IOTA/IOTA-ES occultation update for (454) Mathesis / UCAC4 303-153327 event on 2024 Oct 03, 20:52 UT Visible from Summary ------- On 2024 Oct 03 UT, the 81.862 km diameter asteroid (454) Mathesis will occult a 11.6 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.94 mag to 14.49 mag (the magnitude of the asteroid) for at most 3.270 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: 100 * date and approx. time of event: 2024 Oct 03, 20:48 - 2024 Oct 03, 20:57 * geocentric midpoint of event [JD]: 2460587.37013542 * magnitude of target star: 11.62 * magnitude drop [mag]: 2.94 * estimated maximum duration [s]: 3.270 * Moon: 1 % sunlit, 67° distance * Sun: 78° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 84 * 1 sigma uncertainty interval [path widths]: +/- 0.06 * 1 sigma uncertainty interval [seconds]: +/- 0.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.008, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.008", 0.002", 96°) * approx speed of asteroid's shadow [km/s]: 24.9984 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 303-153327 by 454 Mathesis on 2024 Oct 3 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 -142 0 0 7 36 20 20 48 50.5 0 120 76 7 10 10 8 2 34 7 7 7 .. .. .. .... -141 0 0 7 2 3 20 48 50.5 1 120 77 6 35 54 7 28 14 6 32 52 7 31 17 0.00 -140 0 0 6 27 53 20 48 50.7 3 120 78 6 1 47 6 54 2 5 58 44 6 57 5 -0.10 -139 0 0 5 53 52 20 48 51.0 4 120 79 5 27 48 6 20 0 5 24 46 6 23 2 -0.14 -138 0 0 5 20 1 20 48 51.4 5 120 80 4 53 59 5 46 6 4 50 58 5 49 9 -0.16 -137 0 0 4 46 22 20 48 51.9 6 120 81 4 20 22 5 12 24 4 17 21 5 15 26 -0.17 -136 0 0 4 12 54 20 48 52.5 7 121 81 3 46 57 4 38 54 3 43 55 4 41 56 -0.18 -135 0 0 3 39 39 20 48 53.1 8 121 82 3 13 44 4 5 36 3 10 43 4 8 38 -0.18 -134 0 0 3 6 38 20 48 53.9 9 121 82 2 40 46 3 32 32 2 37 45 3 35 33 -0.19 -133 0 0 2 33 51 20 48 54.8 11 121 83 2 8 2 2 59 43 2 5 2 3 2 44 -0.19 -132 0 0 2 1 21 20 48 55.8 12 121 83 1 35 35 2 27 9 1 32 35 2 30 10 -0.19 -131 0 0 1 29 7 20 48 56.9 13 121 83 1 3 24 1 54 52 1 0 24 1 57 52 -0.19 -130 0 0 0 57 10 20 48 58.1 14 121 83 0 31 30 1 22 52 0 28 31 1 25 52 -0.20 -129 0 0 0 25 32 20 48 59.4 15 121 82 - 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Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 303-153327 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 53 07.3529 DE: -29 33 54.186 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 53 07.3524 DE: -29 33 54.186 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.6 * B mag [mag]: 12.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (454) Mathesis asteroid class: approx. diameter [km]: 82 approx. diameter ["]: 0.044 distance from Earth [AU]: 2.57210 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#127 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): 0.008", 0.002", 96.186° remarks: * orbital elements for (454)Mathesis : Mean anomaly = 69.4455988130 deg Arg. of pericenter = 177.0939305101 deg Long. of node = 32.1659435416 deg Inclination = 6.2921911027 deg Eccentricity = 0.1116227663 Semimajor axis = 2.6275305702 AU Perihelion dist = 2.3342383395 AU Mag: H = 9.32, G = 0.15 Epoch of elements : MJD 60586.87013526 TDT (2024 Oct 03.8701) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1272023Apr24,3.27,2024,10,3,20.883250,-0.013497,0.219232,14.077751,0.950446,0.005555,-0.000181,0.000000,0.000000 -57.6235,-29.5720,-136.06,-4.41,False UCAC4 303-153327,17.88537583,-29.5650517,12.11,11.62,11.36,0.0,0,,17.91157353,-29.5719652,2.94,2.77,0,0,0 454,Mathesis,14.49,81.862,2.5721,0,0,3.689,3.25,,5.2,0 0,69.2442,2024,10,3,177.0939,32.1659,6.2922,0.11162,2.62753,2.33424,9.32,5.0,0.15 1.058,0.0080,0.0022,96,0.0026,Known errors,0.90,0,-1,-1 20241003_153327,60140.61 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 14:35 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org