IOTA/IOTA-ES occultation update for (915) Cosette / G235959.3+025032 event on 2024 Dec 17, 18:51 UT Visible from Summary ------- On 2024 Dec 17 UT, the 11.936 km diameter asteroid (915) Cosette will occult a 11.4 mag star in the constellation Pisces for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.00 mag to 15.35 mag (the magnitude of the asteroid) for at most 0.720 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 Dec 17, 18:46 - 2024 Dec 17, 18:56 * geocentric midpoint of event [JD]: 2460662.28596921 * magnitude of target star: 11.38 * magnitude drop [mag]: 4.00 * estimated maximum duration [s]: 0.720 * Moon: 92 % sunlit, 116° distance * Sun: 95° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 15 * 1 sigma uncertainty interval [path widths]: +/- 0.25 * 1 sigma uncertainty interval [seconds]: +/- 1.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.009) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.002", 58°) * approx speed of asteroid's shadow [km/s]: 16.5927 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of G235959.3+025032 by 915 Cosette on 2024 Dec 17 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 - 91 0 0 -66 56 59 18 46 51.4 0 82 46 -67 1 11 -66 52 47 -67 3 17 -66 50 42 .... - 90 0 0 -66 53 38 18 46 51.4 1 81 46 -66 57 51 -66 49 26 -66 59 57 -66 47 21 0.41 - 89 0 0 -66 50 2 18 46 51.4 1 80 46 -66 54 15 -66 45 50 -66 56 21 -66 43 44 0.58 - 88 0 0 -66 46 11 18 46 51.5 1 79 46 -66 50 24 -66 41 58 -66 52 30 -66 39 52 0.65 - 87 0 0 -66 42 3 18 46 51.6 2 78 46 -66 46 17 -66 37 50 -66 48 23 -66 35 44 0.69 - 86 0 0 -66 37 40 18 46 51.7 2 78 45 -66 41 54 -66 33 26 -66 44 1 -66 31 20 0.71 - 85 0 0 -66 33 1 18 46 51.9 3 77 45 -66 37 16 -66 28 47 -66 39 22 -66 26 40 0.73 - 84 0 0 -66 28 6 18 46 52.0 3 76 45 -66 32 21 -66 23 51 -66 34 28 -66 21 44 0.74 - 83 0 0 -66 22 54 18 46 52.2 3 75 45 -66 27 10 -66 18 39 -66 29 17 -66 16 32 0.75 - 82 0 0 -66 17 26 18 46 52.4 4 74 45 -66 21 42 -66 13 10 -66 23 50 -66 11 3 0.75 - 81 0 0 -66 11 41 18 46 52.7 4 73 45 -66 15 58 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45.0 1 273 -55 -11 47 8 -11 38 46 -11 49 14 -11 36 41 1.45 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: G235959.3+025032 * constellation : Pisces * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 23 59 59.3124 DE: +02 50 31.265 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 23 59 59.3121 DE: +02 50 31.263 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.500,0.200) * V mag [mag]: 11.4 * B mag [mag]: 11.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (915) Cosette asteroid class: approx. diameter [km]: 12 approx. diameter ["]: 0.010 distance from Earth [AU]: 1.57170 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): 0.016", 0.002", 58.427° remarks: * orbital elements for (915)Cosette : Mean anomaly = 347.0936647942 deg Arg. of pericenter = 39.7513607430 deg Long. of node = 9.2559963406 deg Inclination = 5.5460826557 deg Eccentricity = 0.1394961030 Semimajor axis = 2.2276775421 AU Perihelion dist = 1.9169252063 AU Mag: H = 11.63, G = 0.15 Epoch of elements : MJD 60661.78596971 TDT (2024 Dec 17.7860) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#502023Apr24,0.72,2024,12,17,18.863261,0.293746,-0.560792,8.299785,4.338653,0.004911,0.002104,0.000000,0.000000 -9.5212,2.9814,-103.83,-23.39,False G235959.3+025032,23.99980902,2.8420183,11.77,11.38,11.17,0.0,0,,0.02113694,2.9813621,4.00,3.77,0,0,0 915,Cosette,15.35,11.936,1.5717,0,0,3.101,24.28,,1.0,0 0,346.8607,2024,12,17,39.7514,9.2560,5.5461,0.13950,2.22768,1.91693,11.63,5.0,0.15 1.249,0.0160,0.0024,58,0.0026,Known errors,2.08,0,-1,-1 20241217_025032,60140.74 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 17:51 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org