IOTA/IOTA-ES occultation update for (1306) Scythia / UCAC4 307-156987 event on 2024 Mar 11, 07:15 UT Visible from Summary ------- On 2024 Mar 11 UT, the 72.3964906401889 km diameter asteroid (1306) Scythia will occult a 11.9 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.09 mag to 15.93 mag (the magnitude of the asteroid) for at most 3.810 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 Mar 11, 07:10 - 2024 Mar 11, 07:21 * geocentric midpoint of event [JD]: 2460380.80273400 * magnitude of target star: 11.87 * magnitude drop [mag]: 4.09 * estimated maximum duration [s]: 3.810 * Moon: 2 % sunlit, 95° distance * Sun: 81° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 75 * 1 sigma uncertainty interval [path widths]: +/- 0.15 * 1 sigma uncertainty interval [seconds]: +/- 2.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.017, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.017", 0.003", 74°) * approx speed of asteroid's shadow [km/s]: 19.6100 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 307-156987 by 1306 Scythia on 2024 Mar 11 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 - 97 0 0 - 2 37 36 7 10 31.0 1 119 -80 - 3 0 42 - 2 14 30 - 3 7 26 - 2 7 46 .... - 96 0 0 - 3 10 40 7 10 31.2 2 119 -79 - 3 33 45 - 2 47 34 - 3 40 29 - 2 40 51 0.07 - 95 0 0 - 3 43 36 7 10 31.5 3 119 -78 - 4 6 41 - 3 20 32 - 4 13 24 - 3 13 49 0.04 - 94 0 0 - 4 16 25 7 10 31.9 4 119 -76 - 4 39 28 - 3 53 21 - 4 46 10 - 3 46 39 0.02 - 93 0 0 - 4 49 4 7 10 32.4 5 119 -75 - 5 12 5 - 4 26 2 - 5 18 48 - 4 19 19 0.01 - 92 0 0 - 5 21 33 7 10 33.1 7 118 -74 - 5 44 33 - 4 58 32 - 5 51 15 - 4 51 50 0.01 - 91 0 0 - 5 53 51 7 10 33.9 8 118 -73 - 6 16 49 - 5 30 52 - 6 23 31 - 5 24 10 0.00 - 90 0 0 - 6 25 57 7 10 34.8 9 118 -72 - 6 48 54 - 6 3 0 - 6 55 35 - 5 56 19 0.00 - 89 0 0 - 6 57 50 7 10 35.8 10 118 -71 - 7 20 45 - 6 34 55 - 7 27 26 - 6 28 14 0.00 - 88 0 0 - 7 29 30 7 10 37.0 11 118 -70 - 7 52 23 - 7 6 36 - 7 59 3 - 6 59 56 0.00 - 87 0 0 - 8 0 55 7 10 38.3 12 118 -69 - 8 23 47 - 7 38 4 - 8 30 26 - 7 31 24 0.00 - 86 0 0 - 8 32 5 7 10 39.7 13 118 -67 - 8 54 54 - 8 9 16 - 9 1 33 - 8 2 37 -0.01 - 85 0 0 - 9 2 59 7 10 41.2 14 118 -66 - 9 25 46 - 8 40 12 - 9 32 24 - 8 33 34 -0.01 - 84 0 0 - 9 33 36 7 10 42.8 16 117 -65 - 9 56 21 - 9 10 51 -10 2 58 - 9 4 14 -0.01 - 83 0 0 -10 3 56 7 10 44.6 17 117 -64 -10 26 38 - 9 41 13 -10 33 15 - 9 34 36 -0.01 - 82 0 0 -10 33 57 7 10 46.5 18 117 -63 -10 56 37 -10 11 17 -11 3 13 -10 4 41 -0.01 - 81 0 0 -11 3 39 7 10 48.4 19 117 -62 -11 26 16 -10 41 1 -11 32 52 -10 34 26 -0.01 - 80 0 0 -11 33 1 7 10 50.5 20 117 -61 -11 55 36 -11 10 26 -12 2 11 -11 3 52 -0.01 - 79 0 0 -12 2 4 7 10 52.7 21 116 -60 -12 24 36 -11 39 31 -12 31 9 -11 32 58 -0.01 - 78 0 0 -12 30 45 7 10 55.0 22 116 -59 -12 53 14 -12 8 15 -12 59 47 -12 1 42 -0.01 - 77 0 0 -12 59 4 7 10 57.4 23 116 -57 -13 21 31 -12 36 38 -13 28 3 -12 30 5 -0.01 - 76 0 0 -13 27 2 7 10 59.9 24 116 -56 -13 49 25 -13 4 38 -13 55 56 -12 58 7 -0.01 - 75 0 0 -13 54 36 7 11 2.5 25 116 -55 -14 16 57 -13 32 15 -14 23 27 -13 25 45 -0.01 - 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Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 14.2 Data for the target star ------------------------ * name: UCAC4 307-156987 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 00 44.6137 DE: -28 46 48.192 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 00 44.6137 DE: -28 46 48.192 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.500,0.300) * V mag [mag]: 11.9 * B mag [mag]: 14.4 * Diameter [mas]: 0.90 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1306) Scythia asteroid class: approx. diameter [km]: 72 approx. diameter ["]: 0.029 distance from Earth [AU]: 3.44930 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#65 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): 0.017", 0.003", 74.1° remarks: * orbital elements for (1306)Scythia : Mean anomaly = 200.3986009109 deg Arg. of pericenter = 141.8670435641 deg Long. of node = 274.0370411578 deg Inclination = 14.9861100767 deg Eccentricity = 0.0967631055 Semimajor axis = 3.1443759132 AU Perihelion dist = 2.8401163351 AU Mag: H = 9.67, G = 0.15 Epoch of elements : MJD 60380.30273370 TDT (2024 Mar 11.3027) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#652023Apr24,3.81,2024,3,11,7.265616,-0.001697,0.029092,11.038766,0.809884,-0.005916,-0.000112,0.000000,0.000000 -7.8622,-28.7813,73.50,-3.48,False UCAC4 307-156987,18.01239268,-28.7800535,14.39,11.87,10.51,0.9,0,,18.03781834,-28.7812567,4.08,4.98,0,0,0 1306,Scythia,15.93,74.648,3.4493,0,0,2.141,2.07,,3.8,0 0,200.3451,2024,3,11,141.8670,274.0370,14.9861,0.09676,3.14438,2.84012,9.67,5.0,0.15 1.146,0.0173,0.0026,74,0.0043,Known errors,0.50,0,-1,-1 20240311_156987,60139.23 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 05:24 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org