IOTA/IOTA-ES occultation update for (5471) Tunguska / TYC 5728-01491-1 event on 2024 Jul 31, 16:51 UT Visible from Summary ------- On 2024 Jul 31 UT, the 17.343 km diameter asteroid (5471) Tunguska will occult a 11.4 mag star in the constellation Aquila for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.25 mag to 15.65 mag (the magnitude of the asteroid) for at most 1.650 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: 94 * date and approx. time of event: 2024 Jul 31, 16:42 - 2024 Jul 31, 17:01 * geocentric midpoint of event [JD]: 2460523.20261609 * magnitude of target star: 11.42 * magnitude drop [mag]: 4.25 * estimated maximum duration [s]: 1.650 * Moon: 15 % sunlit, 143° distance * Sun: 164° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 19 * 1 sigma uncertainty interval [path widths]: +/- 0.46 * 1 sigma uncertainty interval [seconds]: +/- 3.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.028, +/- 0.009) * 1 sigma uncertainty ellipse (major, minor, PA): (0.030", 0.002", 73°) * approx speed of asteroid's shadow [km/s]: 10.4825 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5728-01491-1 by 5471 Tunguska on 2024 Jul 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 - 2 0 0 -26 7 27 17 1 15.5 1 100 8 -26 2 21 -26 12 32 -25 57 39 -26 17 15 .... - 1 0 0 -26 17 34 17 1 15.3 2 100 7 -26 12 29 -26 22 40 -26 7 47 -26 27 22 0.31 0 0 0 -26 27 35 17 1 14.9 2 100 6 -26 22 29 -26 32 40 -26 17 47 -26 37 23 0.33 1 0 0 -26 37 28 17 1 14.4 3 99 5 -26 32 23 -26 42 33 -26 27 41 -26 47 16 0.34 2 0 0 -26 47 14 17 1 13.7 4 99 4 -26 42 9 -26 52 19 -26 37 27 -26 57 2 0.34 3 0 0 -26 56 53 17 1 12.9 5 98 3 -26 51 47 -27 1 58 -26 47 6 -27 6 40 0.35 4 0 0 -27 6 23 17 1 11.9 6 98 2 -27 1 18 -27 11 28 -26 56 37 -27 16 11 0.35 5 0 0 -27 15 46 17 1 10.7 7 97 1 -27 10 42 -27 20 51 -27 6 0 -27 25 33 0.35 6 0 0 -27 25 2 17 1 9.4 8 97 1 -27 19 57 -27 30 7 -27 15 16 -27 34 48 0.35 7 0 0 -27 34 9 17 1 7.9 9 96 0 -27 29 4 -27 39 14 -27 24 23 -27 43 56 0.36 8 0 0 -27 43 8 17 1 6.3 10 96 -1 -27 38 4 -27 48 13 -27 33 22 -27 52 54 0.36 9 0 0 -27 51 59 17 1 4.5 11 95 -2 -27 46 55 -27 57 4 -27 42 14 -28 1 45 0.36 10 0 0 -28 0 42 17 1 2.6 11 95 -3 -27 55 37 -28 5 46 -27 50 56 -28 10 27 0.36 11 0 0 -28 9 16 17 1 0.5 12 94 -4 -28 4 11 -28 14 20 -27 59 31 -28 19 1 0.36 12 0 0 -28 17 41 17 0 58.3 13 94 -5 -28 12 37 -28 22 45 -28 7 56 -28 27 27 0.36 13 0 0 -28 25 58 17 0 55.9 14 93 -6 -28 20 54 -28 31 2 -28 16 13 -28 35 43 0.36 14 0 0 -28 34 6 17 0 53.4 15 93 -6 -28 29 2 -28 39 10 -28 24 22 -28 43 51 0.36 15 0 0 -28 42 6 17 0 50.7 16 92 -7 -28 37 2 -28 47 9 -28 32 21 -28 51 50 0.36 16 0 0 -28 49 56 17 0 47.9 17 92 -8 -28 44 52 -28 55 0 -28 40 12 -28 59 41 0.36 17 0 0 -28 57 37 17 0 45.0 18 91 -9 -28 52 34 -29 2 41 -28 47 53 -29 7 22 0.36 18 0 0 -29 5 10 17 0 41.9 18 91 -10 -29 0 6 -29 10 13 -28 55 26 -29 14 54 0.36 19 0 0 -29 12 33 17 0 38.7 19 90 -11 -29 7 29 -29 17 36 -29 2 49 -29 22 17 0.36 20 0 0 -29 19 46 17 0 35.4 20 90 -12 -29 14 43 -29 24 50 -29 10 3 -29 29 30 0.36 21 0 0 -29 26 51 17 0 31.9 21 89 -13 -29 21 48 -29 31 54 -29 17 8 -29 36 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12 0.38 168 0 0 -18 36 43 16 42 58.0 21 266 -36 -18 31 36 -18 41 50 -18 26 53 -18 46 33 0.38 169 0 0 -18 25 5 16 42 54.3 20 266 -35 -18 19 58 -18 30 12 -18 15 15 -18 34 55 0.38 170 0 0 -18 13 29 16 42 50.7 19 266 -34 -18 8 22 -18 18 35 -18 3 39 -18 23 19 0.38 171 0 0 -18 1 55 16 42 47.3 18 265 -33 -17 56 48 -18 7 1 -17 52 5 -18 11 45 0.38 172 0 0 -17 50 23 16 42 44.1 17 265 -32 -17 45 16 -17 55 29 -17 40 33 -18 0 13 0.38 173 0 0 -17 38 53 16 42 41.1 16 265 -31 -17 33 47 -17 43 59 -17 29 4 -17 48 43 0.38 174 0 0 -17 27 26 16 42 38.2 15 264 -30 -17 22 20 -17 32 32 -17 17 37 -17 37 16 0.38 175 0 0 -17 16 2 16 42 35.5 14 264 -29 -17 10 55 -17 21 8 -17 6 13 -17 25 51 0.38 176 0 0 -17 4 41 16 42 32.9 13 264 -28 -16 59 34 -17 9 47 -16 54 52 -17 14 30 0.39 177 0 0 -16 53 23 16 42 30.5 12 263 -27 -16 48 17 -16 58 29 -16 43 34 -17 3 12 0.39 178 0 0 -16 42 8 16 42 28.4 11 263 -26 -16 37 2 -16 47 15 -16 32 20 -16 51 58 0.39 179 0 0 -16 30 58 16 42 26.3 10 263 -25 -16 25 52 -16 36 4 -16 21 9 -16 40 47 0.39 180 0 0 -16 19 51 16 42 24.5 9 263 -24 -16 14 45 -16 24 57 -16 10 3 -16 29 40 0.39 -179 0 0 -16 8 49 16 42 22.9 8 262 -23 -16 3 43 -16 13 55 -15 59 1 -16 18 38 0.40 -178 0 0 -15 57 51 16 42 21.4 7 262 -22 -15 52 45 -16 2 57 -15 48 3 -16 7 40 0.40 -177 0 0 -15 46 58 16 42 20.1 6 262 -22 -15 41 52 -15 52 4 -15 37 10 -15 56 47 0.41 -176 0 0 -15 36 10 16 42 19.0 5 261 -21 -15 31 4 -15 41 16 -15 26 22 -15 45 58 0.41 -175 0 0 -15 25 27 16 42 18.1 4 261 -20 -15 20 21 -15 30 32 -15 15 39 -15 35 15 0.43 -174 0 0 -15 14 49 16 42 17.4 3 261 -19 -15 9 44 -15 19 55 -15 5 1 -15 24 37 0.44 -173 0 0 -15 4 17 16 42 16.9 2 261 -18 -14 59 12 -15 9 22 -14 54 30 -15 14 5 0.48 -172 0 0 -14 53 51 16 42 16.5 1 260 -17 -14 48 45 -14 58 56 -14 44 3 -15 3 38 0.56 -171 0 0 -14 43 30 16 42 16.4 0 260 -16 -14 38 25 -14 48 36 -14 33 43 -14 53 18 1.22 Uncertainty in time = +/- 4 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: TYC 5728-01491-1 * constellation : Aquila * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 47 10.0085 DE: -09 41 22.829 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 47 10.0084 DE: -09 41 22.828 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.4 * B mag [mag]: 11.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (5471) Tunguska asteroid class: approx. diameter [km]: 17 approx. diameter ["]: 0.013 distance from Earth [AU]: 1.80860 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 25 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): 0.030", 0.002", 73.044° remarks: * orbital elements for (5471)Tunguska : Mean anomaly = 19.7411556411 deg Arg. of pericenter = 28.5735152913 deg Long. of node = 250.2324213453 deg Inclination = 9.3204835008 deg Eccentricity = 0.0714216815 Semimajor axis = 2.9972996800 AU Perihelion dist = 2.7832274970 AU Mag: H = 11.67, G = 0.15 Epoch of elements : MJD 60522.70261654 TDT (2024 Jul 31.7026) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#602023Apr25,1.65,2024,7,31,16.862786,0.035018,-0.348630,-5.887131,-0.590078,0.001289,-0.000851,0.000001,0.000000 94.3888,-9.6286,-71.34,18.01,False TYC 5728-01491-1,19.78611347,-9.6896747,11.84,11.42,11.19,0.0,0,,19.80883875,-9.6286404,4.25,4.04,0,0,0 5471,Tunguska,15.65,17.343,1.8086,0,0,-1.935,-2.87,,2.4,0 0,19.6077,2024,7,31,28.5735,250.2324,9.3205,0.07142,2.99730,2.78323,11.67,5.0,0.15 1.462,0.0297,0.0021,73,0.0061,Known errors,1.36,0,-1,-1 20240731_1491-1,60140.23 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 05:25 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org