IOTA/IOTA-ES occultation update for (548) Kressida / TYC 6876-00746-1 event on 2024 Oct 18, 16:01 UT Visible from Summary ------- On 2024 Oct 18 UT, the 14.5588711854176 km diameter asteroid (548) Kressida will occult a 10.1 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 5.93 mag to 16.07 mag (the magnitude of the asteroid) for at most 0.790 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 18, 15:55 - 2024 Oct 18, 16:06 * geocentric midpoint of event [JD]: 2460602.16753130 * magnitude of target star: 10.14 * magnitude drop [mag]: 5.93 * estimated maximum duration [s]: 0.790 * Moon: 98 % sunlit, 113° distance * Sun: 85° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 15 * 1 sigma uncertainty interval [path widths]: +/- 0.37 * 1 sigma uncertainty interval [seconds]: +/- 0.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.010, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.010", 0.003", 84°) * approx speed of asteroid's shadow [km/s]: 18.7290 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6876-00746-1 by 548 Kressida on 2024 Oct 18 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 - 71 0 0 -17 7 46 15 55 40.4 1 115 79 -17 12 15 -17 3 17 -17 15 36 -16 59 55 .... - 70 0 0 -17 34 15 15 55 40.6 2 114 80 -17 38 44 -17 29 47 -17 42 6 -17 26 25 0.22 - 69 0 0 -18 0 35 15 55 40.8 3 114 80 -18 5 4 -17 56 6 -18 8 25 -17 52 45 0.22 - 68 0 0 -18 26 44 15 55 41.2 4 114 80 -18 31 12 -18 22 15 -18 34 33 -18 18 54 0.21 - 67 0 0 -18 52 41 15 55 41.7 5 113 80 -18 57 9 -18 48 13 -19 0 30 -18 44 52 0.21 - 66 0 0 -19 18 26 15 55 42.3 6 113 80 -19 22 54 -19 13 58 -19 26 14 -19 10 37 0.21 - 65 0 0 -19 43 58 15 55 43.1 7 113 80 -19 48 26 -19 39 30 -19 51 46 -19 36 10 0.21 - 64 0 0 -20 9 17 15 55 43.9 8 112 80 -20 13 44 -20 4 50 -20 17 5 -20 1 30 0.21 - 63 0 0 -20 34 22 15 55 44.8 9 112 79 -20 38 49 -20 29 55 -20 42 9 -20 26 35 0.21 - 62 0 0 -20 59 13 15 55 45.9 10 112 79 -21 3 40 -20 54 46 -21 7 0 -20 51 27 0.21 - 61 0 0 -21 23 49 15 55 47.0 11 111 78 -21 28 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248 -65 -10 20 14 -10 11 13 -10 23 36 -10 7 50 0.22 100 0 0 - 9 47 35 16 6 36.1 16 248 -66 - 9 52 5 - 9 43 4 - 9 55 28 - 9 39 42 0.22 101 0 0 - 9 19 28 16 6 37.9 15 248 -66 - 9 23 58 - 9 14 57 - 9 27 20 - 9 11 35 0.22 102 0 0 - 8 51 23 16 6 39.5 14 248 -67 - 8 55 53 - 8 46 53 - 8 59 15 - 8 43 31 0.22 103 0 0 - 8 23 21 16 6 41.0 12 247 -68 - 8 27 51 - 8 18 51 - 8 31 14 - 8 15 29 0.22 104 0 0 - 7 55 23 16 6 42.4 11 247 -69 - 7 59 53 - 7 50 54 - 8 3 15 - 7 47 32 0.23 105 0 0 - 7 27 30 16 6 43.6 10 247 -70 - 7 32 0 - 7 23 1 - 7 35 22 - 7 19 39 0.23 106 0 0 - 6 59 42 16 6 44.7 9 247 -71 - 7 4 12 - 6 55 13 - 7 7 33 - 6 51 51 0.23 107 0 0 - 6 32 0 16 6 45.7 8 247 -72 - 6 36 29 - 6 27 31 - 6 39 51 - 6 24 10 0.23 108 0 0 - 6 4 25 16 6 46.6 7 247 -73 - 6 8 54 - 5 59 56 - 6 12 15 - 5 56 35 0.24 109 0 0 - 5 36 57 16 6 47.3 6 247 -74 - 5 41 26 - 5 32 29 - 5 44 47 - 5 29 8 0.25 110 0 0 - 5 9 38 16 6 48.0 5 247 -74 - 5 14 6 - 5 5 9 - 5 17 27 - 5 1 49 0.26 111 0 0 - 4 42 27 16 6 48.4 4 247 -75 - 4 46 55 - 4 37 59 - 4 50 16 - 4 34 38 0.27 112 0 0 - 4 15 26 16 6 48.8 3 246 -76 - 4 19 54 - 4 10 58 - 4 23 15 - 4 7 38 0.30 113 0 0 - 3 48 35 16 6 49.0 1 246 -76 - 3 53 3 - 3 44 8 - 3 56 23 - 3 40 48 0.38 114 0 0 - 3 21 55 16 6 49.1 0 246 -77 - 3 26 23 - 3 17 28 - 3 29 43 - 3 14 8 0.87 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: TYC 6876-00746-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 27 40.6489 DE: -23 43 55.680 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 27 40.6488 DE: -23 43 55.680 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.1 * B mag [mag]: 10.7 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (548) Kressida asteroid class: approx. diameter [km]: 15 approx. diameter ["]: 0.009 distance from Earth [AU]: 2.26300 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): 0.010", 0.003", 84.295° remarks: * orbital elements for (548)Kressida : Mean anomaly = 266.1467991880 deg Arg. of pericenter = 320.4227748283 deg Long. of node = 108.3944191163 deg Inclination = 3.8716325721 deg Eccentricity = 0.1844476623 Semimajor axis = 2.2821245326 AU Perihelion dist = 1.8611919976 AU Mag: H = 11.27, G = 0.15 Epoch of elements : MJD 60601.66753096 TDT (2024 Oct 18.6675) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#492023Apr24,0.79,2024,10,18,16.020751,0.024158,-0.186953,10.483539,1.358442,0.005507,0.000822,0.000000,0.000000 24.3477,-23.6830,-64.05,-9.96,False TYC 6876-00746-1,19.46129139,-23.7321331,10.71,10.14,9.83,0.1,0,,19.48614166,-23.6830062,5.94,5.79,0,0,0 548,Kressida,16.07,14.723,2.2630,0,0,2.966,5.29,,1.8,0 0,265.9560,2024,10,18,320.4228,108.3944,3.8716,0.18445,2.28212,1.86119,11.27,5.0,0.15 1.374,0.0103,0.0033,84,0.0033,Known errors,1.03,0,-1,-1 20241018_0746-1,60140.64 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:27 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org