IOTA/IOTA-ES occultation update for (4708) Polydoros / UCAC4 435-119296 event on 2024 Dec 31, 17:17 UT Visible from Summary ------- On 2024 Dec 31 UT, the 55.191 km diameter asteroid (4708) Polydoros will occult a 11.1 mag star in the constellation Aquarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.87 mag to 17.93 mag (the magnitude of the asteroid) for at most 1.870 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: 98 * date and approx. time of event: 2024 Dec 31, 17:13 - 2024 Dec 31, 17:20 * geocentric midpoint of event [JD]: 2460676.22037537 * magnitude of target star: 11.06 * magnitude drop [mag]: 6.87 * estimated maximum duration [s]: 1.870 * Moon: 1 % sunlit, 50° distance * Sun: 58° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 59 * 1 sigma uncertainty interval [path widths]: +/- 0.34 * 1 sigma uncertainty interval [seconds]: +/- 3.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.024, +/- 0.012) * 1 sigma uncertainty ellipse (major, minor, PA): (0.027", 0.003", 64°) * approx speed of asteroid's shadow [km/s]: 29.5254 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 435-119296 by 4708 Polydoros on 2024 Dec 31 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 -39 51 26 17 13 59.6 1 93 56 -40 7 31 -39 35 23 -40 18 32 -39 24 25 .... -112 0 0 -39 54 12 17 13 59.6 1 93 56 -40 10 16 -39 38 9 -40 21 17 -39 27 11 0.29 -111 0 0 -39 56 41 17 13 59.7 2 92 57 -40 12 45 -39 40 38 -40 23 46 -39 29 41 0.33 -110 0 0 -39 58 54 17 13 59.8 3 91 58 -40 14 57 -39 42 52 -40 25 58 -39 31 54 0.34 -109 0 0 -40 0 50 17 14 0.0 4 91 59 -40 16 53 -39 44 48 -40 27 53 -39 33 51 0.35 -108 0 0 -40 2 29 17 14 0.2 4 90 59 -40 18 33 -39 46 28 -40 29 33 -39 35 31 0.36 -107 0 0 -40 3 52 17 14 0.5 5 90 60 -40 19 56 -39 47 51 -40 30 55 -39 36 54 0.36 -106 0 0 -40 4 59 17 14 0.8 6 89 61 -40 21 2 -39 48 58 -40 32 2 -39 38 1 0.37 -105 0 0 -40 5 49 17 14 1.1 7 88 61 -40 21 52 -39 49 48 -40 32 51 -39 38 51 0.37 -104 0 0 -40 6 22 17 14 1.5 7 88 62 -40 22 25 -39 50 21 -40 33 25 -39 39 25 0.37 -103 0 0 -40 6 39 17 14 1.9 8 87 63 -40 22 42 -39 50 38 -40 33 41 -39 39 42 0.37 -102 0 0 -40 6 39 17 14 2.4 9 86 63 -40 22 42 -39 50 39 -40 33 42 -39 39 42 0.37 -101 0 0 -40 6 23 17 14 2.9 10 86 64 -40 22 26 -39 50 22 -40 33 25 -39 39 26 0.37 -100 0 0 -40 5 50 17 14 3.4 10 85 65 -40 21 53 -39 49 49 -40 32 52 -39 38 53 0.38 - 99 0 0 -40 5 0 17 14 4.0 11 84 65 -40 21 3 -39 48 59 -40 32 3 -39 38 3 0.38 - 98 0 0 -40 3 54 17 14 4.7 12 84 66 -40 19 57 -39 47 53 -40 30 57 -39 36 57 0.38 - 97 0 0 -40 2 31 17 14 5.3 13 83 66 -40 18 34 -39 46 30 -40 29 34 -39 35 33 0.38 - 96 0 0 -40 0 52 17 14 6.0 14 82 67 -40 16 55 -39 44 50 -40 27 55 -39 33 54 0.38 - 95 0 0 -39 58 56 17 14 6.8 14 82 68 -40 14 59 -39 42 54 -40 25 59 -39 31 57 0.38 - 94 0 0 -39 56 43 17 14 7.6 15 81 68 -40 12 47 -39 40 41 -40 23 47 -39 29 44 0.38 - 93 0 0 -39 54 13 17 14 8.4 16 80 69 -40 10 17 -39 38 11 -40 21 18 -39 27 14 0.38 - 92 0 0 -39 51 27 17 14 9.3 17 80 69 -40 7 32 -39 35 25 -40 18 32 -39 24 27 0.38 - 91 0 0 -39 48 24 17 14 10.2 17 79 70 -40 4 29 -39 32 22 -40 15 30 -39 21 24 0.38 - 90 0 0 -39 45 5 17 14 11.2 18 78 70 -40 1 10 -39 29 2 -40 12 11 -39 18 4 0.38 - 89 0 0 -39 41 29 17 14 12.2 19 78 71 -39 57 34 -39 25 25 -40 8 36 -39 14 27 0.38 - 88 0 0 -39 37 36 17 14 13.2 20 77 71 -39 53 42 -39 21 32 -40 4 44 -39 10 33 0.38 - 87 0 0 -39 33 26 17 14 14.3 20 76 72 -39 49 33 -39 17 21 -40 0 35 -39 6 22 0.38 - 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7 10 1 17 20 9.6 30 271 -21 - 7 26 31 - 6 53 33 - 7 37 50 - 6 42 18 0.40 38 0 0 - 6 56 51 17 20 11.7 29 271 -22 - 7 13 20 - 6 40 24 - 7 24 38 - 6 29 10 0.40 39 0 0 - 6 43 59 17 20 13.7 28 270 -23 - 7 0 27 - 6 27 33 - 7 11 44 - 6 16 19 0.40 40 0 0 - 6 31 25 17 20 15.6 27 270 -24 - 6 47 52 - 6 15 0 - 6 59 8 - 6 3 48 0.40 41 0 0 - 6 19 10 17 20 17.5 26 270 -25 - 6 35 36 - 6 2 46 - 6 46 51 - 5 51 34 0.40 42 0 0 - 6 7 14 17 20 19.3 25 270 -26 - 6 23 39 - 5 50 51 - 6 34 54 - 5 39 40 0.40 43 0 0 - 5 55 37 17 20 21.0 24 269 -27 - 6 12 1 - 5 39 15 - 6 23 15 - 5 28 5 0.40 44 0 0 - 5 44 20 17 20 22.7 23 269 -28 - 6 0 42 - 5 27 59 - 6 11 56 - 5 16 49 0.40 45 0 0 - 5 33 21 17 20 24.3 22 269 -29 - 5 49 43 - 5 17 1 - 6 0 56 - 5 5 52 0.40 46 0 0 - 5 22 43 17 20 25.8 21 269 -30 - 5 39 4 - 5 6 24 - 5 50 16 - 4 55 15 0.40 47 0 0 - 5 12 24 17 20 27.3 20 269 -30 - 5 28 44 - 4 56 6 - 5 39 55 - 4 44 58 0.41 48 0 0 - 5 2 25 17 20 28.7 19 269 -31 - 5 18 44 - 4 46 8 - 5 29 55 - 4 35 1 0.41 49 0 0 - 4 52 46 17 20 30.0 18 269 -32 - 5 9 4 - 4 36 30 - 5 20 14 - 4 25 23 0.41 50 0 0 - 4 43 28 17 20 31.2 17 268 -33 - 4 59 45 - 4 27 12 - 5 10 54 - 4 16 6 0.41 51 0 0 - 4 34 29 17 20 32.4 16 268 -34 - 4 50 46 - 4 18 15 - 5 1 55 - 4 7 9 0.41 52 0 0 - 4 25 51 17 20 33.5 15 268 -35 - 4 42 7 - 4 9 38 - 4 53 15 - 3 58 32 0.41 53 0 0 - 4 17 34 17 20 34.6 14 268 -36 - 4 33 49 - 4 1 21 - 4 44 57 - 3 50 16 0.41 54 0 0 - 4 9 37 17 20 35.5 13 268 -37 - 4 25 51 - 3 53 25 - 4 36 59 - 3 42 21 0.41 55 0 0 - 4 2 1 17 20 36.5 12 268 -38 - 4 18 15 - 3 45 50 - 4 29 21 - 3 34 46 0.41 56 0 0 - 3 54 46 17 20 37.3 11 268 -39 - 4 10 59 - 3 38 35 - 4 22 5 - 3 27 32 0.41 57 0 0 - 3 47 52 17 20 38.0 10 268 -40 - 4 4 4 - 3 31 42 - 4 15 10 - 3 20 39 0.42 58 0 0 - 3 41 19 17 20 38.7 9 268 -41 - 3 57 30 - 3 25 9 - 4 8 36 - 3 14 7 0.42 59 0 0 - 3 35 7 17 20 39.4 8 268 -41 - 3 51 18 - 3 18 58 - 4 2 23 - 3 7 56 0.42 60 0 0 - 3 29 16 17 20 39.9 7 267 -42 - 3 45 26 - 3 13 8 - 3 56 31 - 3 2 6 0.42 61 0 0 - 3 23 46 17 20 40.4 6 267 -43 - 3 39 56 - 3 7 39 - 3 51 0 - 2 56 38 0.43 62 0 0 - 3 18 38 17 20 40.8 5 267 -44 - 3 34 47 - 3 2 31 - 3 45 51 - 2 51 30 0.44 63 0 0 - 3 13 51 17 20 41.1 4 267 -45 - 3 29 59 - 2 57 44 - 3 41 3 - 2 46 44 0.44 64 0 0 - 3 9 25 17 20 41.4 3 267 -46 - 3 25 33 - 2 53 19 - 3 36 37 - 2 42 19 0.46 65 0 0 - 3 5 21 17 20 41.6 2 267 -47 - 3 21 29 - 2 49 15 - 3 32 32 - 2 38 15 0.49 66 0 0 - 3 1 38 17 20 41.7 1 267 -47 - 3 17 45 - 2 45 33 - 3 28 48 - 2 34 33 0.57 67 0 0 - 2 58 17 17 20 41.8 0 267 -48 - 3 14 24 - 2 42 11 - 3 25 26 - 2 31 12 1.32 Uncertainty in time = +/- 4 secs Prediction of 2023 Jul 15.8 Data for the target star ------------------------ * name: UCAC4 435-119296 * constellation : Aquarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 22 30 14.8617 DE: -03 03 35.024 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 22 30 14.8617 DE: -03 03 35.025 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.400,0.400) * V mag [mag]: 11.1 * B mag [mag]: 11.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4708) Polydoros asteroid class: approx. diameter [km]: 55 approx. diameter ["]: 0.014 distance from Earth [AU]: 5.42790 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#46 date of fit: 2023 Apr 25 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): 0.027", 0.003", 64.083° remarks: * orbital elements for (4708)Polydoros : Mean anomaly = 326.4263192632 deg Arg. of pericenter = 104.4871269272 deg Long. of node = 281.1643459542 deg Inclination = 6.9919044206 deg Eccentricity = 0.0609335548 Semimajor axis = 5.2384561466 AU Perihelion dist = 4.9192583920 AU Mag: H = 10.14, G = 0.15 Epoch of elements : MJD 60675.72037500 TDT (2024 Dec 31.7204) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#462023Apr25,1.87,2024,12,31,17.289009,0.114141,-0.344932,15.816488,5.249716,0.004762,0.002268,-0.000001,0.000000 -22.0770,-2.9325,-78.50,-23.02,False UCAC4 435-119296,22.50412828,-3.0597288,11.62,11.06,10.76,0.0,0,,22.52547309,-2.9324891,6.87,6.73,0,0,0 4708,Polydoros,17.93,55.191,5.4279,0,0,1.711,8.51,,5.4,0 0,326.3671,2024,12,31,104.4871,281.1643,6.9919,0.06093,5.23846,4.91926,10.14,5.0,0.15 1.342,0.0267,0.0033,64,0.0048,Known errors,2.19,0,-1,-1 20241231_119296,60140.76 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 18:18 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org