IOTA/IOTA-ES occultation update for (1350) Rosselia / UCAC4 399-055916 event on 2024 Apr 04, 02:56 UT Visible from Summary ------- On 2024 Apr 04 UT, the 21.475 km diameter asteroid (1350) Rosselia will occult a 10.9 mag star in the constellation Libra for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.54 mag to 15.39 mag (the magnitude of the asteroid) for at most 1.940 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 Apr 04, 02:47 - 2024 Apr 04, 03:05 * geocentric midpoint of event [JD]: 2460404.62251058 * magnitude of target star: 10.87 * magnitude drop [mag]: 4.54 * estimated maximum duration [s]: 1.940 * Moon: 28 % sunlit, 94° distance * Sun: 156° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 24 * 1 sigma uncertainty interval [path widths]: +/- 0.30 * 1 sigma uncertainty interval [seconds]: +/- 2.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.016, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.003", 105°) * approx speed of asteroid's shadow [km/s]: 11.0805 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 399-055916 by 1350 Rosselia on 2024 Apr 4 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 -112 0 0 - 1 51 1 3 5 4.6 0 100 -24 - 1 44 29 - 1 57 34 - 1 40 34 - 2 1 30 .... -111 0 0 - 2 2 36 3 5 4.4 1 100 -25 - 1 56 3 - 2 9 9 - 1 52 8 - 2 13 5 0.35 -110 0 0 - 2 14 39 3 5 4.0 2 100 -26 - 2 8 5 - 2 21 13 - 2 4 10 - 2 25 9 0.40 -109 0 0 - 2 27 10 3 5 3.4 3 100 -27 - 2 20 36 - 2 33 45 - 2 16 40 - 2 37 41 0.42 -108 0 0 - 2 40 10 3 5 2.6 4 100 -28 - 2 33 36 - 2 46 45 - 2 29 39 - 2 50 42 0.43 -107 0 0 - 2 53 39 3 5 1.6 6 100 -29 - 2 47 3 - 3 0 14 - 2 43 7 - 3 4 11 0.44 -106 0 0 - 3 7 35 3 5 0.4 7 100 -30 - 3 0 59 - 3 14 11 - 2 57 2 - 3 18 8 0.44 -105 0 0 - 3 21 58 3 4 59.0 8 100 -31 - 3 15 22 - 3 28 35 - 3 11 25 - 3 32 33 0.45 -104 0 0 - 3 36 50 3 4 57.4 9 100 -32 - 3 30 13 - 3 43 27 - 3 26 15 - 3 47 26 0.45 -103 0 0 - 3 52 8 3 4 55.6 10 100 -33 - 3 45 31 - 3 58 47 - 3 41 32 - 4 2 45 0.45 -102 0 0 - 4 7 54 3 4 53.6 11 100 -34 - 4 1 15 - 4 14 33 - 3 57 17 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55 2 47 53.7 9 264 9 -50 7 24 -50 20 26 -50 3 30 -50 24 20 0.50 72 0 0 -50 6 57 2 47 52.7 8 263 10 -50 0 26 -50 13 29 -49 56 32 -50 17 23 0.50 73 0 0 -49 59 39 2 47 51.7 7 263 11 -49 53 8 -50 6 11 -49 49 13 -50 10 6 0.50 74 0 0 -49 52 1 2 47 50.8 7 262 11 -49 45 29 -49 58 34 -49 41 34 -50 2 29 0.50 75 0 0 -49 44 3 2 47 49.9 6 261 12 -49 37 30 -49 50 37 -49 33 35 -49 54 32 0.51 76 0 0 -49 35 45 2 47 49.2 5 260 13 -49 29 11 -49 42 19 -49 25 16 -49 46 15 0.51 77 0 0 -49 27 6 2 47 48.5 5 260 13 -49 20 32 -49 33 40 -49 16 36 -49 37 37 0.52 78 0 0 -49 18 6 2 47 47.9 4 259 14 -49 11 32 -49 24 42 -49 7 35 -49 28 38 0.53 79 0 0 -49 8 46 2 47 47.4 3 258 15 -49 2 11 -49 15 22 -48 58 14 -49 19 19 0.54 80 0 0 -48 59 5 2 47 47.0 3 257 15 -48 52 29 -49 5 42 -48 48 32 -49 9 39 0.56 81 0 0 -48 49 3 2 47 46.7 2 257 16 -48 42 26 -48 55 40 -48 38 29 -48 59 38 0.59 82 0 0 -48 38 40 2 47 46.4 1 256 17 -48 32 2 -48 45 18 -48 28 4 -48 49 17 0.64 83 0 0 -48 27 56 2 47 46.3 1 255 17 -48 21 17 -48 34 34 -48 17 19 -48 38 33 0.81 84 0 0 -48 16 50 2 47 46.2 0 254 18 -48 10 11 -48 23 29 -48 6 12 -48 27 29 4.92 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 14.3 Data for the target star ------------------------ * name: UCAC4 399-055916 * constellation : Libra * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 14 27 06.2323 DE: -10 19 43.099 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 14 27 06.2324 DE: -10 19 43.099 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.9 * B mag [mag]: 11.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1350) Rosselia asteroid class: approx. diameter [km]: 21 approx. diameter ["]: 0.014 distance from Earth [AU]: 2.15500 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#61 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): 0.016", 0.003", 104.7° remarks: * orbital elements for (1350)Rosselia : Mean anomaly = 195.9785094241 deg Arg. of pericenter = 237.5120773866 deg Long. of node = 139.4637697253 deg Inclination = 2.9432022639 deg Eccentricity = 0.0861595310 Semimajor axis = 2.8590624019 AU Perihelion dist = 2.6127269262 AU Mag: H = 10.73, G = 0.15 Epoch of elements : MJD 60404.12251050 TDT (2024 Apr 04.1225) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#612023Apr24,1.94,2024,4,4,2.940254,-0.172549,-0.393528,-5.728496,2.509752,-0.002337,0.000394,0.000001,0.000000 -19.9219,-10.4395,136.63,5.85,False UCAC4 399-055916,14.45173119,-10.3286386,11.37,10.87,10.60,0.0,0,,14.47365922,-10.4394900,4.54,4.36,0,0,0 1350,Rosselia,15.39,21.475,2.1550,0,0,-1.585,10.24,,1.2,0 0,195.9535,2024,4,4,237.5121,139.4638,2.9432,0.08616,2.85906,2.61273,10.73,5.0,0.15 1.299,0.0160,0.0033,105,0.0041,Known errors,1.14,0,-1,-1 20240404_055916,60139.27 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 06:31 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org