IOTA/IOTA-ES occultation update for (1878) Hughes / UCAC4 369-180445 event on 2024 Oct 26, 09:13 UT Visible from Summary ------- On 2024 Oct 26 UT, the 12.3154406479642 km diameter asteroid (1878) Hughes will occult a 9.7 mag star in the constellation Capricornus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 7.55 mag to 17.20 mag (the magnitude of the asteroid) for at most 1.070 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 Oct 26, 09:05 - 2024 Oct 26, 09:21 * geocentric midpoint of event [JD]: 2460609.88445284 * magnitude of target star: 9.65 * magnitude drop [mag]: 7.55 * estimated maximum duration [s]: 1.070 * Moon: 31 % sunlit, 164° distance * Sun: 98° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 14 * 1 sigma uncertainty interval [path widths]: +/- 0.36 * 1 sigma uncertainty interval [seconds]: +/- 1.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.011, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.011", 0.003", 74°) * approx speed of asteroid's shadow [km/s]: 12.7698 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 369-180445 by 1878 Hughes on 2024 Oct 26 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 45 0 0 -24 25 4 9 5 31.3 1 108 77 -24 29 4 -24 21 5 -24 31 58 -24 18 11 .... 46 0 0 -24 42 32 9 5 31.5 2 107 77 -24 46 31 -24 38 32 -24 49 25 -24 35 39 0.24 47 0 0 -24 59 45 9 5 31.8 3 107 76 -25 3 44 -24 55 46 -25 6 38 -24 52 53 0.25 48 0 0 -25 16 45 9 5 32.3 4 106 75 -25 20 44 -25 12 46 -25 23 37 -25 9 53 0.25 49 0 0 -25 33 30 9 5 32.9 4 106 74 -25 37 29 -25 29 32 -25 40 22 -25 26 38 0.25 50 0 0 -25 50 1 9 5 33.6 5 105 74 -25 54 0 -25 46 3 -25 56 53 -25 43 10 0.25 51 0 0 -26 6 17 9 5 34.5 6 105 73 -26 10 15 -26 2 19 -26 13 8 -25 59 26 0.25 52 0 0 -26 22 18 9 5 35.5 7 105 72 -26 26 16 -26 18 21 -26 29 9 -26 15 28 0.25 53 0 0 -26 38 4 9 5 36.7 8 104 71 -26 42 2 -26 34 7 -26 44 55 -26 31 15 0.25 54 0 0 -26 53 35 9 5 37.9 9 104 70 -26 57 32 -26 49 38 -27 0 25 -26 46 46 0.25 55 0 0 -27 8 50 9 5 39.3 10 103 70 -27 12 47 -27 4 53 -27 15 39 -27 2 1 0.25 56 0 0 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secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 369-180445 * constellation : Capricornus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 52 07.0622 DE: -16 20 21.607 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 52 07.0622 DE: -16 20 21.607 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 9.7 * B mag [mag]: 11.4 * Diameter [mas]: 0.70 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1878) Hughes asteroid class: approx. diameter [km]: 12 approx. diameter ["]: 0.007 distance from Earth [AU]: 2.56960 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#49 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): 0.011", 0.003", 73.802° remarks: * orbital elements for (1878)Hughes : Mean anomaly = 208.6195474528 deg Arg. of pericenter = 295.2692325858 deg Long. of node = 187.7588184938 deg Inclination = 1.7832914276 deg Eccentricity = 0.0135156494 Semimajor axis = 2.8445509476 AU Perihelion dist = 2.8061049943 AU Mag: H = 11.86, G = 0.15 Epoch of elements : MJD 60609.38445229 TDT (2024 Oct 26.3845) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#492023Apr24,1.07,2024,10,26,9.226868,0.046900,-0.227803,7.058461,1.458743,0.005585,0.001566,0.000000,0.000000 139.7348,-16.2465,37.58,-12.67,False UCAC4 369-180445,20.86862841,-16.3393351,11.42,9.65,8.69,0.7,4,,20.89182178,-16.2465228,7.56,8.06,0,0,0 1878,Hughes,17.20,13.620,2.5696,0,0,1.678,4.99,,1.0,0 0,208.5406,2024,10,26,295.2692,187.7588,1.7833,0.01352,2.84455,2.80610,11.86,5.0,0.15 1.363,0.0113,0.0025,74,0.0027,Known errors,1.04,0,-1,-1 20241026_180445,60140.66 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:50 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org