IOTA/IOTA-ES occultation update for (5591) Koyo / UCAC4 538-021861 event on 2024 Feb 05, 19:38 UT Visible from Summary ------- On 2024 Feb 05 UT, the 16.4338387684029 km diameter asteroid (5591) Koyo will occult a 9.0 mag star in the constellation Orion for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 8.93 mag to 17.89 mag (the magnitude of the asteroid) for at most 4.540 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: 70 * date and approx. time of event: 2024 Feb 05, 19:15 - 2024 Feb 05, 20:01 * geocentric midpoint of event [JD]: 2460346.31835792 * magnitude of target star: 8.96 * magnitude drop [mag]: 8.93 * estimated maximum duration [s]: 4.540 * Moon: 22 % sunlit, 166° distance * Sun: 133° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 22 * 1 sigma uncertainty interval [path widths]: +/- 0.84 * 1 sigma uncertainty interval [seconds]: +/- 5.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.017, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.017", 0.003", 89°) * approx speed of asteroid's shadow [km/s]: 3.6511 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 538-021861 by 5591 Koyo on 2024 Feb 5 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 - 73 0 0 - 8 5 39 20 0 37.6 0 72 47 - 7 59 18 - 8 12 1 - 7 48 39 - 8 22 43 .... - 72 0 0 - 7 47 11 20 0 37.0 1 72 46 - 7 40 52 - 7 53 30 - 7 30 16 - 8 4 10 0.46 - 71 0 0 - 7 29 36 20 0 35.7 2 72 45 - 7 23 19 - 7 35 54 - 7 12 47 - 7 46 30 0.65 - 70 0 0 - 7 12 54 20 0 33.7 3 72 44 - 7 6 39 - 7 19 10 - 6 56 10 - 7 29 43 0.73 - 69 0 0 - 6 57 5 20 0 30.9 4 72 43 - 6 50 51 - 7 3 19 - 6 40 25 - 7 13 49 0.77 - 68 0 0 - 6 42 7 20 0 27.5 5 72 42 - 6 35 55 - 6 48 19 - 6 25 31 - 6 58 46 0.79 - 67 0 0 - 6 27 59 20 0 23.3 6 71 41 - 6 21 49 - 6 34 10 - 6 11 28 - 6 44 35 0.81 - 66 0 0 - 6 14 43 20 0 18.5 7 71 40 - 6 8 34 - 6 20 52 - 5 58 16 - 6 31 14 0.82 - 65 0 0 - 6 2 16 20 0 13.1 8 71 39 - 5 56 8 - 6 8 24 - 5 45 53 - 6 18 43 0.82 - 64 0 0 - 5 50 38 20 0 7.0 9 71 38 - 5 44 32 - 5 56 45 - 5 34 19 - 6 7 2 0.83 - 63 0 0 - 5 39 49 20 0 0.2 10 71 37 - 5 33 45 - 5 45 55 - 5 23 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.... .. .. .. .. .. .. .. .. .. .. .. .. -65 14 41 .. .. .. .... Uncertainty in time = +/- 7 secs Prediction of 2023 Jul 13.2 Data for the target star ------------------------ * name: UCAC4 538-021861 * constellation : Orion * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 05 57 33.8898 DE: +17 34 51.137 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 05 57 33.8897 DE: +17 34 51.137 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 9.0 * B mag [mag]: 9.0 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (5591) Koyo asteroid class: approx. diameter [km]: 16 approx. diameter ["]: 0.011 distance from Earth [AU]: 1.97390 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#47 date of fit: 2023 Apr 27 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", 0.003", 89.344° remarks: * orbital elements for (5591)Koyo : Mean anomaly = 76.4751197046 deg Arg. of pericenter = 190.1725397497 deg Long. of node = 188.0467736878 deg Inclination = 4.2410022017 deg Eccentricity = 0.0872582036 Semimajor axis = 2.7787720167 AU Perihelion dist = 2.5363013622 AU Mag: H = 13.38, G = 0.15 Epoch of elements : MJD 60345.81835963 TDT (2024 Feb 05.8184) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#472023Apr27,4.54,2024,2,5,19.640590,-0.342117,-0.550822,-1.750192,1.087954,0.004297,0.000427,0.000001,0.000000 19.6808,17.5838,-111.12,-15.89,False UCAC4 538-021861,5.95941386,17.5808714,9.01,8.96,8.93,0.1,0,,5.98302713,17.5838381,8.93,8.51,0,0,0 5591,Koyo,17.89,16.577,1.9739,0,0,-0.544,4.85,,1.4,0 0,76.3010,2024,2,5,190.1725,188.0468,4.2410,0.08726,2.77877,2.53630,13.38,5.0,0.15 1.840,0.0173,0.0030,89,0.0097,Known errors,0.92,0,-1,-1 20240205_021861,60138.16 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 13, 03:44 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org