IOTA/IOTA-ES occultation update for (1427) Ruvuma / TYC 6931-00561-1 event on 2024 Oct 31, 17:20 UT Visible from Summary ------- On 2024 Oct 31 UT, the 37.747 km diameter asteroid (1427) Ruvuma will occult a 10.7 mag star in the constellation Microscopium for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.85 mag to 15.57 mag (the magnitude of the asteroid) for at most 1.870 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 31, 17:15 - 2024 Oct 31, 17:26 * geocentric midpoint of event [JD]: 2460615.22270409 * magnitude of target star: 10.73 * magnitude drop [mag]: 4.85 * estimated maximum duration [s]: 1.870 * Moon: 1 % sunlit, 100° distance * Sun: 91° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 38 * 1 sigma uncertainty interval [path widths]: +/- 0.24 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.019, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.019", 0.004", 80°) * approx speed of asteroid's shadow [km/s]: 20.1663 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6931-00561-1 by 1427 Ruvuma on 2024 Oct 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 - 85 0 0 -20 48 23 17 15 25.6 0 120 83 -21 0 9 -20 36 36 -21 5 52 -20 30 53 .... - 84 0 0 -21 20 15 17 15 25.7 1 119 83 -21 31 59 -21 8 31 -21 37 40 -21 2 50 0.09 - 83 0 0 -21 51 31 17 15 25.9 3 119 82 -22 3 13 -21 39 50 -22 8 53 -21 34 10 0.05 - 82 0 0 -22 22 11 17 15 26.2 4 119 82 -22 33 50 -22 10 33 -22 39 28 -22 4 54 0.03 - 81 0 0 -22 52 14 17 15 26.6 5 118 81 -23 3 50 -22 40 38 -23 9 27 -22 35 1 0.02 - 80 0 0 -23 21 40 17 15 27.1 6 118 81 -23 33 13 -23 10 6 -23 38 49 -23 4 30 0.01 - 79 0 0 -23 50 28 17 15 27.8 7 117 80 -24 1 59 -23 38 58 -24 7 33 -23 33 23 0.00 - 78 0 0 -24 18 40 17 15 28.5 8 117 79 -24 30 7 -24 7 12 -24 35 41 -24 1 38 0.00 - 77 0 0 -24 46 14 17 15 29.3 9 117 78 -24 57 39 -24 34 48 -25 3 11 -24 29 16 0.00 - 76 0 0 -25 13 10 17 15 30.2 10 116 77 -25 24 33 -25 1 48 -25 30 3 -24 56 17 0.00 - 75 0 0 -25 39 29 17 15 31.2 11 116 76 -25 50 49 -25 28 9 -25 56 19 -25 22 40 -0.01 - 74 0 0 -26 5 11 17 15 32.3 12 115 76 -26 16 28 -25 53 53 -26 21 56 -25 48 25 -0.01 - 73 0 0 -26 30 15 17 15 33.5 13 115 75 -26 41 30 -26 19 0 -26 46 57 -26 13 33 -0.01 - 72 0 0 -26 54 42 17 15 34.7 14 114 74 -27 5 54 -26 43 30 -27 11 20 -26 38 4 -0.01 - 71 0 0 -27 18 31 17 15 36.1 15 114 73 -27 29 41 -27 7 22 -27 35 6 -27 1 57 -0.01 - 70 0 0 -27 41 44 17 15 37.5 16 114 72 -27 52 51 -27 30 36 -27 58 14 -27 25 13 -0.01 - 69 0 0 -28 4 19 17 15 39.0 17 113 71 -28 15 24 -27 53 14 -28 20 46 -27 47 52 -0.01 - 68 0 0 -28 26 17 17 15 40.5 18 113 70 -28 37 19 -28 15 15 -28 42 40 -28 9 54 -0.01 - 67 0 0 -28 47 38 17 15 42.2 19 112 69 -28 58 38 -28 36 38 -29 3 58 -28 31 18 -0.01 - 66 0 0 -29 8 23 17 15 43.9 20 112 68 -29 19 21 -28 57 25 -29 24 39 -28 52 6 -0.01 - 65 0 0 -29 28 31 17 15 45.7 20 111 68 -29 39 26 -29 17 36 -29 44 44 -29 12 18 -0.02 - 64 0 0 -29 48 3 17 15 47.5 21 111 67 -29 58 56 -29 37 9 -30 4 12 -29 31 53 -0.02 - 63 0 0 -30 6 58 17 15 49.4 22 110 66 -30 17 49 -29 56 7 -30 23 4 -29 50 52 -0.02 - 62 0 0 -30 25 18 17 15 51.4 23 110 65 -30 36 6 -30 14 29 -30 41 21 -30 9 14 -0.02 - 61 0 0 -30 43 1 17 15 53.5 24 109 64 -30 53 48 -30 32 14 -30 59 1 -30 27 1 -0.02 - 60 0 0 -31 0 9 17 15 55.6 25 109 63 -31 10 54 -30 49 24 -31 16 6 -30 44 12 -0.02 - 59 0 0 -31 16 42 17 15 57.7 26 108 62 -31 27 24 -31 5 59 -31 32 36 -31 0 47 -0.02 - 58 0 0 -31 32 39 17 16 0.0 27 108 61 -31 43 19 -31 21 58 -31 48 30 -31 16 47 -0.02 - 57 0 0 -31 48 1 17 16 2.2 28 107 60 -31 58 40 -31 37 22 -32 3 49 -31 32 12 -0.02 - 56 0 0 -32 2 48 17 16 4.6 29 107 60 -32 13 25 -31 52 11 -32 18 34 -31 47 2 -0.02 - 55 0 0 -32 17 1 17 16 7.0 30 106 59 -32 27 36 -32 6 26 -32 32 44 -32 1 18 -0.02 - 54 0 0 -32 30 39 17 16 9.4 30 105 58 -32 41 13 -32 20 6 -32 46 20 -32 14 58 -0.02 - 53 0 0 -32 43 43 17 16 11.9 31 105 57 -32 54 15 -32 33 11 -32 59 21 -32 28 5 -0.02 - 52 0 0 -32 56 13 17 16 14.4 32 104 56 -33 6 44 -32 45 43 -33 11 49 -32 40 37 -0.02 - 51 0 0 -33 8 9 17 16 17.0 33 104 55 -33 18 38 -32 57 40 -33 23 43 -32 52 35 -0.02 - 50 0 0 -33 19 32 17 16 19.7 34 103 54 -33 29 59 -33 9 4 -33 35 3 -33 4 0 -0.02 - 49 0 0 -33 30 20 17 16 22.4 35 103 54 -33 40 46 -33 19 54 -33 45 50 -33 14 51 -0.02 - 48 0 0 -33 40 36 17 16 25.1 36 102 53 -33 51 1 -33 30 11 -33 56 3 -33 25 8 -0.02 - 47 0 0 -33 50 18 17 16 27.9 37 102 52 -34 0 42 -33 39 55 -34 5 44 -33 34 52 -0.02 - 46 0 0 -33 59 27 17 16 30.8 37 101 51 -34 9 50 -33 49 5 -34 14 51 -33 44 3 -0.02 - 45 0 0 -34 8 4 17 16 33.7 38 101 50 -34 18 25 -33 57 43 -34 23 26 -33 52 42 -0.02 - 44 0 0 -34 16 8 17 16 36.6 39 100 49 -34 26 28 -34 5 47 -34 31 28 -34 0 47 -0.02 - 43 0 0 -34 23 39 17 16 39.6 40 100 49 -34 33 58 -34 13 20 -34 38 58 -34 8 19 -0.02 - 42 0 0 -34 30 37 17 16 42.6 41 99 48 -34 40 55 -34 20 19 -34 45 55 -34 15 19 -0.02 - 41 0 0 -34 37 4 17 16 45.7 42 98 47 -34 47 21 -34 26 46 -34 52 20 -34 21 47 -0.02 - 40 0 0 -34 42 58 17 16 48.8 42 98 46 -34 53 14 -34 32 41 -34 58 13 -34 27 42 -0.03 - 39 0 0 -34 48 20 17 16 51.9 43 97 45 -34 58 35 -34 38 4 -35 3 34 -34 33 5 -0.03 - 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9 46 10 17 23 32.4 57 233 -33 - 9 58 46 - 9 33 34 -10 4 52 - 9 27 27 -0.02 44 0 0 - 9 3 19 17 23 38.1 56 232 -34 - 9 15 57 - 8 50 42 - 9 22 4 - 8 44 34 -0.02 45 0 0 - 8 20 6 17 23 43.7 55 232 -35 - 8 32 45 - 8 7 26 - 8 38 53 - 8 1 18 -0.02 46 0 0 - 7 36 30 17 23 49.3 54 232 -37 - 7 49 11 - 7 23 49 - 7 55 20 - 7 17 40 -0.02 47 0 0 - 6 52 35 17 23 54.8 52 232 -38 - 7 5 17 - 6 39 52 - 7 11 27 - 6 33 42 -0.02 48 0 0 - 6 8 21 17 24 0.2 51 232 -39 - 6 21 5 - 5 55 37 - 6 27 15 - 5 49 26 -0.02 49 0 0 - 5 23 50 17 24 5.6 50 232 -40 - 5 36 35 - 5 11 4 - 5 42 46 - 5 4 53 -0.02 50 0 0 - 4 39 4 17 24 10.9 49 232 -42 - 4 51 50 - 4 26 17 - 4 58 2 - 4 20 5 -0.02 51 0 0 - 3 54 4 17 24 16.0 47 232 -43 - 4 6 51 - 3 41 16 - 4 13 4 - 3 35 4 -0.02 52 0 0 - 3 8 53 17 24 21.1 46 232 -44 - 3 21 41 - 2 56 4 - 3 27 53 - 2 49 52 -0.02 53 0 0 - 2 23 31 17 24 26.1 45 232 -45 - 2 36 21 - 2 10 42 - 2 42 33 - 2 4 29 -0.01 54 0 0 - 1 38 2 17 24 31.0 43 232 -47 - 1 50 52 - 1 25 12 - 1 57 5 - 1 18 59 -0.01 55 0 0 - 0 52 27 17 24 35.7 42 232 -48 - 1 5 17 - 0 39 36 - 1 11 30 - 0 33 23 -0.01 56 0 0 - 0 6 47 17 24 40.4 41 232 -49 - 0 19 37 0 6 4 - 0 25 51 0 12 17 -0.01 57 0 0 0 38 56 17 24 44.9 40 232 -50 0 26 5 0 51 46 0 19 51 0 58 0 -0.01 58 0 0 1 24 39 17 24 49.3 38 232 -51 1 11 48 1 37 29 1 5 34 1 43 43 -0.01 59 0 0 2 10 20 17 24 53.6 37 232 -53 1 57 30 2 23 11 1 51 16 2 29 24 -0.01 60 0 0 2 55 59 17 24 57.8 36 232 -54 2 43 8 3 8 49 2 36 55 3 15 2 -0.01 61 0 0 3 41 32 17 25 1.8 35 232 -55 3 28 42 3 54 22 3 22 29 4 0 35 -0.01 62 0 0 4 26 59 17 25 5.7 33 232 -56 4 14 9 4 39 48 4 7 56 4 46 1 -0.01 63 0 0 5 12 17 17 25 9.4 32 232 -58 4 59 28 5 25 5 4 53 15 5 31 18 -0.01 64 0 0 5 57 24 17 25 13.0 31 233 -59 5 44 36 6 10 12 5 38 24 6 16 24 -0.01 65 0 0 6 42 19 17 25 16.5 30 233 -60 6 29 32 6 55 6 6 23 20 7 1 18 -0.01 66 0 0 7 27 1 17 25 19.9 28 233 -61 7 14 15 7 39 47 7 8 3 7 45 58 -0.01 67 0 0 8 11 26 17 25 23.1 27 233 -62 7 58 42 8 24 11 7 52 31 8 30 22 -0.01 68 0 0 8 55 35 17 25 26.1 26 233 -63 8 42 52 9 8 18 8 36 42 9 14 28 -0.01 69 0 0 9 39 25 17 25 29.0 25 233 -65 9 26 43 9 52 7 9 20 34 9 58 16 -0.01 70 0 0 10 22 54 17 25 31.8 23 234 -66 10 10 14 10 35 35 10 4 6 10 41 43 -0.01 71 0 0 11 6 2 17 25 34.4 22 234 -67 10 53 24 11 18 41 10 47 16 11 24 49 -0.01 72 0 0 11 48 47 17 25 36.8 21 234 -68 11 36 10 12 1 24 11 30 3 12 7 31 -0.01 73 0 0 12 31 8 17 25 39.1 20 234 -69 12 18 33 12 43 43 12 12 27 12 49 49 -0.01 74 0 0 13 13 2 17 25 41.3 19 234 -70 13 0 29 13 25 35 12 54 24 13 31 40 -0.01 75 0 0 13 54 30 17 25 43.3 17 235 -71 13 41 59 14 7 1 13 35 55 14 13 5 -0.01 76 0 0 14 35 30 17 25 45.2 16 235 -72 14 23 1 14 47 59 14 16 58 14 54 2 -0.01 77 0 0 15 16 1 17 25 47.0 15 235 -73 15 3 34 15 28 27 14 57 32 15 34 29 0.00 78 0 0 15 56 1 17 25 48.6 14 235 -74 15 43 37 16 8 26 15 37 36 16 14 26 0.00 79 0 0 16 35 31 17 25 50.0 13 236 -75 16 23 9 16 47 53 16 17 9 16 53 52 0.00 80 0 0 17 14 29 17 25 51.4 11 236 -76 17 2 9 17 26 48 16 56 11 17 32 47 0.00 81 0 0 17 52 54 17 25 52.6 10 236 -77 17 40 37 18 5 11 17 34 39 18 11 8 0.00 82 0 0 18 30 45 17 25 53.6 9 237 -77 18 18 31 18 43 0 18 12 35 18 48 56 0.00 83 0 0 19 8 3 17 25 54.5 8 237 -78 18 55 51 19 20 15 18 49 56 19 26 9 0.00 84 0 0 19 44 46 17 25 55.3 7 237 -79 19 32 36 19 56 55 19 26 43 20 2 48 0.01 85 0 0 20 20 53 17 25 56.0 6 238 -79 20 8 47 20 33 0 20 2 54 20 38 52 0.01 86 0 0 20 56 25 17 25 56.6 5 238 -80 20 44 21 21 8 29 20 38 30 21 14 20 0.02 87 0 0 21 31 21 17 25 57.0 4 238 -80 21 19 19 21 43 22 21 13 30 21 49 11 0.03 88 0 0 22 5 40 17 25 57.3 2 239 -80 21 53 41 22 17 38 21 47 53 22 23 26 0.04 89 0 0 22 39 22 17 25 57.5 1 239 -80 22 27 26 22 51 17 22 21 39 22 57 4 0.09 90 0 0 23 12 27 17 25 57.6 0 239 -80 23 0 34 23 24 19 22 54 48 23 30 5 0.45 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: TYC 6931-00561-1 * constellation : Microscopium * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 59 57.0662 DE: -27 51 50.455 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 59 57.0661 DE: -27 51 50.455 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.7 * B mag [mag]: 11.0 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1427) Ruvuma asteroid class: approx. diameter [km]: 38 approx. diameter ["]: 0.027 distance from Earth [AU]: 1.93320 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#60 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", 0.004", 80.404° remarks: * orbital elements for (1427)Ruvuma : Mean anomaly = 10.7736868195 deg Arg. of pericenter = 241.7377566451 deg Long. of node = 78.4075171124 deg Inclination = 9.3431387981 deg Eccentricity = 0.2102280949 Semimajor axis = 2.7503902059 AU Perihelion dist = 2.1721809127 AU Mag: H = 11.23, G = 0.15 Epoch of elements : MJD 60614.72270380 TDT (2024 Oct 31.7227) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#602023Apr24,1.87,2024,10,31,17.344898,-0.011549,0.025084,10.325164,4.790695,0.005332,0.001622,0.000000,0.000000 14.6833,-27.7690,-84.28,-14.43,False TYC 6931-00561-1,20.99918509,-27.8640150,10.98,10.73,10.60,0.0,0,,21.02385222,-27.7689977,4.86,4.55,0,0,0 1427,Ruvuma,15.57,37.747,1.9332,0,0,3.539,21.80,,1.8,0 0,10.6175,2024,10,31,241.7378,78.4075,9.3431,0.21023,2.75039,2.17218,11.23,5.0,0.15 1.242,0.0190,0.0043,80,0.0065,Known errors,1.04,0,-1,-1 20241031_0561-1,60140.67 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:07 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org