IOTA/IOTA-ES occultation update for (5566) 1991 VY3 / UCAC4 389-136398 event on 2024 Nov 28, 12:24 UT Visible from Summary ------- On 2024 Nov 28 UT, the 13.894 km diameter asteroid (5566) 1991 VY3 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 8.05 mag to 19.12 mag (the magnitude of the asteroid) for at most 0.740 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: 99 * date and approx. time of event: 2024 Nov 28, 12:19 - 2024 Nov 28, 12:29 * geocentric midpoint of event [JD]: 2460643.01708995 * magnitude of target star: 11.07 * magnitude drop [mag]: 8.05 * estimated maximum duration [s]: 0.740 * Moon: 7 % sunlit, 113° distance * Sun: 82° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 17 * 1 sigma uncertainty interval [path widths]: +/- 0.25 * 1 sigma uncertainty interval [seconds]: +/- 2.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.016, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.017", 0.001", 71°) * approx speed of asteroid's shadow [km/s]: 18.8050 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 389-136398 by 5566 1991 VY3 on 2024 Nov 28 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 - 27 0 0 -52 10 40 12 19 55.4 1 109 56 -52 15 29 -52 5 50 -52 17 55 -52 3 25 .... - 26 0 0 -52 23 45 12 19 55.5 1 109 56 -52 28 34 -52 18 56 -52 30 59 -52 16 31 0.60 - 25 0 0 -52 36 31 12 19 55.6 2 108 56 -52 41 19 -52 31 43 -52 43 44 -52 29 18 0.63 - 24 0 0 -52 48 58 12 19 55.8 2 107 56 -52 53 46 -52 44 11 -52 56 11 -52 41 47 0.64 - 23 0 0 -53 1 7 12 19 56.0 3 106 56 -53 5 54 -52 56 20 -53 8 18 -52 53 56 0.65 - 22 0 0 -53 12 57 12 19 56.3 4 105 56 -53 17 43 -53 8 11 -53 20 7 -53 5 47 0.65 - 21 0 0 -53 24 28 12 19 56.6 4 105 56 -53 29 14 -53 19 42 -53 31 37 -53 17 19 0.66 - 20 0 0 -53 35 41 12 19 57.0 5 104 57 -53 40 26 -53 30 56 -53 42 49 -53 28 33 0.66 - 19 0 0 -53 46 35 12 19 57.4 6 103 57 -53 51 19 -53 41 50 -53 53 42 -53 39 28 0.66 - 18 0 0 -53 57 10 12 19 57.8 6 102 57 -54 1 54 -53 52 27 -54 4 17 -53 50 4 0.66 - 17 0 0 -54 7 27 12 19 58.3 7 101 57 -54 12 11 -54 2 44 -54 14 33 -54 0 22 0.66 - 16 0 0 -54 17 26 12 19 58.9 7 100 57 -54 22 9 -54 12 44 -54 24 31 -54 10 22 0.66 - 15 0 0 -54 27 7 12 19 59.5 8 100 57 -54 31 49 -54 22 25 -54 34 11 -54 20 4 0.67 - 14 0 0 -54 36 30 12 20 0.1 9 99 57 -54 41 11 -54 31 49 -54 43 33 -54 29 27 0.67 - 13 0 0 -54 45 35 12 20 0.8 9 98 56 -54 50 16 -54 40 54 -54 52 37 -54 38 33 0.67 - 12 0 0 -54 54 21 12 20 1.5 10 97 56 -54 59 2 -54 49 41 -55 1 23 -54 47 20 0.67 - 11 0 0 -55 2 50 12 20 2.2 10 96 56 -55 7 30 -54 58 10 -55 9 51 -54 55 50 0.67 - 10 0 0 -55 11 1 12 20 3.0 11 96 56 -55 15 40 -55 6 22 -55 18 1 -55 4 2 0.67 - 9 0 0 -55 18 54 12 20 3.8 12 95 56 -55 23 33 -55 14 16 -55 25 54 -55 11 56 0.67 - 8 0 0 -55 26 30 12 20 4.7 12 94 56 -55 31 9 -55 21 52 -55 33 29 -55 19 32 0.67 - 7 0 0 -55 33 48 12 20 5.6 13 93 56 -55 38 26 -55 29 10 -55 40 46 -55 26 51 0.67 - 6 0 0 -55 40 49 12 20 6.6 13 92 56 -55 45 27 -55 36 12 -55 47 46 -55 33 52 0.67 - 5 0 0 -55 47 32 12 20 7.5 14 91 56 -55 52 9 -55 42 56 -55 54 29 -55 40 36 0.67 - 4 0 0 -55 53 58 12 20 8.5 14 90 55 -55 58 35 -55 49 22 -56 0 54 -55 47 3 0.67 - 3 0 0 -56 0 7 12 20 9.6 15 90 55 -56 4 44 -55 55 31 -56 7 3 -55 53 13 0.67 - 2 0 0 -56 5 59 12 20 10.7 16 89 55 -56 10 35 -56 1 23 -56 12 54 -55 59 5 0.67 - 1 0 0 -56 11 34 12 20 11.8 16 88 55 -56 16 9 -56 6 59 -56 18 28 -56 4 40 0.67 0 0 0 -56 16 51 12 20 12.9 17 87 55 -56 21 27 -56 12 17 -56 23 45 -56 9 59 0.67 1 0 0 -56 21 52 12 20 14.1 17 86 54 -56 26 27 -56 17 18 -56 28 45 -56 15 0 0.67 2 0 0 -56 26 36 12 20 15.3 18 85 54 -56 31 11 -56 22 2 -56 33 29 -56 19 44 0.67 3 0 0 -56 31 3 12 20 16.6 18 84 54 -56 35 37 -56 26 29 -56 37 55 -56 24 12 0.67 4 0 0 -56 35 14 12 20 17.8 19 84 54 -56 39 47 -56 30 40 -56 42 5 -56 28 23 0.67 5 0 0 -56 39 7 12 20 19.2 19 83 53 -56 43 41 -56 34 34 -56 45 58 -56 32 17 0.67 6 0 0 -56 42 44 12 20 20.5 20 82 53 -56 47 17 -56 38 11 -56 49 35 -56 35 54 0.67 7 0 0 -56 46 5 12 20 21.9 21 81 53 -56 50 38 -56 41 32 -56 52 55 -56 39 15 0.67 8 0 0 -56 49 8 12 20 23.3 21 80 53 -56 53 41 -56 44 36 -56 55 58 -56 42 19 0.67 9 0 0 -56 51 56 12 20 24.7 22 79 52 -56 56 28 -56 47 23 -56 58 45 -56 45 7 0.67 10 0 0 -56 54 27 12 20 26.2 22 78 52 -56 58 59 -56 49 55 -57 1 16 -56 47 38 0.67 11 0 0 -56 56 41 12 20 27.7 23 77 52 -57 1 13 -56 52 9 -57 3 30 -56 49 52 0.67 12 0 0 -56 58 39 12 20 29.2 23 76 52 -57 3 11 -56 54 7 -57 5 28 -56 51 51 0.67 13 0 0 -57 0 21 12 20 30.8 24 75 51 -57 4 53 -56 55 49 -57 7 9 -56 53 33 0.67 14 0 0 -57 1 46 12 20 32.4 24 75 51 -57 6 18 -56 57 14 -57 8 34 -56 54 58 0.67 15 0 0 -57 2 55 12 20 34.0 25 74 51 -57 7 27 -56 58 23 -57 9 43 -56 56 7 0.67 16 0 0 -57 3 47 12 20 35.7 25 73 50 -57 8 19 -56 59 16 -57 10 36 -56 57 0 0.67 17 0 0 -57 4 24 12 20 37.4 26 72 50 -57 8 55 -56 59 52 -57 11 12 -56 57 36 0.67 18 0 0 -57 4 43 12 20 39.1 26 71 50 -57 9 15 -57 0 12 -57 11 32 -56 57 56 0.67 19 0 0 -57 4 47 12 20 40.9 27 70 49 -57 9 18 -57 0 16 -57 11 35 -56 57 59 0.67 20 0 0 -57 4 34 12 20 42.7 27 69 49 -57 9 6 -57 0 3 -57 11 22 -56 57 47 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17.4 1 258 -54 -14 24 15 -14 14 53 -14 26 36 -14 12 33 1.16 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 389-136398 * constellation : Aquarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 22 02 47.7408 DE: -12 18 41.522 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 22 02 47.7405 DE: -12 18 41.524 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.1 * B mag [mag]: 11.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (5566) 1991 VY3 asteroid class: approx. diameter [km]: 14 approx. diameter ["]: 0.006 distance from Earth [AU]: 3.33200 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#49 date of fit: 2022 Nov 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): 0.017", 0.001", 71.03° remarks: * orbital elements for (5566)1991 VY3 : Mean anomaly = 259.5913938039 deg Arg. of pericenter = 309.0778281668 deg Long. of node = 153.5966536446 deg Inclination = 1.5205097316 deg Eccentricity = 0.1568075091 Semimajor axis = 3.1793530963 AU Perihelion dist = 2.6808066567 AU Mag: H = 12.99, G = 0.15 Epoch of elements : MJD 60642.51708958 TDT (2024 Nov 28.5171) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#492022Nov25,0.74,2024,11,28,12.410159,0.188086,-0.525136,10.002473,3.550977,0.005627,0.002085,0.000000,0.000000 76.9827,-12.1921,-9.12,-21.44,False UCAC4 389-136398,22.04659469,-12.3115337,11.50,11.07,10.84,0.0,4,,22.06878497,-12.1921308,8.06,7.84,0,0,0 5566,1991 VY3,19.12,13.894,3.3320,0,0,1.801,9.38,,1.4,0 0,259.5015,2024,11,28,309.0778,153.5967,1.5205,0.15681,3.17935,2.68081,12.99,5.0,0.15 1.251,0.0170,0.0014,71,0.0015,Known errors,1.06,0,-1,-1 20241128_136398,60140.72 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 17:14 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org