IOTA/IOTA-ES occultation update for (2604) Marshak / TYC 6975-00616-1 event on 2024 Oct 07, 11:18 UT Visible from Summary ------- On 2024 Oct 07 UT, the 14.934 km diameter asteroid (2604) Marshak will occult a 11.0 mag star in the constellation Sculptor for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.64 mag to 16.65 mag (the magnitude of the asteroid) for at most 3.060 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 07, 10:58 - 2024 Oct 07, 11:38 * geocentric midpoint of event [JD]: 2460590.97108096 * magnitude of target star: 11.02 * magnitude drop [mag]: 5.64 * estimated maximum duration [s]: 3.060 * Moon: 19 % sunlit, 91° distance * Sun: 141° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 17 * 1 sigma uncertainty interval [path widths]: +/- 0.34 * 1 sigma uncertainty interval [seconds]: +/- 6.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.030, +/- 0.008) * 1 sigma uncertainty ellipse (major, minor, PA): (0.030", 0.003", 77°) * approx speed of asteroid's shadow [km/s]: 4.8820 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6975-00616-1 by 2604 Marshak on 2024 Oct 7 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 52 0 0 -30 31 8 11 37 39.1 0 119 37 -30 25 59 -30 36 17 -30 22 28 -30 39 48 .... 53 0 0 -31 0 28 11 37 38.7 1 119 36 -30 55 19 -31 5 38 -30 51 49 -31 9 9 0.44 54 0 0 -31 29 37 11 37 37.8 2 118 36 -31 24 28 -31 34 46 -31 20 58 -31 38 17 0.46 55 0 0 -31 58 33 11 37 36.5 3 118 35 -31 53 24 -32 3 42 -31 49 54 -32 7 13 0.46 56 0 0 -32 27 16 11 37 34.8 4 117 34 -32 22 7 -32 32 25 -32 18 37 -32 35 55 0.47 57 0 0 -32 55 45 11 37 32.6 5 117 33 -32 50 36 -33 0 53 -32 47 6 -33 4 24 0.47 58 0 0 -33 23 59 11 37 30.1 6 116 32 -33 18 51 -33 29 8 -33 15 21 -33 32 38 0.47 59 0 0 -33 51 59 11 37 27.2 7 116 31 -33 46 51 -33 57 7 -33 43 21 -34 0 38 0.47 60 0 0 -34 19 43 11 37 24.0 8 115 30 -34 14 35 -34 24 51 -34 11 6 -34 28 21 0.47 61 0 0 -34 47 11 11 37 20.3 9 114 29 -34 42 4 -34 52 19 -34 38 34 -34 55 49 0.48 62 0 0 -35 14 23 11 37 16.3 10 114 28 -35 9 16 -35 19 30 -35 5 46 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35 0.52 -103 0 0 -24 5 35 10 59 26.8 10 247 -20 -24 0 29 -24 10 40 -23 57 1 -24 14 8 0.52 -102 0 0 -23 36 8 10 59 22.4 9 246 -19 -23 31 3 -23 41 13 -23 27 35 -23 44 41 0.52 -101 0 0 -23 6 42 10 59 18.5 8 246 -19 -23 1 37 -23 11 47 -22 58 10 -23 15 15 0.53 -100 0 0 -22 37 17 10 59 15.1 7 246 -18 -22 32 13 -22 42 22 -22 28 46 -22 45 49 0.54 - 99 0 0 -22 7 55 10 59 12.1 6 245 -17 -22 2 51 -22 12 59 -21 59 24 -22 16 27 0.55 - 98 0 0 -21 38 36 10 59 9.6 5 245 -16 -21 33 32 -21 43 40 -21 30 5 -21 47 7 0.57 - 97 0 0 -21 9 21 10 59 7.6 4 244 -16 -21 4 17 -21 14 24 -21 0 51 -21 17 51 0.59 - 96 0 0 -20 40 10 10 59 6.0 3 244 -15 -20 35 7 -20 45 13 -20 31 41 -20 48 40 0.63 - 95 0 0 -20 11 6 10 59 5.0 2 244 -14 -20 6 3 -20 16 8 -20 2 37 -20 19 35 0.73 - 94 0 0 -19 42 8 10 59 4.4 1 243 -13 -19 37 6 -19 47 10 -19 33 40 -19 50 36 1.18 Uncertainty in time = +/- 7 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: TYC 6975-00616-1 * constellation : Sculptor * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 23 12 22.4060 DE: -25 21 19.440 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 23 12 22.4059 DE: -25 21 19.442 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.300) * V mag [mag]: 11.0 * B mag [mag]: 11.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2604) Marshak asteroid class: approx. diameter [km]: 15 approx. diameter ["]: 0.014 distance from Earth [AU]: 1.46520 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#52 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): 0.030", 0.003", 76.783° remarks: * orbital elements for (2604)Marshak : Mean anomaly = 70.3570795855 deg Arg. of pericenter = 134.4606179750 deg Long. of node = 122.9391152503 deg Inclination = 14.8416941585 deg Eccentricity = 0.2329332226 Semimajor axis = 2.3870208410 AU Perihelion dist = 1.8310043841 AU Mag: H = 13.13, G = 0.15 Epoch of elements : MJD 60590.47108117 TDT (2024 Oct 07.4711) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#522023Apr24,3.06,2024,10,7,11.305943,0.049637,-0.460066,-2.739814,-0.293972,0.002370,0.002654,0.000001,0.000000 162.2429,-25.2203,7.34,-5.79,False TYC 6975-00616-1,23.20622390,-25.3553998,11.32,11.02,10.86,0.0,0,,23.22863385,-25.2203437,5.64,5.35,0,0,0 2604,Marshak,16.65,14.934,1.4652,0,0,-1.211,-1.75,,2.8,0 0,70.2312,2024,10,7,134.4606,122.9391,14.8417,0.23293,2.38702,1.83100,13.13,5.0,0.15 1.341,0.0303,0.0030,77,0.0048,Known errors,1.65,0,-1,-1 20241007_0616-1,60140.62 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 14:48 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org