IOTA/IOTA-ES occultation update for (82) Alkmene / UCAC4 435-121469 event on 2024 Sep 21, 11:36 UT Visible from Summary ------- On 2024 Sep 21 UT, the 59.643 km diameter asteroid (82) Alkmene 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 1.51 mag to 12.59 mag (the magnitude of the asteroid) for at most 4.150 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: 100 * date and approx. time of event: 2024 Sep 21, 11:28 - 2024 Sep 21, 11:43 * geocentric midpoint of event [JD]: 2460574.98335725 * magnitude of target star: 11.39 * magnitude drop [mag]: 1.51 * estimated maximum duration [s]: 4.150 * Moon: 84 % sunlit, 49° distance * Sun: 177° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 61 * 1 sigma uncertainty interval [path widths]: +/- 0.05 * 1 sigma uncertainty interval [seconds]: +/- 0.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.006, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.007", 0.002", 63°) * approx speed of asteroid's shadow [km/s]: 14.3733 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 435-121469 by 82 Alkmene on 2024 Sep 21 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 90 0 0 -34 39 18 11 43 12.6 1 93 2 -34 22 40 -34 55 57 -34 20 52 -34 57 45 .... 91 0 0 -34 42 4 11 43 12.4 1 93 1 -34 25 26 -34 58 43 -34 23 38 -35 0 31 0.19 92 0 0 -34 44 31 11 43 12.2 2 92 0 -34 27 54 -35 1 10 -34 26 6 -35 2 58 0.21 93 0 0 -34 46 40 11 43 11.9 3 92 -1 -34 30 2 -35 3 18 -34 28 14 -35 5 6 0.22 94 0 0 -34 48 29 11 43 11.5 4 91 -2 -34 31 52 -35 5 7 -34 30 4 -35 6 55 0.22 95 0 0 -34 49 59 11 43 11.0 5 90 -2 -34 33 22 -35 6 37 -34 31 34 -35 8 25 0.23 96 0 0 -34 51 10 11 43 10.5 6 90 -3 -34 34 33 -35 7 48 -34 32 45 -35 9 36 0.23 97 0 0 -34 52 2 11 43 9.8 6 89 -4 -34 35 25 -35 8 40 -34 33 38 -35 10 28 0.23 98 0 0 -34 52 35 11 43 9.0 7 89 -5 -34 35 59 -35 9 13 -34 34 11 -35 11 1 0.23 99 0 0 -34 52 50 11 43 8.2 8 88 -6 -34 36 13 -35 9 27 -34 34 25 -35 11 16 0.23 100 0 0 -34 52 45 11 43 7.2 9 88 -6 -34 36 8 -35 9 23 -34 34 20 -35 11 11 0.23 101 0 0 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15 8 6 38 10 0.49 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 435-121469 * constellation : Pisces * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 23 50 42.4894 DE: -03 08 23.318 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 23 50 42.4894 DE: -03 08 23.318 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.4 * B mag [mag]: 11.7 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (82) Alkmene asteroid class: approx. diameter [km]: 60 approx. diameter ["]: 0.038 distance from Earth [AU]: 2.15050 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#130 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): 0.007", 0.002", 63.418° remarks: * orbital elements for (82)Alkmene : Mean anomaly = 239.7813430524 deg Arg. of pericenter = 110.8830473659 deg Long. of node = 25.4267019659 deg Inclination = 2.8263569028 deg Eccentricity = 0.2208963450 Semimajor axis = 2.7620071206 AU Perihelion dist = 2.1518898429 AU Mag: H = 8.30, G = 0.28 Epoch of elements : MJD 60574.48335704 TDT (2024 Sep 21.4834) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1302023Apr24,4.15,2024,9,21,11.600574,0.084180,-0.222625,-7.588496,-2.868852,0.000083,0.000248,0.000001,0.000001 -176.8491,-3.0004,4.22,0.41,False UCAC4 435-121469,23.84513595,-3.1398104,11.71,11.39,11.22,0.0,0,,23.86658845,-3.0003889,1.51,1.31,0,0,0 82,Alkmene,12.59,59.643,2.1505,0,0,-2.071,-11.73,,3.2,0 0,239.6776,2024,9,21,110.8830,25.4267,2.8264,0.22090,2.76201,2.15189,8.29,5.0,0.15 1.054,0.0067,0.0020,63,0.0021,Known errors,1.03,0,-1,-1 20240921_121469,60140.58 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 13:49 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org