IOTA/IOTA-ES occultation update for (308) Polyxo / UCAC4 353-126240 event on 2024 Oct 10, 16:05 UT Visible from Summary ------- On 2024 Oct 10 UT, the 136.535 km diameter asteroid (308) Polyxo 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 1.79 mag to 13.48 mag (the magnitude of the asteroid) for at most 5.410 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 10, 16:01 - 2024 Oct 10, 16:09 * geocentric midpoint of event [JD]: 2460594.17061696 * magnitude of target star: 11.92 * magnitude drop [mag]: 1.79 * estimated maximum duration [s]: 5.410 * Moon: 49 % sunlit, 16° distance * Sun: 76° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 139 * 1 sigma uncertainty interval [path widths]: +/- 0.03 * 1 sigma uncertainty interval [seconds]: +/- 0.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.008, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.008", 0.002", 90°) * approx speed of asteroid's shadow [km/s]: 25.2455 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 353-126240 by 308 Polyxo on 2024 Oct 10 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 - 78 0 0 - 6 48 12 16 1 32.7 1 110 76 - 7 28 15 - 6 8 15 - 7 30 20 - 6 6 11 .... - 77 0 0 - 7 9 39 16 1 32.8 2 109 77 - 7 49 43 - 6 29 41 - 7 51 48 - 6 27 37 0.20 - 76 0 0 - 7 31 11 16 1 32.9 3 109 78 - 8 11 15 - 6 51 11 - 8 13 20 - 6 49 7 0.19 - 75 0 0 - 7 52 45 16 1 33.2 4 109 79 - 8 32 51 - 7 12 45 - 8 34 56 - 7 10 40 0.19 - 74 0 0 - 8 14 23 16 1 33.6 5 109 80 - 8 54 29 - 7 34 22 - 8 56 34 - 7 32 17 0.19 - 73 0 0 - 8 36 3 16 1 34.0 6 109 81 - 9 16 10 - 7 56 1 - 9 18 15 - 7 53 56 0.19 - 72 0 0 - 8 57 45 16 1 34.5 7 109 82 - 9 37 52 - 8 17 42 - 9 39 58 - 8 15 38 0.19 - 71 0 0 - 9 19 28 16 1 35.1 8 109 82 - 9 59 36 - 8 39 25 -10 1 41 - 8 37 20 0.19 - 70 0 0 - 9 41 12 16 1 35.8 9 108 83 -10 21 21 - 9 1 9 -10 23 26 - 8 59 4 0.19 - 69 0 0 -10 2 57 16 1 36.6 10 108 84 -10 43 6 - 9 22 54 -10 45 11 - 9 20 49 0.19 - 68 0 0 -10 24 42 16 1 37.5 11 108 85 -11 4 51 - 9 44 38 -11 6 56 - 9 42 33 0.19 - 67 0 0 -10 46 26 16 1 38.4 12 108 85 -11 26 35 -10 6 22 -11 28 40 -10 4 17 0.19 - 66 0 0 -11 8 9 16 1 39.5 13 108 85 -11 48 18 -10 28 5 -11 50 23 -10 26 0 0.19 - 65 0 0 -11 29 50 16 1 40.6 14 107 85 -12 9 59 -10 49 46 -12 12 5 -10 47 42 0.19 - 64 0 0 -11 51 29 16 1 41.8 15 107 85 -12 31 38 -11 11 26 -12 33 44 -11 9 21 0.19 - 63 0 0 -12 13 6 16 1 43.1 16 107 85 -12 53 14 -11 33 3 -12 55 20 -11 30 58 0.19 - 62 0 0 -12 34 39 16 1 44.4 17 107 84 -13 14 48 -11 54 37 -13 16 53 -11 52 32 0.19 - 61 0 0 -12 56 9 16 1 45.9 18 107 83 -13 36 17 -12 16 7 -13 38 22 -12 14 2 0.19 - 60 0 0 -13 17 35 16 1 47.4 19 106 83 -13 57 42 -12 37 33 -13 59 47 -12 35 29 0.19 - 59 0 0 -13 38 56 16 1 49.0 21 106 82 -14 19 2 -12 58 55 -14 21 8 -12 56 51 0.19 - 58 0 0 -14 0 12 16 1 50.7 22 106 81 -14 40 18 -13 20 12 -14 42 23 -13 18 7 0.18 - 57 0 0 -14 21 23 16 1 52.4 23 105 80 -15 1 27 -13 41 23 -15 3 32 -13 39 19 0.18 - 56 0 0 -14 42 27 16 1 54.2 24 105 79 -15 22 30 -14 2 29 -15 24 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50 16 9 50.1 0 250 -69 -13 14 57 .. .. .. -13 17 2 .. .. .. 1.43 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 353-126240 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 14 11.4264 DE: -19 28 42.721 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 14 11.4264 DE: -19 28 42.721 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.9 * B mag [mag]: 12.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (308) Polyxo asteroid class: approx. diameter [km]: 137 approx. diameter ["]: 0.070 distance from Earth [AU]: 2.70320 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", 90.092° remarks: * orbital elements for (308)Polyxo : Mean anomaly = 0.9265781927 deg Arg. of pericenter = 112.2493621403 deg Long. of node = 181.5835485679 deg Inclination = 4.3625662698 deg Eccentricity = 0.0386666982 Semimajor axis = 2.7496738284 AU Perihelion dist = 2.6433530202 AU Mag: H = 8.16, G = 0.21 Epoch of elements : MJD 60593.67061675 TDT (2024 Oct 10.6706) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1112023Apr24,5.41,2024,10,10,16.094807,-0.009889,-0.174799,14.228102,-0.775897,0.005533,0.000251,0.000000,0.000000 12.7382,-19.4719,-64.71,-7.00,False UCAC4 353-126240,18.23650737,-19.4785335,12.12,11.92,11.81,0.0,0,,18.26076193,-19.4718535,1.79,1.52,0,0,0 308,Polyxo,13.48,136.535,2.7032,0,0,3.274,-2.52,,7.6,0 0,0.7816,2024,10,10,112.2494,181.5835,4.3626,0.03867,2.74967,2.64335,8.16,5.0,0.15 1.026,0.0080,0.0018,90,0.0018,Known errors,0.82,0,-1,-1 20241010_126240,60140.62 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 14:59 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org