IOTA/IOTA-ES occultation update for (417) Suevia / TYC 5689-00586-1 event on 2023 Jul 31, 16:13 UT Visible from Australia Summary ------- On 2023 Jul 31 UT, the 48.1 km diameter asteroid (417) Suevia will occult a 11.4 mag star in the constellation Serpens for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.64 mag to 13.96 mag (the magnitude of the asteroid) for at most 6.780 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: 99 * date and approx. time of event: 2023 Jul 31, 16:00 - 2023 Jul 31, 16:27 * geocentric midpoint of event [JD]: 2460157.17624975 * magnitude of target star: 11.42 * magnitude drop [mag]: 2.64 * estimated maximum duration [s]: 6.780 * Moon: 98 % sunlit, 24° distance * Sun: 146° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 54 * 1 sigma uncertainty interval [path widths]: +/- 0.17 * 1 sigma uncertainty interval [seconds]: +/- 3.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.018, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.019", 0.005", 81°) * approx speed of asteroid's shadow [km/s]: 7.0944 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5689-00586-1 by 417 Suevia on 2023 Jul 31 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 - 25 0 0 .. .. .... .. .. .. .. .. .. .. .. .. -46 25 3 .. .. .. -46 30 24 .... - 24 0 0 -46 24 20 16 27 1.9 1 109 16 -46 8 52 -46 39 50 -46 3 34 -46 45 10 .... - 23 0 0 -46 38 48 16 27 1.6 1 108 15 -46 23 22 -46 54 16 -46 18 4 -46 59 35 0.46 - 22 0 0 -46 52 55 16 27 1.2 2 108 14 -46 37 31 -47 8 21 -46 32 13 -47 13 40 0.48 - 21 0 0 -47 6 41 16 27 0.7 3 107 14 -46 51 19 -47 22 5 -46 46 2 -47 27 24 0.49 - 20 0 0 -47 20 6 16 26 59.9 4 106 13 -47 4 46 -47 35 29 -46 59 30 -47 40 47 0.49 - 19 0 0 -47 33 11 16 26 59.1 4 105 12 -47 17 53 -47 48 32 -47 12 37 -47 53 49 0.50 - 18 0 0 -47 45 56 16 26 58.0 5 105 12 -47 30 39 -48 1 15 -47 25 24 -48 6 31 0.50 - 17 0 0 -47 58 20 16 26 56.9 6 104 11 -47 43 5 -48 13 37 -47 37 51 -48 18 53 0.50 - 16 0 0 -48 10 24 16 26 55.6 6 103 11 -47 55 10 -48 25 39 -47 49 57 -48 30 55 0.50 - 15 0 0 -48 22 8 16 26 54.1 7 102 10 -48 6 56 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-10 30 47 0.55 170 0 0 - 9 52 16 16 0 43.1 8 258 -42 - 9 37 1 -10 7 33 - 9 31 47 -10 12 49 0.55 171 0 0 - 9 34 42 16 0 40.7 7 257 -41 - 9 19 29 - 9 49 58 - 9 14 15 - 9 55 13 0.56 172 0 0 - 9 17 31 16 0 38.6 6 257 -40 - 9 2 19 - 9 32 45 - 8 57 6 - 9 38 0 0.57 173 0 0 - 9 0 43 16 0 36.8 5 257 -39 - 8 45 32 - 9 15 55 - 8 40 20 - 9 21 9 0.58 174 0 0 - 8 44 18 16 0 35.4 4 257 -38 - 8 29 9 - 8 59 29 - 8 23 57 - 9 4 43 0.60 175 0 0 - 8 28 17 16 0 34.3 3 257 -37 - 8 13 9 - 8 43 27 - 8 7 58 - 8 48 40 0.62 176 0 0 - 8 12 40 16 0 33.4 2 257 -36 - 7 57 34 - 8 27 48 - 7 52 23 - 8 33 1 0.68 177 0 0 - 7 57 28 16 0 32.9 1 256 -35 - 7 42 23 - 8 12 35 - 7 37 12 - 8 17 47 0.85 178 0 0 - 7 42 40 16 0 32.8 0 256 -34 .. .. .. - 7 57 46 .. .. .. - 8 2 58 12.96 Uncertainty in time = +/- 4 secs Prediction of 2023 May 29.0 Data for the target star ------------------------ * name: TYC 5689-00586-1 * constellation : Serpens * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 19 57.6743 DE: -13 33 47.137 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 19 57.6742 DE: -13 33 47.137 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (417) Suevia asteroid class: approx. diameter [km]: 48 approx. diameter ["]: 0.035 distance from Earth [AU]: 1.90580 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#69 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): 0.019", 0.005", 80.6° remarks: * orbital elements for (417)Suevia : Mean anomaly = 82.9736479834 deg Arg. of pericenter = 348.3986477117 deg Long. of node = 199.4860226447 deg Inclination = 6.6478641153 deg Eccentricity = 0.1353742892 Semimajor axis = 2.7989660321 AU Perihelion dist = 2.4200579950 AU Mag: H = 9.61, G = 0.15 Epoch of elements : MJD 60156.67611111 TDT (2023 Jul 31.6761) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#692023Apr24,6.78,2023,7,31,16.229994,0.158634,-0.437942,-3.765330,-1.362590,0.003047,-0.000671,0.000001,0.000000 82.8492,-13.5528,-61.84,18.21,False TYC 5689-00586-1,18.33268732,-13.5630936,0.00,11.42,0.00,0.0,0,,18.35512368,-13.5528143,2.64,0.00,0,0,0 417,Suevia,13.96,48.1,1.9058,0,0,-1.190,-6.29,,2.4,0 0,82.8313,2023,7,31,348.3986,199.4860,6.6479,0.13537,2.79897,2.42006,9.61,5.0,0.15 1.172,0.0187,0.0050,81,0.0060,Known errors,-1.00,-1,-1,-1 20230731_0586-1,60092.99 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 May 28, 23:43 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org