IOTA/IOTA-ES occultation update for (461) Saskia / TYC 5590-00709-1 event on 2024 Aug 03, 00:32 UT Visible from Summary ------- On 2024 Aug 03 UT, the 39.852 km diameter asteroid (461) Saskia will occult a 11.7 mag star in the constellation Libra for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.98 mag to 16.62 mag (the magnitude of the asteroid) for at most 2.970 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: 97 * date and approx. time of event: 2024 Aug 03, 00:24 - 2024 Aug 03, 00:40 * geocentric midpoint of event [JD]: 2460525.52271787 * magnitude of target star: 11.65 * magnitude drop [mag]: 4.98 * estimated maximum duration [s]: 2.970 * Moon: 2 % sunlit, 110° distance * Sun: 94° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 41 * 1 sigma uncertainty interval [path widths]: +/- 0.39 * 1 sigma uncertainty interval [seconds]: +/- 2.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.008) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.007", 111°) * approx speed of asteroid's shadow [km/s]: 13.4305 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5590-00709-1 by 461 Saskia on 2024 Aug 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 -175 0 0 32 51 10 0 25 3.1 1 108 72 32 39 29 33 2 51 32 30 26 33 11 55 .... -174 0 0 32 34 36 0 25 3.3 1 109 72 32 22 54 32 46 18 32 13 50 32 55 23 -0.10 -173 0 0 32 17 40 0 25 3.5 2 109 72 32 5 57 32 29 24 31 56 52 32 38 30 -0.15 -172 0 0 32 0 23 0 25 3.9 3 110 71 31 48 38 32 12 8 31 39 33 32 21 15 -0.18 -171 0 0 31 42 44 0 25 4.4 4 110 71 31 30 58 31 54 30 31 21 51 32 3 38 -0.19 -170 0 0 31 24 43 0 25 5.0 5 111 71 31 12 56 31 36 31 31 3 48 31 45 39 -0.20 -169 0 0 31 6 21 0 25 5.7 6 111 70 30 54 32 31 18 10 30 45 24 31 27 20 -0.21 -168 0 0 30 47 37 0 25 6.6 7 112 70 30 35 47 30 59 27 30 26 38 31 8 38 -0.21 -167 0 0 30 28 32 0 25 7.6 8 112 69 30 16 41 30 40 23 30 7 30 30 49 35 -0.22 -166 0 0 30 9 5 0 25 8.7 9 113 69 29 57 13 30 20 58 29 48 2 30 30 11 -0.22 -165 0 0 29 49 18 0 25 10.0 10 113 68 29 37 25 30 1 12 29 28 12 30 10 26 -0.22 -164 0 0 29 29 10 0 25 11.4 11 114 67 29 17 15 29 41 5 29 8 1 29 50 20 -0.22 -163 0 0 29 8 41 0 25 12.9 12 114 67 28 56 45 29 20 38 28 47 30 29 29 54 -0.23 -162 0 0 28 47 51 0 25 14.6 12 115 66 28 35 54 28 59 49 28 26 38 29 9 6 -0.23 -161 0 0 28 26 41 0 25 16.4 13 115 66 28 14 43 28 38 41 28 5 26 28 47 58 -0.23 -160 0 0 28 5 11 0 25 18.4 14 116 65 27 53 11 28 17 12 27 43 54 28 26 31 -0.23 -159 0 0 27 43 21 0 25 20.5 15 116 64 27 31 20 27 55 23 27 22 2 28 4 43 -0.23 -158 0 0 27 21 11 0 25 22.8 16 117 63 27 9 9 27 33 14 26 59 50 27 42 35 -0.23 -157 0 0 26 58 42 0 25 25.2 17 117 63 26 46 39 27 10 46 26 37 19 27 20 8 -0.23 -156 0 0 26 35 54 0 25 27.7 18 118 62 26 23 49 26 47 59 26 14 28 26 57 22 -0.23 -155 0 0 26 12 47 0 25 30.4 19 118 61 26 0 41 26 24 54 25 51 19 26 34 17 -0.23 -154 0 0 25 49 22 0 25 33.3 20 119 60 25 37 15 26 1 29 25 27 52 26 10 54 -0.23 -153 0 0 25 25 38 0 25 36.3 21 119 59 25 13 30 25 37 47 25 4 6 25 47 12 -0.23 -152 0 0 25 1 37 0 25 39.4 22 120 58 24 49 27 25 13 46 24 40 3 25 23 12 -0.23 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9 7 4 - 8 27 1 -0.26 - 62 0 0 - 8 55 30 0 36 56.4 54 257 -37 - 9 6 46 - 8 44 14 - 9 15 30 - 8 35 29 -0.26 - 61 0 0 - 9 3 29 0 37 3.5 53 257 -38 - 9 14 44 - 8 52 13 - 9 23 27 - 8 43 29 -0.26 - 60 0 0 - 9 11 0 0 37 10.4 52 258 -39 - 9 22 14 - 8 59 45 - 9 30 57 - 8 51 1 -0.26 - 59 0 0 - 9 18 3 0 37 17.3 51 258 -40 - 9 29 16 - 9 6 48 - 9 37 58 - 8 58 5 -0.26 - 58 0 0 - 9 24 37 0 37 24.0 50 258 -41 - 9 35 50 - 9 13 23 - 9 44 32 - 9 4 41 -0.26 - 57 0 0 - 9 30 44 0 37 30.6 49 258 -42 - 9 41 56 - 9 19 30 - 9 50 37 - 9 10 48 -0.26 - 56 0 0 - 9 36 22 0 37 37.2 48 258 -43 - 9 47 34 - 9 25 9 - 9 56 15 - 9 16 27 -0.26 - 55 0 0 - 9 41 32 0 37 43.6 47 259 -44 - 9 52 44 - 9 30 20 -10 1 24 - 9 21 39 -0.26 - 54 0 0 - 9 46 15 0 37 49.9 46 259 -45 - 9 57 26 - 9 35 3 -10 6 6 - 9 26 22 -0.26 - 53 0 0 - 9 50 29 0 37 56.1 45 259 -46 -10 1 40 - 9 39 17 -10 10 20 - 9 30 37 -0.26 - 52 0 0 - 9 54 15 0 38 2.2 44 259 -47 -10 5 26 - 9 43 4 -10 14 5 - 9 34 23 -0.26 - 51 0 0 - 9 57 33 0 38 8.1 43 259 -48 -10 8 44 - 9 46 23 -10 17 23 - 9 37 42 -0.26 - 50 0 0 -10 0 24 0 38 14.0 42 259 -49 -10 11 34 - 9 49 13 -10 20 12 - 9 40 33 -0.26 - 49 0 0 -10 2 46 0 38 19.7 41 259 -50 -10 13 56 - 9 51 36 -10 22 34 - 9 42 56 -0.26 - 48 0 0 -10 4 40 0 38 25.4 40 259 -51 -10 15 50 - 9 53 30 -10 24 28 - 9 44 50 -0.26 - 47 0 0 -10 6 7 0 38 30.9 39 259 -52 -10 17 16 - 9 54 57 -10 25 54 - 9 46 17 -0.26 - 46 0 0 -10 7 5 0 38 36.3 38 259 -53 -10 18 14 - 9 55 55 -10 26 53 - 9 47 16 -0.26 - 45 0 0 -10 7 36 0 38 41.5 37 259 -53 -10 18 45 - 9 56 26 -10 27 23 - 9 47 47 -0.26 - 44 0 0 -10 7 39 0 38 46.7 36 259 -54 -10 18 48 - 9 56 29 -10 27 26 - 9 47 50 -0.26 - 43 0 0 -10 7 14 0 38 51.7 35 259 -55 -10 18 23 - 9 56 4 -10 27 1 - 9 47 25 -0.26 - 42 0 0 -10 6 21 0 38 56.6 34 259 -56 -10 17 31 - 9 55 12 -10 26 9 - 9 46 32 -0.26 - 41 0 0 -10 5 1 0 39 1.4 33 259 -57 -10 16 10 - 9 53 51 -10 24 49 - 9 45 12 -0.26 - 40 0 0 -10 3 13 0 39 6.1 32 259 -58 -10 14 23 - 9 52 3 -10 23 1 - 9 43 24 -0.26 - 39 0 0 -10 0 58 0 39 10.6 31 259 -59 -10 12 7 - 9 49 48 -10 20 46 - 9 41 8 -0.26 - 38 0 0 - 9 58 15 0 39 15.0 30 259 -60 -10 9 25 - 9 47 5 -10 18 3 - 9 38 25 -0.26 - 37 0 0 - 9 55 5 0 39 19.3 29 258 -61 -10 6 15 - 9 43 54 -10 14 54 - 9 35 14 -0.26 - 36 0 0 - 9 51 27 0 39 23.4 28 258 -62 -10 2 37 - 9 40 16 -10 11 16 - 9 31 36 -0.26 - 35 0 0 - 9 47 22 0 39 27.4 27 258 -63 - 9 58 32 - 9 36 11 -10 7 12 - 9 27 30 -0.26 - 34 0 0 - 9 42 49 0 39 31.3 26 258 -64 - 9 54 0 - 9 31 38 -10 2 40 - 9 22 57 -0.26 - 33 0 0 - 9 37 50 0 39 35.1 25 258 -65 - 9 49 1 - 9 26 38 - 9 57 41 - 9 17 57 -0.26 - 32 0 0 - 9 32 23 0 39 38.7 24 258 -66 - 9 43 35 - 9 21 11 - 9 52 15 - 9 12 29 -0.26 - 31 0 0 - 9 26 29 0 39 42.2 23 258 -67 - 9 37 41 - 9 15 17 - 9 46 22 - 9 6 35 -0.26 - 30 0 0 - 9 20 8 0 39 45.5 22 258 -67 - 9 31 21 - 9 8 55 - 9 40 2 - 9 0 13 -0.26 - 29 0 0 - 9 13 21 0 39 48.7 21 258 -68 - 9 24 34 - 9 2 7 - 9 33 15 - 8 53 24 -0.26 - 28 0 0 - 9 6 6 0 39 51.8 20 257 -69 - 9 17 20 - 8 54 52 - 9 26 2 - 8 46 9 -0.26 - 27 0 0 - 8 58 25 0 39 54.7 19 257 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256 -78 - 7 3 29 - 6 40 41 - 7 12 19 - 6 31 50 -0.26 - 14 0 0 - 6 38 47 0 40 19.7 6 256 -78 - 6 50 12 - 6 27 22 - 6 59 2 - 6 18 30 -0.26 - 13 0 0 - 6 25 4 0 40 20.5 5 256 -78 - 6 36 30 - 6 13 38 - 6 45 21 - 6 4 45 -0.26 - 12 0 0 - 6 10 56 0 40 21.2 4 256 -78 - 6 22 23 - 5 59 29 - 6 31 15 - 5 50 36 -0.26 - 11 0 0 - 5 56 24 0 40 21.8 3 255 -78 - 6 7 52 - 5 44 55 - 6 16 44 - 5 36 1 -0.26 - 10 0 0 - 5 41 27 0 40 22.2 2 255 -78 - 5 52 56 - 5 29 58 - 6 1 50 - 5 21 3 -0.27 - 9 0 0 - 5 26 6 0 40 22.4 1 255 -78 - 5 37 36 - 5 14 36 - 5 46 31 - 5 5 40 -0.28 - 8 0 0 - 5 10 22 0 40 22.5 0 255 -78 - 5 21 53 .. .. .. - 5 30 48 .. .. .. -1.13 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: TYC 5590-00709-1 * constellation : Libra * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 14 50 07.0700 DE: -14 41 44.807 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 14 50 07.0699 DE: -14 41 44.807 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.7 * B mag [mag]: 11.9 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (461) Saskia asteroid class: approx. diameter [km]: 40 approx. diameter ["]: 0.017 distance from Earth [AU]: 3.19420 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#56 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): 0.013", 0.007", 111.179° remarks: * orbital elements for (461)Saskia : Mean anomaly = 124.0875679691 deg Arg. of pericenter = 308.7416518397 deg Long. of node = 156.5170021765 deg Inclination = 1.4718958333 deg Eccentricity = 0.1456039933 Semimajor axis = 3.1182872458 AU Perihelion dist = 2.6642521705 AU Mag: H = 10.52, G = 0.15 Epoch of elements : MJD 60525.02271792 TDT (2024 Aug 03.0227) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#562023Apr24,2.97,2024,8,3,0.545229,0.084316,0.234081,7.136344,-2.556828,0.005464,-0.001680,0.000000,0.000000 -97.3989,-14.7979,173.38,17.42,False TYC 5590-00709-1,14.83529725,-14.6957799,11.92,11.65,11.50,0.0,0,,14.85789592,-14.7978809,4.98,4.68,0,0,0 461,Saskia,16.62,39.852,3.1942,0,0,1.355,-7.04,,2.6,0 0,123.9045,2024,8,2,308.7417,156.5170,1.4719,0.14560,3.11829,2.66425,10.52,5.0,0.15 1.388,0.0130,0.0067,111,0.0067,Known errors,1.03,0,-1,-1 20240803_0709-1,60140.23 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 05:30 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org