IOTA/IOTA-ES occultation update for (681) Gorgo / UCAC4 404-061248 event on 2024 Sep 30, 16:18 UT Visible from Summary ------- On 2024 Sep 30 UT, the 21.4633762465622 km diameter asteroid (681) Gorgo will occult a 9.9 mag star in the constellation Libra for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.66 mag to 16.60 mag (the magnitude of the asteroid) for at most 0.570 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: 94 * date and approx. time of event: 2024 Sep 30, 16:15 - 2024 Sep 30, 16:21 * geocentric midpoint of event [JD]: 2460584.17929995 * magnitude of target star: 9.94 * magnitude drop [mag]: 6.66 * estimated maximum duration [s]: 0.570 * Moon: 4 % sunlit, 71° distance * Sun: 48° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 22 * 1 sigma uncertainty interval [path widths]: +/- 0.46 * 1 sigma uncertainty interval [seconds]: +/- 1.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.015", 0.003", 96°) * approx speed of asteroid's shadow [km/s]: 37.8237 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 404-061248 by 681 Gorgo on 2024 Sep 30 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 -107 0 0 6 48 30 16 15 25.1 0 99 48 6 42 27 6 54 33 6 36 50 7 0 9 .... -106 0 0 6 38 15 16 15 25.1 1 100 49 6 32 12 6 44 18 6 26 35 6 49 55 0.15 -105 0 0 6 27 42 16 15 25.2 2 100 50 6 21 39 6 33 46 6 16 1 6 39 23 0.15 -104 0 0 6 16 52 16 15 25.4 3 100 51 6 10 48 6 22 55 6 5 10 6 28 33 0.16 -103 0 0 6 5 43 16 15 25.6 4 100 52 5 59 39 6 11 47 5 54 0 6 17 25 0.16 -102 0 0 5 54 16 16 15 25.8 5 100 53 5 48 12 6 0 21 5 42 33 6 5 59 0.16 -101 0 0 5 42 32 16 15 26.2 7 100 54 5 36 27 5 48 37 5 30 49 5 54 16 0.16 -100 0 0 5 30 31 16 15 26.5 8 100 55 5 24 26 5 36 36 5 18 47 5 42 15 0.16 - 99 0 0 5 18 12 16 15 26.9 9 100 56 5 12 7 5 24 18 5 6 27 5 29 57 0.16 - 98 0 0 5 5 36 16 15 27.4 10 100 57 4 59 30 5 11 42 4 53 51 5 17 22 0.16 - 97 0 0 4 52 44 16 15 28.0 11 100 58 4 46 37 4 58 50 4 40 57 5 4 29 0.16 - 96 0 0 4 39 34 16 15 28.5 12 101 59 4 33 27 4 45 41 4 27 47 4 51 21 0.16 - 95 0 0 4 26 8 16 15 29.2 13 101 60 4 20 1 4 32 15 4 14 20 4 37 55 0.16 - 94 0 0 4 12 25 16 15 29.9 14 101 61 4 6 18 4 18 33 4 0 37 4 24 13 0.16 - 93 0 0 3 58 27 16 15 30.6 15 101 63 3 52 19 4 4 34 3 46 38 4 10 16 0.16 - 92 0 0 3 44 12 16 15 31.4 16 101 64 3 38 4 3 50 20 3 32 23 3 56 2 0.16 - 91 0 0 3 29 42 16 15 32.3 17 101 65 3 23 34 3 35 50 3 17 52 3 41 32 0.16 - 90 0 0 3 14 56 16 15 33.2 18 101 66 3 8 48 3 21 5 3 3 5 3 26 47 0.16 - 89 0 0 2 59 55 16 15 34.2 19 101 67 2 53 46 3 6 5 2 48 4 3 11 47 0.16 - 88 0 0 2 44 40 16 15 35.2 20 101 68 2 38 30 2 50 49 2 32 47 2 56 32 0.16 - 87 0 0 2 29 9 16 15 36.3 21 101 69 2 22 59 2 35 19 2 17 16 2 41 2 0.16 - 86 0 0 2 13 24 16 15 37.4 22 101 70 2 7 13 2 19 34 2 1 30 2 25 17 0.16 - 85 0 0 1 57 24 16 15 38.6 23 101 71 1 51 14 2 3 35 1 45 30 2 9 19 0.16 - 84 0 0 1 41 11 16 15 39.8 24 101 72 1 35 0 1 47 22 1 29 16 1 53 6 0.16 - 83 0 0 1 24 44 16 15 41.1 25 101 73 1 18 33 1 30 56 1 12 48 1 36 40 0.16 - 82 0 0 1 8 4 16 15 42.4 26 101 74 1 1 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43 -27 24 46 0.16 41 0 0 -27 36 14 16 20 35.0 30 275 -15 -27 42 11 -27 30 17 -27 47 43 -27 24 45 0.16 42 0 0 -27 35 55 16 20 36.3 29 275 -16 -27 41 53 -27 29 58 -27 47 24 -27 24 27 0.16 43 0 0 -27 35 19 16 20 37.6 28 274 -17 -27 41 16 -27 29 21 -27 46 48 -27 23 50 0.16 44 0 0 -27 34 24 16 20 38.8 27 274 -18 -27 40 21 -27 28 27 -27 45 53 -27 22 55 0.16 45 0 0 -27 33 11 16 20 40.0 27 273 -18 -27 39 8 -27 27 14 -27 44 40 -27 21 42 0.16 46 0 0 -27 31 40 16 20 41.2 26 273 -19 -27 37 37 -27 25 43 -27 43 9 -27 20 11 0.16 47 0 0 -27 29 51 16 20 42.3 25 272 -20 -27 35 49 -27 23 54 -27 41 21 -27 18 22 0.16 48 0 0 -27 27 44 16 20 43.4 24 272 -21 -27 33 42 -27 21 46 -27 39 14 -27 16 15 0.16 49 0 0 -27 25 19 16 20 44.5 23 271 -22 -27 31 17 -27 19 21 -27 36 49 -27 13 49 0.16 50 0 0 -27 22 36 16 20 45.5 22 271 -23 -27 28 34 -27 16 38 -27 34 6 -27 11 6 0.16 51 0 0 -27 19 35 16 20 46.5 21 270 -24 -27 25 33 -27 13 37 -27 31 5 -27 8 5 0.16 52 0 0 -27 16 16 16 20 47.4 20 270 -25 -27 22 14 -27 10 18 -27 27 46 -27 4 46 0.16 53 0 0 -27 12 39 16 20 48.3 19 269 -25 -27 18 37 -27 6 41 -27 24 10 -27 1 8 0.16 54 0 0 -27 8 44 16 20 49.2 18 269 -26 -27 14 42 -27 2 46 -27 20 15 -26 57 13 0.16 55 0 0 -27 4 31 16 20 50.0 18 268 -27 -27 10 30 -26 58 33 -27 16 3 -26 53 0 0.17 56 0 0 -27 0 1 16 20 50.8 17 268 -28 -27 5 59 -26 54 2 -27 11 32 -26 48 29 0.17 57 0 0 -26 55 12 16 20 51.6 16 267 -29 -27 1 11 -26 49 13 -27 6 44 -26 43 41 0.17 58 0 0 -26 50 6 16 20 52.3 15 267 -30 -26 56 5 -26 44 7 -27 1 39 -26 38 34 0.17 59 0 0 -26 44 42 16 20 52.9 14 266 -31 -26 50 42 -26 38 43 -26 56 15 -26 33 10 0.17 60 0 0 -26 39 1 16 20 53.6 13 266 -31 -26 45 0 -26 33 1 -26 50 34 -26 27 28 0.17 61 0 0 -26 33 1 16 20 54.2 12 266 -32 -26 39 1 -26 27 2 -26 44 35 -26 21 28 0.17 62 0 0 -26 26 44 16 20 54.7 11 265 -33 -26 32 44 -26 20 45 -26 38 19 -26 15 11 0.17 63 0 0 -26 20 10 16 20 55.2 10 265 -34 -26 26 10 -26 14 10 -26 31 45 -26 8 36 0.17 64 0 0 -26 13 18 16 20 55.7 9 264 -35 -26 19 18 -26 7 18 -26 24 53 -26 1 43 0.17 65 0 0 -26 6 9 16 20 56.1 9 264 -36 -26 12 9 -26 0 8 -26 17 44 -25 54 33 0.17 66 0 0 -25 58 42 16 20 56.5 8 263 -37 -26 4 43 -25 52 41 -26 10 18 -25 47 6 0.18 67 0 0 -25 50 58 16 20 56.8 7 263 -38 -25 56 59 -25 44 56 -26 2 34 -25 39 21 0.18 68 0 0 -25 42 56 16 20 57.1 6 262 -38 -25 48 58 -25 36 55 -25 54 33 -25 31 19 0.18 69 0 0 -25 34 37 16 20 57.4 5 262 -39 -25 40 39 -25 28 36 -25 46 15 -25 23 0 0.19 70 0 0 -25 26 2 16 20 57.6 4 262 -40 -25 32 4 -25 20 0 -25 37 40 -25 14 24 0.19 71 0 0 -25 17 9 16 20 57.8 3 261 -41 -25 23 11 -25 11 7 -25 28 48 -25 5 30 0.20 72 0 0 -25 7 59 16 20 57.9 2 261 -42 -25 14 2 -25 1 56 -25 19 38 -24 56 20 0.22 73 0 0 -24 58 32 16 20 58.0 1 260 -43 -25 4 35 -24 52 29 -25 10 12 -24 46 53 0.27 74 0 0 -24 48 49 16 20 58.0 0 260 -44 -24 54 52 -24 42 45 -25 0 29 -24 37 8 0.57 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 404-061248 * constellation : Libra * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 15 39 24.5427 DE: -09 16 57.897 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 15 39 24.5426 DE: -09 16 57.897 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 9.9 * B mag [mag]: 10.5 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (681) Gorgo asteroid class: approx. diameter [km]: 21 approx. diameter ["]: 0.009 distance from Earth [AU]: 3.44180 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#55 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): 0.015", 0.003", 96.111° remarks: * orbital elements for (681)Gorgo : Mean anomaly = 324.2160794259 deg Arg. of pericenter = 115.7362615409 deg Long. of node = 177.8293306169 deg Inclination = 12.5696057488 deg Eccentricity = 0.1001819541 Semimajor axis = 3.1091693837 AU Perihelion dist = 2.7976867192 AU Mag: H = 10.79, G = 0.15 Epoch of elements : MJD 60583.67929987 TDT (2024 Sep 30.6793) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#552023Apr24,0.57,2024,9,30,16.303199,-0.043464,-0.150520,20.527620,-5.864042,0.004286,-0.000319,-0.000001,0.000000 -19.2681,-9.3622,-67.11,-3.17,False UCAC4 404-061248,15.65681747,-9.2827493,10.53,9.94,9.62,0.1,0,,15.67888719,-9.3622021,6.66,6.53,0,0,0 681,Gorgo,16.60,21.713,3.4418,0,0,3.544,-14.98,,2.2,0 0,324.0940,2024,9,30,115.7363,177.8293,12.5696,0.10018,3.10917,2.79769,10.79,5.0,0.15 1.464,0.0150,0.0032,96,0.0040,Known errors,0.91,0,-1,-1 20240930_061248,60140.60 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 14:23 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org