IOTA/IOTA-ES occultation update for (308) Polyxo / TYC 6274-00133-1 event on 2024 Oct 20, 18:54 UT Visible from Summary ------- On 2024 Oct 20 UT, the 136.594 km diameter asteroid (308) Polyxo will occult a 10.2 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 3.41 mag to 13.55 mag (the magnitude of the asteroid) for at most 4.760 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 20, 18:51 - 2024 Oct 20, 18:58 * geocentric midpoint of event [JD]: 2460604.28818779 * magnitude of target star: 10.19 * magnitude drop [mag]: 3.41 * estimated maximum duration [s]: 4.760 * Moon: 84 % sunlit, 156° distance * Sun: 69° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 141 * 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", 89°) * approx speed of asteroid's shadow [km/s]: 28.6760 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6274-00133-1 by 308 Polyxo on 2024 Oct 20 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 -129 0 0 -12 48 31 18 51 23.7 1 110 68 -13 29 21 -12 7 48 -13 31 27 -12 5 43 .... -128 0 0 -13 10 6 18 51 23.8 2 110 69 -13 50 57 -12 29 23 -13 53 3 -12 27 18 0.26 -127 0 0 -13 31 42 18 51 24.0 3 109 70 -14 12 34 -12 50 59 -14 14 40 -12 48 54 0.26 -126 0 0 -13 53 19 18 51 24.3 4 109 71 -14 34 12 -13 12 35 -14 36 17 -13 10 30 0.26 -125 0 0 -14 14 57 18 51 24.6 5 109 72 -14 55 49 -13 34 12 -14 57 55 -13 32 7 0.26 -124 0 0 -14 36 33 18 51 25.0 6 109 73 -15 17 26 -13 55 48 -15 19 32 -13 53 44 0.26 -123 0 0 -14 58 9 18 51 25.4 7 108 74 -15 39 2 -14 17 24 -15 41 8 -14 15 19 0.26 -122 0 0 -15 19 44 18 51 26.0 8 108 74 -16 0 37 -14 38 58 -16 2 42 -14 36 54 0.26 -121 0 0 -15 41 16 18 51 26.6 9 108 75 -16 22 9 -15 0 31 -16 24 15 -14 58 26 0.26 -120 0 0 -16 2 46 18 51 27.3 10 108 76 -16 43 39 -15 22 1 -16 45 45 -15 19 56 0.26 -119 0 0 -16 24 13 18 51 28.0 11 107 77 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256 -45 -21 51 15 -20 30 7 -21 53 20 -20 28 2 0.27 40 0 0 -20 50 40 18 58 22.8 19 255 -46 -21 31 20 -20 10 8 -21 33 25 -20 8 4 0.27 41 0 0 -20 30 34 18 58 24.1 18 255 -47 -21 11 15 -19 50 1 -21 13 20 -19 47 56 0.27 42 0 0 -20 10 19 18 58 25.3 17 255 -48 -20 51 2 -19 29 44 -20 53 7 -19 27 40 0.27 43 0 0 -19 49 56 18 58 26.4 16 254 -49 -20 30 40 -19 9 20 -20 32 45 -19 7 15 0.28 44 0 0 -19 29 25 18 58 27.4 15 254 -49 -20 10 10 -18 48 47 -20 12 15 -18 46 43 0.28 45 0 0 -19 8 46 18 58 28.4 14 254 -50 -19 49 33 -18 28 7 -19 51 38 -18 26 3 0.28 46 0 0 -18 48 0 18 58 29.3 13 253 -51 -19 28 48 -18 7 21 -19 30 53 -18 5 16 0.28 47 0 0 -18 27 8 18 58 30.2 11 253 -52 -19 7 57 -17 46 27 -19 10 2 -17 44 23 0.28 48 0 0 -18 6 9 18 58 30.9 10 253 -53 -18 46 59 -17 25 28 -18 49 4 -17 23 23 0.28 49 0 0 -17 45 5 18 58 31.6 9 252 -54 -18 25 56 -17 4 23 -18 28 1 -17 2 18 0.29 50 0 0 -17 23 56 18 58 32.3 8 252 -55 -18 4 47 -16 43 13 -18 6 52 -16 41 8 0.29 51 0 0 -17 2 42 18 58 32.8 7 252 -56 -17 43 33 -16 21 58 -17 45 39 -16 19 53 0.29 52 0 0 -16 41 23 18 58 33.3 6 251 -57 -17 22 15 -16 0 39 -17 24 21 -15 58 34 0.30 53 0 0 -16 20 1 18 58 33.8 5 251 -57 -17 0 53 -15 39 17 -17 2 59 -15 37 12 0.31 54 0 0 -15 58 35 18 58 34.1 4 251 -58 -16 39 28 -15 17 51 -16 41 33 -15 15 46 0.32 55 0 0 -15 37 7 18 58 34.4 3 251 -59 -16 17 59 -14 56 22 -16 20 5 -14 54 17 0.34 56 0 0 -15 15 36 18 58 34.6 2 250 -60 -15 56 29 -14 34 51 -15 58 34 -14 32 47 0.37 57 0 0 -14 54 4 18 58 34.7 1 250 -61 -15 34 56 -14 13 19 -15 37 2 -14 11 14 0.47 58 0 0 -14 32 30 18 58 34.8 0 250 -61 -15 13 22 -13 51 45 -15 15 28 .. .. .. 1.37 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: TYC 6274-00133-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 28 02.0200 DE: -19 36 10.483 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 28 02.0197 DE: -19 36 10.484 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.2 * B mag [mag]: 10.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (308) Polyxo asteroid class: approx. diameter [km]: 137 approx. diameter ["]: 0.067 distance from Earth [AU]: 2.82920 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", 89.141° remarks: * orbital elements for (308)Polyxo : Mean anomaly = 3.1158118931 deg Arg. of pericenter = 112.2472798587 deg Long. of node = 181.5833314622 deg Inclination = 4.3625737704 deg Eccentricity = 0.0386567231 Semimajor axis = 2.7496451587 AU Perihelion dist = 2.6433528871 AU Mag: H = 8.16, G = 0.21 Epoch of elements : MJD 60603.78818758 TDT (2024 Oct 20.7882) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1112023Apr24,4.76,2024,10,20,18.916507,-0.003618,-0.246254,16.183013,-0.284973,0.005347,0.000400,0.000000,0.000000 -36.0991,-19.5880,-107.58,-10.72,False TYC 6274-00133-1,18.46722780,-19.6029120,10.48,10.19,10.03,0.0,0,,18.49146504,-19.5879934,3.41,3.13,0,0,0 308,Polyxo,13.55,136.594,2.8292,0,0,3.560,-0.88,,7.6,0 0,2.9454,2024,10,20,112.2473,181.5833,4.3626,0.03866,2.74965,2.64335,8.16,5.0,0.15 1.026,0.0077,0.0017,89,0.0017,Known errors,0.76,0,-1,-1 20241020_0133-1,60140.65 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:34 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org