IOTA/IOTA-ES occultation update for (1571) Cesco / UCAC4 339-162665 event on 2024 Oct 23, 19:49 UT Visible from Summary ------- On 2024 Oct 23 UT, the 21.5452352109629 km diameter asteroid (1571) Cesco will occult a 11.8 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 6.06 mag to 17.88 mag (the magnitude of the asteroid) for at most 0.860 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: 97 * date and approx. time of event: 2024 Oct 23, 19:45 - 2024 Oct 23, 19:53 * geocentric midpoint of event [JD]: 2460607.32589567 * magnitude of target star: 11.82 * magnitude drop [mag]: 6.06 * estimated maximum duration [s]: 0.860 * Moon: 55 % sunlit, 164° distance * Sun: 69° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 24 * 1 sigma uncertainty interval [path widths]: +/- 0.40 * 1 sigma uncertainty interval [seconds]: +/- 1.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.014", 0.003", 71°) * approx speed of asteroid's shadow [km/s]: 25.2758 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 339-162665 by 1571 Cesco on 2024 Oct 23 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 -155 0 0 -35 58 17 19 45 32.3 0 118 51 -36 5 47 -35 50 48 -36 11 46 -35 44 51 .... -154 0 0 -36 23 50 19 45 32.4 1 117 51 -36 31 19 -36 16 21 -36 37 17 -36 10 24 0.45 -153 0 0 -36 49 6 19 45 32.5 2 116 51 -36 56 34 -36 41 37 -37 2 32 -36 35 41 0.48 -152 0 0 -37 14 4 19 45 32.7 3 116 52 -37 21 33 -37 6 37 -37 27 30 -37 0 41 0.49 -151 0 0 -37 38 46 19 45 32.9 4 115 52 -37 46 13 -37 31 19 -37 52 10 -37 25 24 0.50 -150 0 0 -38 3 9 19 45 33.3 5 115 53 -38 10 36 -37 55 43 -38 16 32 -37 49 48 0.50 -149 0 0 -38 27 15 19 45 33.6 5 114 53 -38 34 41 -38 19 49 -38 40 36 -38 13 55 0.50 -148 0 0 -38 51 1 19 45 34.1 6 113 53 -38 58 27 -38 43 37 -39 4 22 -38 37 43 0.50 -147 0 0 -39 14 29 19 45 34.6 7 113 54 -39 21 54 -39 7 5 -39 27 48 -39 1 12 0.50 -146 0 0 -39 37 37 19 45 35.2 8 112 54 -39 45 1 -39 30 14 -39 50 55 -39 24 22 0.50 -145 0 0 -40 0 26 19 45 35.8 9 111 54 -40 7 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24 -16 45 1 0.56 38 0 0 -16 31 4 19 53 0.2 8 249 -56 -16 38 24 -16 23 45 -16 44 15 -16 17 55 0.56 39 0 0 -16 4 12 19 53 0.9 7 249 -57 -16 11 32 -15 56 54 -16 17 22 -15 51 5 0.57 40 0 0 -15 37 37 19 53 1.5 6 249 -57 -15 44 55 -15 30 19 -15 50 44 -15 24 31 0.58 41 0 0 -15 11 17 19 53 1.9 5 248 -58 -15 18 35 -15 4 1 -15 24 23 -14 58 13 0.60 42 0 0 -14 45 16 19 53 2.3 4 248 -59 -14 52 32 -14 38 0 -14 58 20 -14 32 13 0.62 43 0 0 -14 19 32 19 53 2.6 3 248 -60 -14 26 47 -14 12 17 -14 32 34 -14 6 31 0.67 44 0 0 -13 54 7 19 53 2.8 2 248 -61 -14 1 21 -13 46 53 -14 7 7 -13 41 8 0.77 45 0 0 -13 29 0 19 53 2.9 1 247 -62 -13 36 14 -13 21 48 -13 41 59 -13 16 3 1.25 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 339-162665 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 42 42.5741 DE: -22 13 01.527 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 42 42.5740 DE: -22 13 01.527 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.8 * B mag [mag]: 12.9 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1571) Cesco asteroid class: approx. diameter [km]: 22 approx. diameter ["]: 0.008 distance from Earth [AU]: 3.60920 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#58 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): 0.014", 0.003", 70.535° remarks: * orbital elements for (1571)Cesco : Mean anomaly = 231.7905752325 deg Arg. of pericenter = 141.3220215127 deg Long. of node = 292.3178688087 deg Inclination = 14.5975517145 deg Eccentricity = 0.1153404661 Semimajor axis = 3.1410697247 AU Perihelion dist = 2.7787772787 AU Mag: H = 11.58, G = 0.15 Epoch of elements : MJD 60606.82589546 TDT (2024 Oct 23.8259) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#582023Apr24,0.86,2024,10,23,19.821496,0.096047,-0.438278,13.932691,3.067495,0.005543,0.000452,0.000000,0.000000 -48.9923,-22.1937,-121.27,-11.79,False UCAC4 339-162665,18.71182616,-22.2170909,12.88,11.82,11.25,0.1,0,,18.73652222,-22.1937155,6.07,6.19,0,0,0 1571,Cesco,17.88,21.807,3.6092,0,0,2.445,7.47,,2.0,0 0,231.6444,2024,10,23,141.3220,292.3179,14.5976,0.11534,3.14107,2.77878,11.58,5.0,0.15 1.398,0.0143,0.0028,71,0.0033,Known errors,0.83,0,-1,-1 20241023_162665,60140.65 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:43 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org