IOTA/IOTA-ES occultation update for (1427) Ruvuma / TYC 7459-01487-1 event on 2024 Aug 05, 23:19 UT Visible from Summary ------- On 2024 Aug 05 UT, the 37.732 km diameter asteroid (1427) Ruvuma will occult a 10.6 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 3.36 mag to 13.87 mag (the magnitude of the asteroid) for at most 5.360 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 Aug 05, 23:05 - 2024 Aug 05, 23:34 * geocentric midpoint of event [JD]: 2460528.47206716 * magnitude of target star: 10.56 * magnitude drop [mag]: 3.36 * estimated maximum duration [s]: 5.360 * Moon: 2 % sunlit, 150° distance * Sun: 162° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 40 * 1 sigma uncertainty interval [path widths]: +/- 0.32 * 1 sigma uncertainty interval [seconds]: +/- 4.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.034, +/- 0.010) * 1 sigma uncertainty ellipse (major, minor, PA): (0.034", 0.009", 83°) * approx speed of asteroid's shadow [km/s]: 7.0424 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7459-01487-1 by 1427 Ruvuma on 2024 Aug 5 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 -121 0 0 -38 51 57 23 33 51.7 0 133 17 .. .. .. -39 6 47 .. .. .. -39 16 22 .... -120 0 0 -39 35 38 23 33 51.4 1 132 16 -39 20 54 -39 50 24 -39 11 25 -39 59 56 0.36 -119 0 0 -40 18 26 23 33 50.9 2 132 15 -40 3 46 -40 33 9 -39 54 20 -40 42 38 0.35 -118 0 0 -41 0 23 23 33 50.0 3 131 14 -40 45 47 -41 15 1 -40 36 23 -41 24 28 0.35 -117 0 0 -41 41 28 23 33 48.9 4 131 13 -41 26 56 -41 56 2 -41 17 34 -42 5 26 0.35 -116 0 0 -42 21 40 23 33 47.5 5 130 12 -42 7 12 -42 36 10 -41 57 54 -42 45 32 0.35 -115 0 0 -43 1 1 23 33 45.8 6 129 11 -42 46 37 -43 15 26 -42 37 21 -43 24 45 0.35 -114 0 0 -43 39 29 23 33 43.8 7 129 10 -43 25 10 -43 53 50 -43 15 56 -44 3 6 0.35 -113 0 0 -44 17 5 23 33 41.7 8 128 9 -44 2 50 -44 31 22 -43 53 40 -44 40 35 0.35 -112 0 0 -44 53 50 23 33 39.3 9 127 8 -44 39 40 -45 8 2 -44 30 32 -45 17 12 0.35 -111 0 0 -45 29 43 23 33 36.7 10 126 7 -45 15 38 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23 6 3.1 12 237 -22 - 1 57 59 - 2 25 3 - 1 49 17 - 2 33 47 0.37 84 0 0 - 1 26 25 23 5 58.8 11 237 -21 - 1 12 58 - 1 39 54 - 1 4 19 - 1 48 36 0.38 85 0 0 - 0 41 58 23 5 55.0 10 237 -19 - 0 28 35 - 0 55 22 - 0 19 58 - 1 4 1 0.38 86 0 0 0 1 51 23 5 51.7 9 237 -18 0 15 10 - 0 11 29 0 23 45 - 0 20 5 0.39 87 0 0 0 45 1 23 5 48.8 7 237 -17 0 58 15 0 31 45 1 6 47 0 23 11 0.39 88 0 0 1 27 29 23 5 46.3 6 237 -16 1 40 40 1 14 17 1 49 9 1 5 46 0.40 89 0 0 2 9 16 23 5 44.3 5 237 -15 2 22 22 1 56 8 2 30 49 1 47 39 0.42 90 0 0 2 50 19 23 5 42.7 4 237 -14 3 3 22 2 37 16 3 11 46 2 28 50 0.44 91 0 0 3 30 40 23 5 41.6 3 237 -12 3 43 38 3 17 40 3 51 59 3 9 17 0.48 92 0 0 4 10 16 23 5 40.8 1 237 -11 4 23 10 3 57 20 4 31 28 3 49 0 0.60 93 0 0 4 49 6 23 5 40.5 0 238 -10 5 1 56 4 36 15 5 10 12 4 27 57 1.63 Uncertainty in time = +/- 4 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: TYC 7459-01487-1 * constellation : Microscopium * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 29 35.0826 DE: -32 24 56.475 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 29 35.0826 DE: -32 24 56.476 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 10.6 * B mag [mag]: 10.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1427) Ruvuma asteroid class: approx. diameter [km]: 38 approx. diameter ["]: 0.044 distance from Earth [AU]: 1.19250 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): 0.034", 0.009", 82.962° remarks: * orbital elements for (1427)Ruvuma : Mean anomaly = 352.0328767710 deg Arg. of pericenter = 241.7324719719 deg Long. of node = 78.4074670744 deg Inclination = 9.3431369513 deg Eccentricity = 0.2102834317 Semimajor axis = 2.7505792993 AU Perihelion dist = 2.1721780450 AU Mag: H = 11.23, G = 0.15 Epoch of elements : MJD 60527.97206737 TDT (2024 Aug 05.9721) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#602023Apr24,5.36,2024,8,5,23.329612,0.160325,-0.318272,-3.550244,-1.787655,0.000776,0.001403,0.000001,0.000000 2.8469,-32.3331,-168.46,16.62,False TYC 7459-01487-1,20.49307851,-32.4156874,10.82,10.56,10.42,0.0,0,,20.51913554,-32.3331267,3.36,3.07,0,0,0 1427,Ruvuma,13.87,37.732,1.1925,0,0,-2.065,-13.18,,1.8,0 0,351.8229,2024,8,5,241.7325,78.4075,9.3431,0.21028,2.75058,2.17218,11.23,5.0,0.15 1.322,0.0340,0.0087,83,0.0141,Known errors,1.78,0,-1,-1 20240805_1487-1,60140.23 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 05:37 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org