IOTA/IOTA-ES occultation update for (1597) Laugier / UCAC4 489-027131 event on 2024 Dec 24, 16:37 UT Visible from Summary ------- On 2024 Dec 24 UT, the 13.2580192122364 km diameter asteroid (1597) Laugier will occult a 11.0 mag star in the constellation Monoceros for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.08 mag to 16.06 mag (the magnitude of the asteroid) for at most 1.020 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: 96 * date and approx. time of event: 2024 Dec 24, 16:31 - 2024 Dec 24, 16:44 * geocentric midpoint of event [JD]: 2460669.19283175 * magnitude of target star: 10.99 * magnitude drop [mag]: 5.08 * estimated maximum duration [s]: 1.020 * Moon: 34 % sunlit, 101° distance * Sun: 163° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 17 * 1 sigma uncertainty interval [path widths]: +/- 0.41 * 1 sigma uncertainty interval [seconds]: +/- 1.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.017, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.017", 0.003", 88°) * approx speed of asteroid's shadow [km/s]: 13.1579 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 489-027131 by 1597 Laugier on 2024 Dec 24 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 30 0 0 -31 57 4 16 43 53.0 0 81 3 -31 52 16 -32 1 52 -31 48 18 -32 5 51 .... 31 0 0 -31 49 3 16 43 52.9 1 80 3 -31 44 15 -31 53 51 -31 40 17 -31 57 50 0.48 32 0 0 -31 41 12 16 43 52.6 2 80 2 -31 36 25 -31 46 0 -31 32 27 -31 49 59 0.63 33 0 0 -31 33 32 16 43 52.2 3 79 1 -31 28 45 -31 38 20 -31 24 47 -31 42 18 0.69 34 0 0 -31 26 2 16 43 51.7 4 79 0 -31 21 15 -31 30 50 -31 17 17 -31 34 48 0.72 35 0 0 -31 18 43 16 43 51.0 5 78 -1 -31 13 56 -31 23 30 -31 9 58 -31 27 28 0.75 36 0 0 -31 11 34 16 43 50.1 6 78 -1 -31 6 47 -31 16 21 -31 2 50 -31 20 20 0.76 37 0 0 -31 4 37 16 43 49.2 6 77 -2 -30 59 50 -31 9 24 -30 55 53 -31 13 22 0.77 38 0 0 -30 57 50 16 43 48.0 7 77 -3 -30 53 3 -31 2 37 -30 49 6 -31 6 35 0.78 39 0 0 -30 51 14 16 43 46.8 8 76 -4 -30 46 28 -30 56 1 -30 42 31 -30 59 59 0.78 40 0 0 -30 44 50 16 43 45.4 9 76 -5 -30 40 4 -30 49 37 -30 36 7 -30 53 34 0.79 41 0 0 -30 38 37 16 43 43.8 10 75 -5 -30 33 51 -30 43 24 -30 29 54 -30 47 21 0.79 42 0 0 -30 32 36 16 43 42.2 11 74 -6 -30 27 50 -30 37 22 -30 23 53 -30 41 20 0.80 43 0 0 -30 26 46 16 43 40.3 11 74 -7 -30 22 0 -30 31 32 -30 18 4 -30 35 30 0.80 44 0 0 -30 21 8 16 43 38.4 12 73 -8 -30 16 22 -30 25 54 -30 12 26 -30 29 51 0.80 45 0 0 -30 15 42 16 43 36.3 13 73 -9 -30 10 56 -30 20 28 -30 7 0 -30 24 25 0.81 46 0 0 -30 10 28 16 43 34.1 14 72 -9 -30 5 42 -30 15 13 -30 1 46 -30 19 10 0.81 47 0 0 -30 5 25 16 43 31.7 15 72 -10 -30 0 40 -30 10 11 -29 56 44 -30 14 8 0.81 48 0 0 -30 0 35 16 43 29.2 16 71 -11 -29 55 50 -30 5 21 -29 51 54 -30 9 18 0.81 49 0 0 -29 55 57 16 43 26.6 17 71 -12 -29 51 12 -30 0 43 -29 47 16 -30 4 39 0.81 50 0 0 -29 51 32 16 43 23.8 17 70 -12 -29 46 47 -29 56 17 -29 42 51 -30 0 14 0.81 51 0 0 -29 47 18 16 43 20.9 18 70 -13 -29 42 34 -29 52 4 -29 38 38 -29 56 0 0.81 52 0 0 -29 43 17 16 43 17.9 19 69 -14 -29 38 33 -29 48 2 -29 34 37 -29 51 59 0.81 53 0 0 -29 39 29 16 43 14.7 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15 -46 50 28 -47 0 7 -46 46 28 -47 4 8 1.31 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.8 Data for the target star ------------------------ * name: UCAC4 489-027131 * constellation : Monoceros * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 06 36 26.6116 DE: +07 42 06.584 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 06 36 26.6116 DE: +07 42 06.584 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.0 * B mag [mag]: 11.8 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1597) Laugier asteroid class: approx. diameter [km]: 13 approx. diameter ["]: 0.009 distance from Earth [AU]: 1.98520 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#50 date of fit: 2023 Feb 11 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): 0.017", 0.003", 87.915° remarks: * orbital elements for (1597)Laugier : Mean anomaly = 252.9904024060 deg Arg. of pericenter = 54.6022594430 deg Long. of node = 158.3200938558 deg Inclination = 11.7890410294 deg Eccentricity = 0.0870969984 Semimajor axis = 2.8494359299 AU Perihelion dist = 2.6012586132 AU Mag: H = 11.78, G = 0.15 Epoch of elements : MJD 60668.69283383 TDT (2024 Dec 24.6928) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#502023Feb11,1.02,2024,12,24,16.627962,-0.084326,-0.633187,-7.361647,0.980527,-0.000584,0.001632,0.000002,0.000000 116.3386,7.6815,-69.44,-23.40,False UCAC4 489-027131,6.60739210,7.7018289,11.76,10.99,10.57,0.1,0,,6.63034525,7.6815487,5.08,5.04,0,0,0 1597,Laugier,16.06,13.402,1.9852,0,0,-2.194,4.34,,1.2,0 0,252.8484,2024,12,24,54.6023,158.3201,11.7890,0.08710,2.84944,2.60126,11.78,5.0,0.15 1.414,0.0170,0.0026,88,0.0038,Known errors,1.03,0,-1,-1 20241224_027131,60140.75 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 18:04 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org