IOTA/IOTA-ES occultation update for (308) Polyxo / UCAC4 352-146077 event on 2024 Oct 29, 13:32 UT Visible from Summary ------- On 2024 Oct 29 UT, the 136.541 km diameter asteroid (308) Polyxo will occult a 11.7 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 2.07 mag to 13.60 mag (the magnitude of the asteroid) for at most 4.330 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 Oct 29, 13:29 - 2024 Oct 29, 13:36 * geocentric midpoint of event [JD]: 2460613.06441588 * magnitude of target star: 11.70 * magnitude drop [mag]: 2.07 * estimated maximum duration [s]: 4.330 * Moon: 8 % sunlit, 96° distance * Sun: 63° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 137 * 1 sigma uncertainty interval [path widths]: +/- 0.03 * 1 sigma uncertainty interval [seconds]: +/- 0.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.008, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.008", 0.002", 88°) * approx speed of asteroid's shadow [km/s]: 31.5099 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 352-146077 by 308 Polyxo on 2024 Oct 29 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 - 52 0 0 - 5 19 12 13 29 23.9 0 110 63 - 5 58 43 .. .. .. - 6 0 44 .. .. .. .... - 51 0 0 - 5 40 42 13 29 24.0 1 110 64 - 6 20 14 - 5 1 13 - 6 22 15 - 4 59 13 0.16 - 50 0 0 - 6 2 12 13 29 24.1 2 109 66 - 6 41 43 - 5 22 43 - 6 43 44 - 5 20 42 0.13 - 49 0 0 - 6 23 39 13 29 24.3 3 109 67 - 7 3 10 - 5 44 11 - 7 5 11 - 5 42 10 0.11 - 48 0 0 - 6 45 5 13 29 24.5 4 109 68 - 7 24 36 - 6 5 37 - 7 26 37 - 6 3 36 0.11 - 47 0 0 - 7 6 28 13 29 24.8 5 109 69 - 7 45 59 - 6 27 1 - 7 48 0 - 6 25 0 0.10 - 46 0 0 - 7 27 49 13 29 25.2 6 109 70 - 8 7 18 - 6 48 21 - 8 9 19 - 6 46 21 0.10 - 45 0 0 - 7 49 5 13 29 25.6 7 109 71 - 8 28 35 - 7 9 39 - 8 30 35 - 7 7 38 0.10 - 44 0 0 - 8 10 18 13 29 26.2 8 109 72 - 8 49 47 - 7 30 52 - 8 51 47 - 7 28 52 0.10 - 43 0 0 - 8 31 26 13 29 26.7 10 109 73 - 9 10 54 - 7 52 1 - 9 12 55 - 7 50 1 0.10 - 42 0 0 - 8 52 30 13 29 27.4 11 108 74 - 9 31 57 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Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 352-146077 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 40 54.7137 DE: -19 37 00.412 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 40 54.7136 DE: -19 37 00.412 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.7 * B mag [mag]: 11.9 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (308) Polyxo asteroid class: approx. diameter [km]: 137 approx. diameter ["]: 0.064 distance from Earth [AU]: 2.93450 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#111 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): 0.008", 0.002", 88.242° remarks: * orbital elements for (308)Polyxo : Mean anomaly = 5.0152668325 deg Arg. of pericenter = 112.2450459880 deg Long. of node = 181.5831496591 deg Inclination = 4.3625807082 deg Eccentricity = 0.0386474144 Semimajor axis = 2.7496182724 AU Perihelion dist = 2.6433526355 AU Mag: H = 8.16, G = 0.21 Epoch of elements : MJD 60612.56441558 TDT (2024 Oct 29.5644) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1112023Apr24,4.33,2024,10,29,13.545981,0.000631,-0.084537,17.783526,0.234398,0.005175,0.000537,-0.000001,0.000000 39.0275,-19.5943,-27.27,-13.73,False UCAC4 352-146077,18.68186495,-19.6167811,11.89,11.70,11.60,0.0,0,,18.70606682,-19.5942998,2.07,1.78,0,0,0 308,Polyxo,13.60,136.541,2.9345,0,0,3.771,0.71,,7.6,0 0,4.8933,2024,10,29,112.2450,181.5831,4.3626,0.03865,2.74962,2.64335,8.16,5.0,0.15 1.025,0.0077,0.0016,88,0.0016,Known errors,0.92,0,-1,-1 20241029_146077,60140.67 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:00 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org