IOTA/IOTA-ES occultation update for (309) Fraternitas / TYC 1941-01493-1 event on 2024 Oct 17, 22:18 UT Visible from Summary ------- On 2024 Oct 17 UT, the 42.581 km diameter asteroid (309) Fraternitas will occult a 11.3 mag star in the constellation Cancer for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.04 mag to 16.34 mag (the magnitude of the asteroid) for at most 2.260 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: 2024 Oct 17, 22:12 - 2024 Oct 17, 22:23 * geocentric midpoint of event [JD]: 2460601.42919537 * magnitude of target star: 11.31 * magnitude drop [mag]: 5.04 * estimated maximum duration [s]: 2.260 * Moon: 100 % sunlit, 91° distance * Sun: 82° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 43 * 1 sigma uncertainty interval [path widths]: +/- 0.14 * 1 sigma uncertainty interval [seconds]: +/- 0.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.007, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.008", 0.003", 106°) * approx speed of asteroid's shadow [km/s]: 18.8144 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1941-01493-1 by 309 Fraternitas on 2024 Oct 17 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 32 0 0 11 44 12 22 12 23.8 1 67 -81 11 31 36 11 56 48 11 27 58 12 0 26 .... 33 0 0 12 9 39 22 12 24.0 2 67 -80 11 57 4 12 22 14 11 53 26 12 25 52 -0.11 34 0 0 12 34 52 22 12 24.2 3 67 -79 12 22 18 12 47 27 12 18 41 12 51 4 -0.09 35 0 0 12 59 52 22 12 24.6 4 67 -78 12 47 19 13 12 25 12 43 41 13 16 2 -0.08 36 0 0 13 24 36 22 12 25.1 5 68 -77 13 12 4 13 37 9 13 8 27 13 40 46 -0.07 37 0 0 13 49 5 22 12 25.7 6 68 -76 13 36 34 14 1 37 13 32 57 14 5 14 -0.07 38 0 0 14 13 19 22 12 26.5 7 68 -75 14 0 49 14 25 49 13 57 12 14 29 26 -0.07 39 0 0 14 37 16 22 12 27.3 8 68 -74 14 24 47 14 49 45 14 21 11 14 53 21 -0.06 40 0 0 15 0 56 22 12 28.3 9 69 -73 14 48 28 15 13 24 14 44 52 15 17 0 -0.06 41 0 0 15 24 19 22 12 29.3 10 69 -72 15 11 52 15 36 46 15 8 17 15 40 22 -0.06 42 0 0 15 47 25 22 12 30.5 11 69 -71 15 34 59 15 59 50 15 31 24 16 3 26 -0.06 43 0 0 16 10 12 22 12 31.8 12 69 -70 15 57 48 16 22 37 15 54 13 16 26 12 -0.06 44 0 0 16 32 41 22 12 33.1 13 70 -69 16 20 18 16 45 4 16 16 43 16 48 39 -0.06 45 0 0 16 54 51 22 12 34.6 14 70 -68 16 42 29 17 7 13 16 38 55 17 10 47 -0.06 46 0 0 17 16 42 22 12 36.2 16 70 -67 17 4 21 17 29 3 17 0 47 17 32 37 -0.06 47 0 0 17 38 13 22 12 37.9 17 71 -66 17 25 53 17 50 33 17 22 20 17 54 6 -0.06 48 0 0 17 59 24 22 12 39.7 18 71 -64 17 47 6 18 11 43 17 43 33 18 15 16 -0.06 49 0 0 18 20 15 22 12 41.5 19 71 -63 18 7 58 18 32 32 18 4 25 18 36 5 -0.06 50 0 0 18 40 46 22 12 43.5 20 71 -62 18 28 30 18 53 2 18 24 57 18 56 34 -0.05 51 0 0 19 0 55 22 12 45.6 21 72 -61 18 48 41 19 13 10 18 45 9 19 16 42 -0.05 52 0 0 19 20 44 22 12 47.7 22 72 -60 19 8 30 19 32 57 19 4 59 19 36 29 -0.05 53 0 0 19 40 11 22 12 50.0 23 72 -59 19 27 59 19 52 23 19 24 28 19 55 54 -0.05 54 0 0 19 59 16 22 12 52.3 24 73 -58 19 47 6 20 11 27 19 43 35 20 14 58 -0.05 55 0 0 20 18 0 22 12 54.7 25 73 -57 20 5 50 20 30 9 20 2 20 20 33 40 -0.05 56 0 0 20 36 21 22 12 57.2 26 74 -56 20 24 13 20 48 30 20 20 43 20 52 0 -0.05 57 0 0 20 54 20 22 12 59.8 27 74 -55 20 42 14 21 6 27 20 38 44 21 9 57 -0.05 58 0 0 21 11 57 22 13 2.5 28 74 -54 20 59 51 21 24 3 20 56 22 21 27 32 -0.05 59 0 0 21 29 11 22 13 5.2 29 75 -54 21 17 7 21 41 15 21 13 38 21 44 45 -0.05 60 0 0 21 46 2 22 13 8.1 30 75 -53 21 33 59 21 58 5 21 30 30 22 1 34 -0.05 61 0 0 22 2 30 22 13 11.0 31 75 -52 21 50 29 22 14 32 21 47 0 22 18 0 -0.05 62 0 0 22 18 35 22 13 13.9 32 76 -51 22 6 35 22 30 36 22 3 7 22 34 4 -0.05 63 0 0 22 34 17 22 13 17.0 32 76 -50 22 22 18 22 46 16 22 18 50 22 49 44 -0.05 64 0 0 22 49 35 22 13 20.1 33 77 -49 22 37 37 23 1 33 22 34 10 23 5 1 -0.05 65 0 0 23 4 30 22 13 23.3 34 77 -48 22 52 33 23 16 27 22 49 6 23 19 54 -0.05 66 0 0 23 19 1 22 13 26.6 35 77 -47 23 7 5 23 30 57 23 3 39 23 34 23 -0.05 67 0 0 23 33 8 22 13 29.9 36 78 -46 23 21 14 23 45 3 23 17 47 23 48 29 -0.05 68 0 0 23 46 52 22 13 33.3 37 78 -45 23 34 58 23 58 45 23 31 32 24 2 11 -0.05 69 0 0 24 0 11 22 13 36.8 38 79 -44 23 48 19 24 12 3 23 44 53 24 15 29 -0.05 70 0 0 24 13 7 22 13 40.3 39 79 -43 24 1 16 24 24 58 23 57 50 24 28 23 -0.05 71 0 0 24 25 38 22 13 43.9 40 80 -42 24 13 48 24 37 28 24 10 23 24 40 53 -0.05 72 0 0 24 37 46 22 13 47.6 41 80 -41 24 25 57 24 49 35 24 22 32 24 52 59 -0.05 73 0 0 24 49 29 22 13 51.3 42 81 -40 24 37 41 25 1 17 24 34 17 25 4 41 -0.05 74 0 0 25 0 48 22 13 55.0 43 81 -39 24 49 1 25 12 35 24 45 37 25 15 59 -0.05 75 0 0 25 11 42 22 13 58.9 44 81 -38 24 59 57 25 23 28 24 56 33 25 26 52 -0.05 76 0 0 25 22 13 22 14 2.7 45 82 -37 25 10 28 25 33 58 25 7 4 25 37 21 -0.05 77 0 0 25 32 19 22 14 6.7 46 82 -36 25 20 35 25 44 3 25 17 12 25 47 26 -0.05 78 0 0 25 42 0 22 14 10.7 47 83 -35 25 30 17 25 53 44 25 26 54 25 57 7 -0.05 79 0 0 25 51 18 22 14 14.7 48 83 -34 25 39 35 26 3 0 25 36 13 26 6 23 -0.05 80 0 0 26 0 10 22 14 18.8 49 84 -34 25 48 29 26 11 52 25 45 7 26 15 14 -0.05 81 0 0 26 8 39 22 14 22.9 49 84 -33 25 56 58 26 20 19 25 53 36 26 23 42 -0.05 82 0 0 26 16 43 22 14 27.1 50 85 -32 26 5 3 26 28 23 26 1 41 26 31 45 -0.05 83 0 0 26 24 22 22 14 31.3 51 85 -31 26 12 43 26 36 1 26 9 21 26 39 23 -0.05 84 0 0 26 31 37 22 14 35.6 52 86 -30 26 19 59 26 43 15 26 16 37 26 46 37 -0.04 85 0 0 26 38 27 22 14 40.0 53 86 -29 26 26 50 26 50 5 26 23 28 26 53 27 -0.04 86 0 0 26 44 53 22 14 44.3 54 87 -28 26 33 16 26 56 30 26 29 55 26 59 52 -0.04 87 0 0 26 50 55 22 14 48.7 55 87 -27 26 39 18 27 2 31 26 35 57 27 5 52 -0.04 88 0 0 26 56 31 22 14 53.2 56 88 -26 26 44 55 27 8 7 26 41 35 27 11 28 -0.04 89 0 0 27 1 44 22 14 57.7 57 89 -25 26 50 8 27 13 19 26 46 48 27 16 40 -0.04 90 0 0 27 6 31 22 15 2.2 58 89 -24 26 54 56 27 18 6 26 51 36 27 21 27 -0.04 91 0 0 27 10 55 22 15 6.8 59 90 -23 26 59 20 27 22 29 26 56 0 27 25 50 -0.04 92 0 0 27 14 53 22 15 11.5 60 90 -23 27 3 19 27 26 27 26 59 59 27 29 48 -0.04 93 0 0 27 18 27 22 15 16.1 60 91 -22 27 6 53 27 30 1 27 3 33 27 33 21 -0.04 94 0 0 27 21 37 22 15 20.8 61 91 -21 27 10 3 27 33 10 27 6 43 27 36 30 -0.04 95 0 0 27 24 22 22 15 25.6 62 92 -20 27 12 48 27 35 55 27 9 28 27 39 15 -0.04 96 0 0 27 26 42 22 15 30.3 63 93 -19 27 15 9 27 38 15 27 11 49 27 41 35 -0.04 97 0 0 27 28 38 22 15 35.1 64 93 -18 27 17 5 27 40 10 27 13 45 27 43 30 -0.04 98 0 0 27 30 9 22 15 40.0 65 94 -17 27 18 36 27 41 41 27 15 16 27 45 1 -0.04 99 0 0 27 31 15 22 15 44.9 66 95 -16 27 19 43 27 42 48 27 16 23 27 46 8 -0.04 100 0 0 27 31 57 22 15 49.8 67 95 -15 27 20 25 27 43 30 27 17 5 27 46 50 -0.04 101 0 0 27 32 15 22 15 54.7 68 96 -14 27 20 42 27 43 47 27 17 22 27 47 7 -0.04 102 0 0 27 32 7 22 15 59.7 69 97 -14 27 20 35 27 43 40 27 17 15 27 47 0 -0.04 103 0 0 27 31 35 22 16 4.7 69 97 -13 27 20 3 27 43 8 27 16 43 27 46 28 -0.04 104 0 0 27 30 39 22 16 9.8 70 98 -12 27 19 6 27 42 11 27 15 46 27 45 31 -0.04 105 0 0 27 29 18 22 16 14.8 71 99 -11 27 17 45 27 40 50 27 14 25 27 44 10 -0.04 106 0 0 27 27 32 22 16 19.9 72 100 -10 27 15 59 27 39 5 27 12 39 27 42 25 -0.04 107 0 0 27 25 21 22 16 25.1 73 101 -9 27 13 48 27 36 54 27 10 28 27 40 14 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31 24 - 7 0 12 - 6 27 46 -0.51 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: TYC 1941-01493-1 * constellation : Cancer * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 08 22 52.3213 DE: +23 05 28.248 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 08 22 52.3214 DE: +23 05 28.248 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.3 * B mag [mag]: 11.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (309) Fraternitas asteroid class: approx. diameter [km]: 43 approx. diameter ["]: 0.020 distance from Earth [AU]: 2.90300 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#70 date of fit: 2023 Feb 11 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", 0.003", 106.152° remarks: * orbital elements for (309)Fraternitas : Mean anomaly = 148.9960849052 deg Arg. of pericenter = 311.4529666391 deg Long. of node = 356.3364237835 deg Inclination = 3.7077155490 deg Eccentricity = 0.1158221504 Semimajor axis = 2.6649917348 AU Perihelion dist = 2.3563266612 AU Mag: H = 10.70, G = 0.15 Epoch of elements : MJD 60600.92919505 TDT (2024 Oct 17.9292) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#702023Feb11,2.26,2024,10,17,22.300689,0.007557,0.041982,10.462199,-1.820305,-0.005567,0.001394,0.000000,0.000000 124.6664,23.0124,-158.22,-9.69,False TYC 1941-01493-1,8.38120035,23.0911802,11.80,11.31,11.05,0.0,0,,8.40548242,23.0123812,5.04,4.86,0,0,0 309,Fraternitas,16.34,42.581,2.9030,0,0,2.296,-5.52,,2.0,0 0,148.7856,2024,10,17,311.4530,356.3364,3.7077,0.11582,2.66499,2.35633,10.70,5.0,0.15 1.144,0.0077,0.0028,106,0.0029,Known errors,0.90,0,-1,-1 20241017_1493-1,60140.64 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:24 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org