IOTA/IOTA-ES occultation update for (308) Polyxo / UCAC4 355-183731 event on 2024 Nov 24, 16:35 UT Visible from Summary ------- On 2024 Nov 24 UT, the 136.528721349515 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 1.95 mag to 13.67 mag (the magnitude of the asteroid) for at most 3.540 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 Nov 24, 16:33 - 2024 Nov 24, 16:38 * geocentric midpoint of event [JD]: 2460639.19153833 * magnitude of target star: 11.92 * magnitude drop [mag]: 1.95 * estimated maximum duration [s]: 3.540 * Moon: 35 % sunlit, 119° distance * Sun: 47° 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]: +/- 0.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.007, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.007", 0.002", 85°) * approx speed of asteroid's shadow [km/s]: 38.8188 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 355-183731 by 308 Polyxo on 2024 Nov 24 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 -113 0 0 - 5 54 25 16 33 4.8 0 109 47 - 6 33 52 - 5 14 57 - 6 35 55 - 5 12 55 .... -112 0 0 - 6 15 8 16 33 4.8 1 109 48 - 6 54 35 - 5 35 42 - 6 56 37 - 5 33 40 0.09 -111 0 0 - 6 35 44 16 33 4.9 2 109 49 - 7 15 9 - 5 56 19 - 7 17 11 - 5 54 17 0.06 -110 0 0 - 6 56 12 16 33 5.1 3 109 50 - 7 35 35 - 6 16 49 - 7 37 37 - 6 14 47 0.04 -109 0 0 - 7 16 31 16 33 5.3 5 109 51 - 7 55 53 - 6 37 9 - 7 57 55 - 6 35 7 0.03 -108 0 0 - 7 36 41 16 33 5.6 6 108 52 - 8 16 1 - 6 57 21 - 8 18 3 - 6 55 19 0.03 -107 0 0 - 7 56 41 16 33 5.9 7 108 53 - 8 36 0 - 7 17 23 - 8 38 1 - 7 15 22 0.03 -106 0 0 - 8 16 32 16 33 6.2 8 108 54 - 8 55 49 - 7 37 16 - 8 57 50 - 7 35 14 0.02 -105 0 0 - 8 36 12 16 33 6.7 9 108 56 - 9 15 27 - 7 56 58 - 9 17 29 - 7 54 56 0.02 -104 0 0 - 8 55 42 16 33 7.2 10 108 57 - 9 34 55 - 8 16 29 - 9 36 56 - 8 14 28 0.02 -103 0 0 - 9 15 1 16 33 7.7 11 108 58 - 9 54 11 - 8 35 50 - 9 56 13 - 8 33 49 0.02 -102 0 0 - 9 34 8 16 33 8.3 12 108 59 -10 13 16 - 8 54 59 -10 15 17 - 8 52 58 0.02 -101 0 0 - 9 53 3 16 33 8.9 13 107 60 -10 32 9 - 9 13 56 -10 34 10 - 9 11 55 0.02 -100 0 0 -10 11 46 16 33 9.6 14 107 61 -10 50 50 - 9 32 42 -10 52 51 - 9 30 41 0.02 - 99 0 0 -10 30 16 16 33 10.3 15 107 62 -11 9 18 - 9 51 14 -11 11 19 - 9 49 14 0.02 - 98 0 0 -10 48 34 16 33 11.1 16 107 63 -11 27 34 -10 9 34 -11 29 34 -10 7 33 0.01 - 97 0 0 -11 6 38 16 33 12.0 17 107 64 -11 45 36 -10 27 41 -11 47 36 -10 25 40 0.01 - 96 0 0 -11 24 29 16 33 12.9 18 107 65 -12 3 24 -10 45 34 -12 5 24 -10 43 33 0.01 - 95 0 0 -11 42 6 16 33 13.8 19 106 66 -12 20 58 -11 3 13 -12 22 59 -11 1 13 0.01 - 94 0 0 -11 59 28 16 33 14.8 20 106 67 -12 38 19 -11 20 38 -12 40 19 -11 18 38 0.01 - 93 0 0 -12 16 36 16 33 15.8 21 106 68 -12 55 24 -11 37 48 -12 57 24 -11 35 48 0.01 - 92 0 0 -12 33 29 16 33 16.9 22 106 69 -13 12 15 -11 54 44 -13 14 15 -11 52 44 0.01 - 91 0 0 -12 50 8 16 33 18.0 23 105 70 -13 28 51 -12 11 25 -13 30 51 -12 9 25 0.01 - 90 0 0 -13 6 31 16 33 19.2 24 105 71 -13 45 11 -12 27 50 -13 47 11 -12 25 50 0.01 - 89 0 0 -13 22 38 16 33 20.4 25 105 72 -14 1 16 -12 44 0 -14 3 15 -12 42 0 0.01 - 88 0 0 -13 38 29 16 33 21.7 26 105 73 -14 17 5 -12 59 54 -14 19 4 -12 57 54 0.01 - 87 0 0 -13 54 4 16 33 23.0 27 105 74 -14 32 37 -13 15 31 -14 34 37 -13 13 32 0.01 - 86 0 0 -14 9 23 16 33 24.3 28 104 75 -14 47 54 -13 30 53 -14 49 53 -13 28 54 0.01 - 85 0 0 -14 24 26 16 33 25.7 29 104 76 -15 2 53 -13 45 58 -15 4 52 -13 43 59 0.01 - 84 0 0 -14 39 11 16 33 27.1 30 104 77 -15 17 36 -14 0 46 -15 19 35 -13 58 47 0.01 - 83 0 0 -14 53 40 16 33 28.6 31 104 78 -15 32 2 -14 15 17 -15 34 1 -14 13 18 0.01 - 82 0 0 -15 7 51 16 33 30.1 32 103 79 -15 46 11 -14 29 31 -15 48 10 -14 27 32 0.01 - 81 0 0 -15 21 45 16 33 31.7 33 103 79 -16 0 3 -14 43 27 -16 2 1 -14 41 28 0.01 - 80 0 0 -15 35 21 16 33 33.2 34 103 80 -16 13 36 -14 57 6 -16 15 35 -14 55 7 0.01 - 79 0 0 -15 48 39 16 33 34.9 35 102 81 -16 26 52 -15 10 27 -16 28 51 -15 8 28 0.01 - 78 0 0 -16 1 40 16 33 36.5 36 102 82 -16 39 50 -15 23 30 -16 41 49 -15 21 32 0.01 - 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9 44 39 -11 4 48 - 9 42 38 0.01 22 0 0 -10 5 2 16 37 42.9 46 253 -1 -10 44 8 - 9 25 55 -10 46 9 - 9 23 54 0.01 23 0 0 - 9 46 7 16 37 45.1 45 253 -2 -10 25 16 - 9 6 59 -10 27 17 - 9 4 58 0.01 24 0 0 - 9 27 1 16 37 47.2 44 253 -3 -10 6 11 - 8 47 50 -10 8 13 - 8 45 49 0.01 25 0 0 - 9 7 42 16 37 49.2 43 252 -4 - 9 46 55 - 8 28 29 - 9 48 56 - 8 26 28 0.01 26 0 0 - 8 48 12 16 37 51.3 42 252 -5 - 9 27 27 - 8 8 57 - 9 29 28 - 8 6 56 0.01 27 0 0 - 8 28 30 16 37 53.3 41 252 -6 - 9 7 47 - 7 49 14 - 9 9 49 - 7 47 12 0.01 28 0 0 - 8 8 38 16 37 55.2 40 252 -7 - 8 47 57 - 7 29 20 - 8 49 59 - 7 27 18 0.01 29 0 0 - 7 48 36 16 37 57.1 39 252 -8 - 8 27 57 - 7 9 15 - 8 29 58 - 7 7 14 0.01 30 0 0 - 7 28 23 16 37 59.0 38 252 -9 - 8 7 46 - 6 49 1 - 8 9 48 - 6 46 59 0.01 31 0 0 - 7 8 2 16 38 0.8 37 252 -10 - 7 47 26 - 6 28 38 - 7 49 28 - 6 26 36 0.01 32 0 0 - 6 47 31 16 38 2.6 36 251 -11 - 7 26 56 - 6 8 5 - 7 28 58 - 6 6 3 0.01 33 0 0 - 6 26 51 16 38 4.4 35 251 -12 - 7 6 18 - 5 47 24 - 7 8 21 - 5 45 22 0.01 34 0 0 - 6 6 3 16 38 6.1 34 251 -13 - 6 45 32 - 5 26 35 - 6 47 34 - 5 24 33 0.01 35 0 0 - 5 45 8 16 38 7.7 32 251 -14 - 6 24 38 - 5 5 38 - 6 26 40 - 5 3 36 0.01 36 0 0 - 5 24 5 16 38 9.3 31 251 -16 - 6 3 37 - 4 44 34 - 6 5 39 - 4 42 32 0.01 37 0 0 - 5 2 56 16 38 10.9 30 251 -17 - 5 42 29 - 4 23 23 - 5 44 31 - 4 21 21 0.01 38 0 0 - 4 41 40 16 38 12.4 29 251 -18 - 5 21 14 - 4 2 6 - 5 23 16 - 4 0 4 0.01 39 0 0 - 4 20 18 16 38 13.9 28 251 -19 - 4 59 53 - 3 40 44 - 5 1 56 - 3 38 41 0.01 40 0 0 - 3 58 51 16 38 15.3 27 251 -20 - 4 38 27 - 3 19 16 - 4 40 30 - 3 17 13 0.01 41 0 0 - 3 37 20 16 38 16.6 26 251 -21 - 4 16 56 - 2 57 43 - 4 18 59 - 2 55 41 0.01 42 0 0 - 3 15 43 16 38 18.0 25 251 -22 - 3 55 21 - 2 36 6 - 3 57 24 - 2 34 4 0.01 43 0 0 - 2 54 3 16 38 19.2 24 250 -23 - 3 33 42 - 2 14 25 - 3 35 44 - 2 12 23 0.01 44 0 0 - 2 32 20 16 38 20.4 23 250 -24 - 3 11 59 - 1 52 42 - 3 14 2 - 1 50 39 0.01 45 0 0 - 2 10 34 16 38 21.6 22 250 -25 - 2 50 13 - 1 30 55 - 2 52 16 - 1 28 52 0.01 46 0 0 - 1 48 45 16 38 22.7 21 250 -26 - 2 28 25 - 1 9 6 - 2 30 28 - 1 7 3 0.02 47 0 0 - 1 26 55 16 38 23.8 20 250 -27 - 2 6 35 - 0 47 15 - 2 8 38 - 0 45 13 0.02 48 0 0 - 1 5 3 16 38 24.8 19 250 -28 - 1 44 44 - 0 25 23 - 1 46 46 - 0 23 21 0.02 49 0 0 - 0 43 11 16 38 25.7 18 250 -29 - 1 22 51 - 0 3 31 - 1 24 54 - 0 1 28 0.02 50 0 0 - 0 21 18 16 38 26.6 16 250 -30 - 1 0 58 0 18 22 - 1 3 1 0 20 25 0.02 51 0 0 0 0 34 16 38 27.5 15 250 -31 - 0 39 6 0 40 14 - 0 41 8 0 42 17 0.02 52 0 0 0 22 26 16 38 28.3 14 250 -33 - 0 17 14 1 2 6 - 0 19 16 1 4 9 0.02 53 0 0 0 44 17 16 38 29.0 13 250 -34 0 4 37 1 23 56 0 2 35 1 25 59 0.02 54 0 0 1 6 6 16 38 29.7 12 250 -35 0 26 26 1 45 45 0 24 24 1 47 47 0.02 55 0 0 1 27 52 16 38 30.3 11 250 -36 0 48 14 2 7 31 0 46 11 2 9 33 0.02 56 0 0 1 49 36 16 38 30.8 10 250 -37 1 9 58 2 29 14 1 7 55 2 31 17 0.02 57 0 0 2 11 17 16 38 31.3 9 250 -38 1 31 39 2 50 54 1 29 37 2 52 57 0.02 58 0 0 2 32 54 16 38 31.8 8 250 -39 1 53 17 3 12 30 1 51 14 3 14 33 0.03 59 0 0 2 54 26 16 38 32.2 7 250 -40 2 14 50 3 34 2 2 12 48 3 36 4 0.03 60 0 0 3 15 54 16 38 32.5 6 250 -41 2 36 19 3 55 29 2 34 17 3 57 31 0.03 61 0 0 3 37 17 16 38 32.8 5 251 -42 2 57 43 4 16 50 2 55 40 4 18 53 0.04 62 0 0 3 58 34 16 38 33.0 4 251 -43 3 19 1 4 38 6 3 16 59 4 40 9 0.04 63 0 0 4 19 45 16 38 33.2 3 251 -44 3 40 13 4 59 16 3 38 11 5 1 18 0.06 64 0 0 4 40 49 16 38 33.3 2 251 -45 4 1 19 5 20 19 3 59 16 5 22 21 0.09 65 0 0 5 1 46 16 38 33.4 1 251 -46 4 22 17 5 41 15 4 20 15 5 43 17 0.24 Uncertainty in time = +/- 0 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 355-183731 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 22 49.9525 DE: -19 03 46.767 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 22 49.9525 DE: -19 03 46.767 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.400,0.300) * V mag [mag]: 11.9 * B mag [mag]: 14.0 * Diameter [mas]: 0.40 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (308) Polyxo asteroid class: approx. diameter [km]: 137 approx. diameter ["]: 0.059 distance from Earth [AU]: 3.21700 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): 0.007", 0.001", 85.258° remarks: * orbital elements for (308)Polyxo : Mean anomaly = 10.6741204780 deg Arg. of pericenter = 112.2344606979 deg Long. of node = 181.5825904156 deg Inclination = 4.3626060892 deg Eccentricity = 0.0386162979 Semimajor axis = 2.7495271528 AU Perihelion dist = 2.6433505931 AU Mag: H = 8.16, G = 0.21 Epoch of elements : MJD 60638.69153808 TDT (2024 Nov 24.6915) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1112023Apr24,3.54,2024,11,24,16.596920,-0.000415,-0.005473,21.798954,2.207316,0.004239,0.000821,-0.000001,0.000000 -22.0125,-19.0163,-72.23,-20.74,False UCAC4 355-183731,19.38054242,-19.0629908,13.99,11.92,10.80,0.4,4,,19.40449028,-19.0162978,1.95,2.53,0,0,0 308,Polyxo,13.67,137.462,3.2170,0,0,4.202,6.04,,7.6,0 0,10.5246,2024,11,24,112.2345,181.5826,4.3626,0.03862,2.74953,2.64335,8.16,5.0,0.15 1.026,0.0073,0.0015,85,0.0015,Known errors,1.33,0,-1,-1 20241124_183731,60140.71 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 17:06 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org