5 5 14 17 16 58.2 11 95 -65 - 5 11 26 - 4 59 2 - 5 13 38 - 4 56 50 0.44 104 0 0 - 5 16 37 17 16 59.8 12 95 -65 - 5 22 50 - 5 10 25 - 5 25 2 - 5 8 13 0.44 105 0 0 - 5 28 24 17 17 1.6 13 95 -65 - 5 34 38 - 5 22 11 - 5 36 50 - 5 19 59 0.44 106 0 0 - 5 40 35 17 17 3.5 14 95 -65 - 5 46 49 - 5 34 22 - 5 49 2 - 5 32 10 0.44 107 0 0 - 5 53 10 17 17 5.5 15 95 -64 - 5 59 24 - 5 46 56 - 6 1 37 - 5 44 44 0.44 108 0 0 - 6 6 9 17 17 7.7 16 95 -64 - 6 12 23 - 5 59 54 - 6 14 36 - 5 57 42 0.44 109 0 0 - 6 19 30 17 17 10.1 17 95 -63 - 6 25 46 - 6 13 15 - 6 27 59 - 6 11 3 0.44 110 0 0 - 6 33 16 17 17 12.5 18 95 -63 - 6 39 32 - 6 27 0 - 6 41 45 - 6 24 47 0.44 111 0 0 - 6 47 24 17 17 15.2 19 94 -63 - 6 53 41 - 6 41 8 - 6 55 54 - 6 38 55 0.44 112 0 0 - 7 1 55 17 17 17.9 20 94 -62 - 7 8 12 - 6 55 38 - 7 10 26 - 6 53 25 0.45 113 0 0 - 7 16 49 17 17 20.8 21 94 -62 - 7 23 7 - 7 10 32 - 7 25 21 - 7 8 18 0.45 114 0 0 - 7 32 5 17 17 23.9 22 94 -61 - 7 38 24 - 7 25 48 - 7 40 38 - 7 23 34 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0.46 -100 0 0 -45 32 18 17 29 17.6 11 272 59 -45 38 23 -45 26 14 -45 40 32 -45 24 5 0.46 - 99 0 0 -45 30 4 17 29 18.6 10 271 60 -45 36 8 -45 23 59 -45 38 18 -45 21 50 0.46 - 98 0 0 -45 27 31 17 29 19.6 10 271 60 -45 33 36 -45 21 27 -45 35 45 -45 19 18 0.47 - 97 0 0 -45 24 41 17 29 20.5 9 270 60 -45 30 46 -45 18 36 -45 32 55 -45 16 27 0.47 - 96 0 0 -45 21 33 17 29 21.3 8 269 61 -45 27 38 -45 15 28 -45 29 47 -45 13 18 0.47 - 95 0 0 -45 18 7 17 29 22.1 7 269 61 -45 24 12 -45 12 1 -45 26 22 -45 9 52 0.47 - 94 0 0 -45 14 23 17 29 22.7 7 268 62 -45 20 29 -45 8 17 -45 22 38 -45 6 8 0.48 - 93 0 0 -45 10 21 17 29 23.4 6 267 62 -45 16 27 -45 4 15 -45 18 37 -45 2 6 0.48 - 92 0 0 -45 6 2 17 29 23.9 5 266 63 -45 12 8 -44 59 56 -45 14 18 -44 57 46 0.49 - 91 0 0 -45 1 24 17 29 24.4 5 266 63 -45 7 31 -44 55 18 -45 9 41 -44 53 8 0.49 - 90 0 0 -44 56 29 17 29 24.8 4 265 63 -45 2 36 -44 50 22 -45 4 46 -44 48 13 0.50 - 89 0 0 -44 51 16 17 29 25.2 3 264 64 -44 57 23 -44 45 9 -44 59 33 -44 42 59 0.51 - 88 0 0 -44 45 45 17 29 25.5 2 264 64 -44 51 52 -44 39 38 -44 54 3 -44 37 28 0.54 - 87 0 0 -44 39 56 17 29 25.7 2 263 64 -44 46 4 -44 33 48 -44 48 14 -44 31 38 0.57 - 86 0 0 -44 33 49 17 29 25.8 1 262 65 -44 39 57 -44 27 41 -44 42 8 -44 25 31 0.67 - 85 0 0 -44 27 24 17 29 25.9 0 261 65 -44 33 33 -44 21 16 -44 35 44 -44 19 6 1.24 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 12.0 Data for the target star ------------------------ * name: TYC 4972-00253-1 * constellation : Virgo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 13 31 18.3111 DE: -06 10 38.999 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 13 31 18.3114 DE: -06 10 39.001 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 9.3 * B mag [mag]: 9.5 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1378) Leonce asteroid class: approx. diameter [km]: 20 approx. diameter ["]: 0.015 distance from Earth [AU]: 1.82720 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 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): 0.020", 0.002", 114.59° remarks: * orbital elements for (1378)Leonce : Mean anomaly = 306.8306285533 deg Arg. of pericenter = 202.1335943223 deg Long. of node = 43.5057518808 deg Inclination = 3.5920765869 deg Eccentricity = 0.1510883745 Semimajor axis = 2.3741107390 AU Perihelion dist = 2.0154102066 AU Mag: H = 12.29, G = 0.15 Epoch of elements : MJD 60331.72439609 TDT (2024 Jan 22.7244) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#502023Apr24,1.33,2024,1,22,17.385498,-0.143296,-0.380363,8.137594,-3.048657,-0.005203,0.001996,0.000000,0.000000 -179.2070,-6.3018,-77.90,-19.67,False TYC 4972-00253-1,13.52175304,-6.1774995,9.51,9.26,9.13,0.1,0,,13.54263590,-6.3018416,7.24,6.93,0,0,0 1378,Leonce,16.50,20.487,1.8272,0,0,2.627,-14.68,,1.2,0 0,306.6355,2024,1,22,202.1336,43.5058,3.5921,0.15109,2.37411,2.01541,12.29,5.0,0.15 1.177,0.0200,0.0023,115,0.0027,Known errors,1.21,0,-1,-1 20240122_0253-1,60137.03 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 12, 00:37 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org