IOTA/IOTA-ES occultation update for (454) Mathesis / UCAC4 302-136316 event on 2024 Sep 20, 16:05 UT Visible from Summary ------- On 2024 Sep 20 UT, the 81.8231174129983 km diameter asteroid (454) Mathesis will occult a 9.7 mag star in the constellation Ophiuchus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.66 mag to 14.34 mag (the magnitude of the asteroid) for at most 4.030 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 Sep 20, 16:00 - 2024 Sep 20, 16:11 * geocentric midpoint of event [JD]: 2460574.17078208 * magnitude of target star: 9.70 * magnitude drop [mag]: 4.66 * estimated maximum duration [s]: 4.030 * Moon: 90 % sunlit, 130° distance * Sun: 87° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 82 * 1 sigma uncertainty interval [path widths]: +/- 0.06 * 1 sigma uncertainty interval [seconds]: +/- 0.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.009, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.009", 0.002", 98°) * approx speed of asteroid's shadow [km/s]: 20.4135 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 302-136316 by 454 Mathesis on 2024 Sep 20 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 - 69 0 0 - 5 29 53 16 0 43.6 0 120 81 - 5 55 41 - 5 4 7 - 5 58 49 .. .. .. .... - 68 0 0 - 6 4 30 16 0 43.7 1 120 81 - 6 30 17 - 5 38 44 - 6 33 25 - 5 35 36 0.16 - 67 0 0 - 6 39 2 16 0 43.9 3 120 81 - 7 4 48 - 6 13 16 - 7 7 56 - 6 10 9 0.11 - 66 0 0 - 7 13 28 16 0 44.2 4 120 81 - 7 39 13 - 6 47 43 - 7 42 21 - 6 44 35 0.10 - 65 0 0 - 7 47 46 16 0 44.7 5 119 81 - 8 13 31 - 7 22 3 - 8 16 38 - 7 18 55 0.09 - 64 0 0 - 8 21 57 16 0 45.3 6 119 81 - 8 47 40 - 7 56 14 - 8 50 48 - 7 53 7 0.08 - 63 0 0 - 8 55 58 16 0 46.0 7 119 80 - 9 21 41 - 8 30 17 - 9 24 48 - 8 27 10 0.08 - 62 0 0 - 9 29 50 16 0 46.8 8 119 80 - 9 55 31 - 9 4 10 - 9 58 38 - 9 1 3 0.08 - 61 0 0 -10 3 30 16 0 47.8 9 119 79 -10 29 9 - 9 37 52 -10 32 16 - 9 34 45 0.08 - 60 0 0 -10 36 59 16 0 48.9 11 119 79 -11 2 36 -10 11 22 -11 5 43 -10 8 15 0.07 - 59 0 0 -11 10 14 16 0 50.1 12 118 78 -11 35 50 -10 44 39 -11 38 56 -10 41 33 0.07 - 58 0 0 -11 43 15 16 0 51.4 13 118 77 -12 8 49 -11 17 43 -12 11 55 -11 14 36 0.07 - 57 0 0 -12 16 2 16 0 52.8 14 118 76 -12 41 34 -11 50 31 -12 44 40 -11 47 25 0.07 - 56 0 0 -12 48 33 16 0 54.3 15 118 75 -13 14 2 -12 23 5 -13 17 8 -12 19 59 0.07 - 55 0 0 -13 20 48 16 0 56.0 16 118 74 -13 46 15 -12 55 22 -13 49 20 -12 52 16 0.07 - 54 0 0 -13 52 45 16 0 57.7 17 117 73 -14 18 9 -13 27 21 -14 21 14 -13 24 16 0.07 - 53 0 0 -14 24 24 16 0 59.6 18 117 73 -14 49 46 -13 59 3 -14 52 50 -13 55 58 0.07 - 52 0 0 -14 55 44 16 1 1.5 19 117 72 -15 21 3 -14 30 26 -15 24 8 -14 27 21 0.07 - 51 0 0 -15 26 44 16 1 3.6 21 117 71 -15 52 1 -15 1 29 -15 55 5 -14 58 25 0.07 - 50 0 0 -15 57 25 16 1 5.7 22 116 70 -16 22 38 -15 32 12 -16 25 42 -15 29 9 0.07 - 49 0 0 -16 27 44 16 1 8.0 23 116 69 -16 52 54 -16 2 34 -16 55 57 -15 59 31 0.07 - 48 0 0 -16 57 41 16 1 10.4 24 116 68 -17 22 48 -16 32 35 -17 25 51 -16 29 32 0.07 - 47 0 0 -17 27 16 16 1 12.8 25 115 67 -17 52 20 -17 2 13 -17 55 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Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 302-136316 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 34 45.3849 DE: -29 47 47.092 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 34 45.3848 DE: -29 47 47.092 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 9.7 * B mag [mag]: 10.8 * Diameter [mas]: 0.20 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (454) Mathesis asteroid class: approx. diameter [km]: 82 approx. diameter ["]: 0.047 distance from Earth [AU]: 2.39140 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): 0.009", 0.002", 98.435° remarks: * orbital elements for (454)Mathesis : Mean anomaly = 66.3860584229 deg Arg. of pericenter = 177.0990588087 deg Long. of node = 32.1662109902 deg Inclination = 6.2921976375 deg Eccentricity = 0.1116227542 Semimajor axis = 2.6275572709 AU Perihelion dist = 2.3342620914 AU Mag: H = 9.32, G = 0.15 Epoch of elements : MJD 60573.67078179 TDT (2024 Sep 20.6708) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1272023Apr24,4.03,2024,9,20,16.098770,0.002720,-0.051716,11.504085,0.641676,0.005561,-0.000266,0.000000,0.000000 22.5628,-29.8143,-63.18,0.72,False UCAC4 302-136316,17.57927362,-29.7964144,10.77,9.70,9.12,0.2,0,,17.60552056,-29.8143313,4.65,4.78,0,0,0 454,Mathesis,14.34,82.170,2.3914,0,0,3.251,2.36,,5.2,0 0,66.2308,2024,9,20,177.0991,32.1662,6.2922,0.11162,2.62756,2.33426,9.32,5.0,0.15 1.061,0.0087,0.0023,98,0.0029,Known errors,0.83,0,-1,-1 20240920_136316,60140.57 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 13:47 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org