IOTA/IOTA-ES occultation update for (7941) 1991 NE1 / TYC 6819-05013-1 event on 2024 Oct 20, 17:04 UT Visible from Summary ------- On 2024 Oct 20 UT, the 14.525702529054 km diameter asteroid (7941) 1991 NE1 will occult a 10.5 mag star in the constellation Ophiuchus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 8.61 mag to 19.14 mag (the magnitude of the asteroid) for at most 0.420 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 20, 17:01 - 2024 Oct 20, 17:07 * geocentric midpoint of event [JD]: 2460604.21159479 * magnitude of target star: 10.53 * magnitude drop [mag]: 8.61 * estimated maximum duration [s]: 0.420 * Moon: 85 % sunlit, 175° distance * Sun: 51° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 15 * 1 sigma uncertainty interval [path widths]: +/- 0.21 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.016, +/- 0.001) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.001", 89°) * approx speed of asteroid's shadow [km/s]: 35.2555 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6819-05013-1 by 7941 1991 NE1 on 2024 Oct 20 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 -125 0 0 .. .. .... .. .. .. .. .. .. -13 3 20 .. .. .. -13 5 21 .. .. .. .... -124 0 0 -13 29 29 17 1 46.6 1 117 46 -13 34 11 -13 24 48 -13 36 12 -13 22 47 .... -123 0 0 -14 0 20 17 1 46.7 2 117 47 -14 5 1 -13 55 39 -14 7 2 -13 53 37 0.27 -122 0 0 -14 31 9 17 1 46.9 3 117 48 -14 35 51 -14 26 28 -14 37 52 -14 24 27 0.27 -121 0 0 -15 1 58 17 1 47.1 4 117 49 -15 6 39 -14 57 16 -15 8 41 -14 55 15 0.27 -120 0 0 -15 32 44 17 1 47.4 5 116 50 -15 37 25 -15 28 2 -15 39 26 -15 26 1 0.26 -119 0 0 -16 3 26 17 1 47.8 7 116 51 -16 8 8 -15 58 45 -16 10 9 -15 56 43 0.26 -118 0 0 -16 34 4 17 1 48.3 8 116 52 -16 38 46 -16 29 23 -16 40 47 -16 27 22 0.26 -117 0 0 -17 4 38 17 1 48.8 9 116 53 -17 9 19 -16 59 56 -17 11 21 -16 57 55 0.26 -116 0 0 -17 35 5 17 1 49.3 10 115 54 -17 39 47 -17 30 24 -17 41 48 -17 28 23 0.26 -115 0 0 -18 5 26 17 1 50.0 11 115 55 -18 10 7 -18 0 45 -18 12 9 -17 58 44 0.26 -114 0 0 -18 35 39 17 1 50.7 12 115 56 -18 40 21 -18 30 58 -18 42 22 -18 28 57 0.26 -113 0 0 -19 5 44 17 1 51.4 13 114 56 -19 10 25 -19 1 3 -19 12 27 -18 59 2 0.26 -112 0 0 -19 35 40 17 1 52.3 14 114 57 -19 40 21 -19 30 59 -19 42 22 -19 28 58 0.26 -111 0 0 -20 5 26 17 1 53.1 15 114 58 -20 10 7 -20 0 45 -20 12 8 -19 58 44 0.26 -110 0 0 -20 35 1 17 1 54.1 16 113 59 -20 39 41 -20 30 20 -20 41 42 -20 28 19 0.26 -109 0 0 -21 4 24 17 1 55.1 17 113 60 -21 9 5 -20 59 44 -21 11 6 -20 57 43 0.26 -108 0 0 -21 33 36 17 1 56.1 18 112 60 -21 38 16 -21 28 56 -21 40 17 -21 26 55 0.26 -107 0 0 -22 2 34 17 1 57.2 19 112 61 -22 7 14 -21 57 54 -22 9 15 -21 55 54 0.26 -106 0 0 -22 31 19 17 1 58.4 20 112 62 -22 35 59 -22 26 39 -22 37 59 -22 24 39 0.26 -105 0 0 -22 59 49 17 1 59.6 21 111 63 -23 4 29 -22 55 10 -23 6 29 -22 53 10 0.26 -104 0 0 -23 28 5 17 2 0.9 22 111 63 -23 32 44 -23 23 26 -23 34 44 -23 21 26 0.26 -103 0 0 -23 56 5 17 2 2.2 24 110 64 -24 0 43 -23 51 26 -24 2 44 -23 49 26 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-29 32 19 17 2 23.3 36 103 69 -29 36 51 -29 27 46 -29 38 49 -29 25 49 0.26 - 89 0 0 -29 55 47 17 2 25.1 37 103 69 -30 0 19 -29 51 15 -30 2 16 -29 49 18 0.26 - 88 0 0 -30 18 53 17 2 27.0 38 102 69 -30 23 24 -30 14 21 -30 25 21 -30 12 24 0.26 - 87 0 0 -30 41 36 17 2 29.0 39 101 69 -30 46 7 -30 37 5 -30 48 3 -30 35 8 0.26 - 86 0 0 -31 3 56 17 2 30.9 40 101 69 -31 8 27 -30 59 26 -31 10 23 -30 57 30 0.26 - 85 0 0 -31 25 54 17 2 32.9 41 100 69 -31 30 23 -31 21 24 -31 32 20 -31 19 28 0.26 - 84 0 0 -31 47 28 17 2 34.9 42 99 69 -31 51 57 -31 42 59 -31 53 53 -31 41 3 0.26 - 83 0 0 -32 8 39 17 2 37.0 43 99 68 -32 13 7 -32 4 10 -32 15 3 -32 2 15 0.26 - 82 0 0 -32 29 26 17 2 39.0 44 98 68 -32 33 54 -32 24 58 -32 35 49 -32 23 3 0.26 - 81 0 0 -32 49 50 17 2 41.1 45 97 68 -32 54 17 -32 45 22 -32 56 12 -32 43 27 0.26 - 80 0 0 -33 9 49 17 2 43.2 45 96 68 -33 14 16 -33 5 23 -33 16 11 -33 3 28 0.26 - 79 0 0 -33 29 25 17 2 45.3 46 95 67 -33 33 51 -33 24 59 -33 35 46 -33 23 4 0.26 - 78 0 0 -33 48 37 17 2 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6 38.9 46 264 -4 -33 10 43 -33 1 49 -33 12 38 -32 59 54 0.26 22 0 0 -32 46 12 17 6 41.0 45 263 -5 -32 50 39 -32 41 45 -32 52 35 -32 39 49 0.26 23 0 0 -32 25 44 17 6 43.1 44 263 -5 -32 30 12 -32 21 16 -32 32 7 -32 19 21 0.26 24 0 0 -32 4 52 17 6 45.2 43 262 -6 -32 9 21 -32 0 24 -32 11 17 -31 58 28 0.26 25 0 0 -31 43 37 17 6 47.2 43 261 -7 -31 48 6 -31 39 8 -31 50 2 -31 37 12 0.26 26 0 0 -31 21 58 17 6 49.3 42 260 -8 -31 26 28 -31 17 29 -31 28 24 -31 15 32 0.26 27 0 0 -30 59 56 17 6 51.3 41 260 -9 -31 4 27 -30 55 26 -31 6 23 -30 53 30 0.26 28 0 0 -30 37 32 17 6 53.3 40 259 -10 -30 42 3 -30 33 1 -30 43 59 -30 31 4 0.26 29 0 0 -30 14 44 17 6 55.3 39 258 -11 -30 19 16 -30 10 13 -30 21 13 -30 8 16 0.26 30 0 0 -29 51 34 17 6 57.2 38 258 -12 -29 56 6 -29 47 2 -29 58 3 -29 45 5 0.26 31 0 0 -29 28 2 17 6 59.1 37 257 -13 -29 32 34 -29 23 29 -29 34 32 -29 21 32 0.26 32 0 0 -29 4 7 17 7 1.0 36 256 -14 -29 8 41 -28 59 34 -29 10 38 -28 57 37 0.26 33 0 0 -28 39 52 17 7 2.8 35 256 -15 -28 44 25 -28 35 18 -28 46 23 -28 33 20 0.26 34 0 0 -28 15 14 17 7 4.6 34 255 -16 -28 19 48 -28 10 40 -28 21 47 -28 8 42 0.27 35 0 0 -27 50 16 17 7 6.4 33 255 -17 -27 54 51 -27 45 41 -27 56 49 -27 43 43 0.27 36 0 0 -27 24 57 17 7 8.2 32 254 -18 -27 29 32 -27 20 22 -27 31 31 -27 18 23 0.27 37 0 0 -26 59 18 17 7 9.9 31 253 -19 -27 3 54 -26 54 43 -27 5 53 -26 52 44 0.27 38 0 0 -26 33 19 17 7 11.5 30 253 -20 -26 37 56 -26 28 43 -26 39 55 -26 26 44 0.27 39 0 0 -26 7 1 17 7 13.2 29 252 -21 -26 11 38 -26 2 25 -26 13 37 -26 0 26 0.27 40 0 0 -25 40 24 17 7 14.7 28 252 -22 -25 45 2 -25 35 47 -25 47 1 -25 33 48 0.27 41 0 0 -25 13 29 17 7 16.3 27 251 -23 -25 18 7 -25 8 52 -25 20 6 -25 6 52 0.27 42 0 0 -24 46 16 17 7 17.8 26 251 -24 -24 50 54 -24 41 38 -24 52 54 -24 39 38 0.27 43 0 0 -24 18 46 17 7 19.2 25 250 -25 -24 23 24 -24 14 8 -24 25 24 -24 12 8 0.27 44 0 0 -23 50 59 17 7 20.6 24 250 -26 -23 55 37 -23 46 20 -23 57 37 -23 44 20 0.27 45 0 0 -23 22 55 17 7 22.0 23 249 -27 -23 27 34 -23 18 17 -23 29 35 -23 16 16 0.27 46 0 0 -22 54 37 17 7 23.3 22 249 -28 -22 59 16 -22 49 58 -23 1 17 -22 47 57 0.27 47 0 0 -22 26 3 17 7 24.6 21 249 -29 -22 30 43 -22 21 24 -22 32 44 -22 19 23 0.27 48 0 0 -21 57 16 17 7 25.8 20 248 -30 -22 1 56 -21 52 36 -22 3 56 -21 50 35 0.27 49 0 0 -21 28 14 17 7 26.9 19 248 -31 -21 32 55 -21 23 34 -21 34 55 -21 21 34 0.27 50 0 0 -20 59 0 17 7 28.0 18 247 -32 -21 3 41 -20 54 20 -21 5 42 -20 52 19 0.28 51 0 0 -20 29 34 17 7 29.0 17 247 -33 -20 34 15 -20 24 54 -20 36 16 -20 22 53 0.28 52 0 0 -19 59 57 17 7 30.0 16 247 -34 -20 4 38 -19 55 16 -20 6 39 -19 53 15 0.28 53 0 0 -19 30 9 17 7 31.0 15 246 -35 -19 34 50 -19 25 28 -19 36 51 -19 23 27 0.28 54 0 0 -19 0 11 17 7 31.8 14 246 -36 -19 4 52 -18 55 30 -19 6 53 -18 53 29 0.28 55 0 0 -18 30 4 17 7 32.6 13 246 -38 -18 34 45 -18 25 23 -18 36 47 -18 23 21 0.28 56 0 0 -17 59 49 17 7 33.4 12 245 -39 -18 4 30 -17 55 7 -18 6 32 -17 53 6 0.29 57 0 0 -17 29 26 17 7 34.0 11 245 -40 -17 34 8 -17 24 45 -17 36 9 -17 22 44 0.29 58 0 0 -16 58 57 17 7 34.7 9 245 -41 -17 3 39 -16 54 16 -17 5 40 -16 52 15 0.29 59 0 0 -16 28 22 17 7 35.2 8 244 -42 -16 33 4 -16 23 41 -16 35 5 -16 21 40 0.30 60 0 0 -15 57 43 17 7 35.7 7 244 -43 -16 2 24 -15 53 1 -16 4 26 -15 51 0 0.30 61 0 0 -15 26 59 17 7 36.1 6 244 -44 -15 31 41 -15 22 18 -15 33 42 -15 20 16 0.31 62 0 0 -14 56 12 17 7 36.5 5 244 -45 -15 0 54 -14 51 31 -15 2 55 -14 49 30 0.32 63 0 0 -14 25 23 17 7 36.8 4 243 -46 -14 30 5 -14 20 42 -14 32 6 -14 18 41 0.34 64 0 0 -13 54 33 17 7 37.0 3 243 -47 -13 59 14 -13 49 52 -14 1 16 -13 47 51 0.37 65 0 0 -13 23 42 17 7 37.1 2 243 -48 -13 28 23 -13 19 1 -13 30 25 -13 17 0 0.43 66 0 0 -12 52 52 17 7 37.2 1 243 -49 -12 57 33 -12 48 11 -12 59 34 -12 46 10 0.70 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: TYC 6819-05013-1 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 05 30.6487 DE: -26 51 11.362 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 05 30.6486 DE: -26 51 11.362 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 10.5 * B mag [mag]: 11.2 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (7941) 1991 NE1 asteroid class: approx. diameter [km]: 15 approx. diameter ["]: 0.005 distance from Earth [AU]: 3.78200 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#48 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): 0.016", 0.001", 88.7° remarks: * orbital elements for (7941)1991 NE1 : Mean anomaly = 244.8731012810 deg Arg. of pericenter = 86.4512848353 deg Long. of node = 304.3743905053 deg Inclination = 8.5473360222 deg Eccentricity = 0.0435663819 Semimajor axis = 3.1774914927 AU Perihelion dist = 3.0390596849 AU Mag: H = 12.92, G = 0.15 Epoch of elements : MJD 60603.71159463 TDT (2024 Oct 20.7116) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#482023Apr25,0.42,2024,10,20,17.078275,0.000416,-0.246115,19.899017,0.083191,0.004500,-0.000676,-0.000001,0.000000 -29.0639,-26.8876,-80.01,-10.69,False TYC 6819-05013-1,17.09184690,-26.8531561,11.19,10.53,10.17,0.1,0,,17.11721124,-26.8876237,8.61,8.52,0,0,0 7941,1991 NE1,19.14,14.800,3.7820,0,0,3.459,0.20,,1.4,0 0,244.7493,2024,10,20,86.4513,304.3744,8.5473,0.04357,3.17749,3.03906,12.91,5.0,0.15 1.216,0.0163,0.0011,89,0.0012,Known errors,0.83,0,-1,-1 20241020_5013-1,60140.65 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:34 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org