IOTA/IOTA-ES occultation update for (1271) Isergina / TYC 4971-01081-1 event on 2023 Jan 18, 16:31 UT Visible from New Zealand, Australia Summary ------- On 2023 Jan 18 UT, the 50 km diameter asteroid (1271) Isergina will occult a 10.8 mag star in the constellation Virgo for observers along a path across New Zealand, Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.86 mag to 16.64 mag (the magnitude of the asteroid) for at most 3.390 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: 2023 Jan 18, 16:25 - 2023 Jan 18, 16:37 * geocentric midpoint of event [JD]: 2459963.18828675 * magnitude of target star: 10.78 * magnitude drop [mag]: 5.86 * estimated maximum duration [s]: 3.390 * Moon: 15 % sunlit, 45° distance * Sun: 90° distance * rough path description: New Zealand, Australia The occultation path -------------------- * approximate projected width [km]: 63 * 1 sigma uncertainty interval [path widths]: +/- 0.18 * 1 sigma uncertainty interval [seconds]: +/- 2.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.001", 110°) * approx speed of asteroid's shadow [km/s]: 14.7469 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4971-01081-1 by 1271 Isergina on 2023 Jan 18 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 112 0 0 -31 12 43 16 25 26.3 1 95 -38 -31 29 59 -30 55 31 -31 36 14 -30 49 19 .... 113 0 0 -31 18 6 16 25 26.4 1 95 -38 -31 35 22 -31 0 54 -31 41 37 -30 54 42 0.58 114 0 0 -31 23 37 16 25 26.7 2 94 -38 -31 40 53 -31 6 25 -31 47 9 -31 0 13 0.65 115 0 0 -31 29 16 16 25 27.1 3 94 -38 -31 46 32 -31 12 3 -31 52 48 -31 5 51 0.68 116 0 0 -31 35 2 16 25 27.6 4 93 -38 -31 52 19 -31 17 49 -31 58 35 -31 11 37 0.70 117 0 0 -31 40 55 16 25 28.3 5 93 -38 -31 58 13 -31 23 42 -32 4 29 -31 17 30 0.72 118 0 0 -31 46 57 16 25 29.0 6 92 -38 -32 4 14 -31 29 43 -32 10 30 -31 23 30 0.72 119 0 0 -31 53 5 16 25 29.9 7 92 -38 -32 10 23 -31 35 51 -32 16 39 -31 29 38 0.73 120 0 0 -31 59 20 16 25 30.9 7 91 -38 -32 16 38 -31 42 6 -32 22 55 -31 35 53 0.74 121 0 0 -32 5 42 16 25 32.1 8 91 -37 -32 23 1 -31 48 28 -32 29 17 -31 42 15 0.74 122 0 0 -32 12 12 16 25 33.3 9 90 -37 -32 29 31 -31 54 57 -32 35 47 -31 48 44 0.74 123 0 0 -32 18 48 16 25 34.7 10 90 -37 -32 36 7 -32 1 32 -32 42 23 -31 55 19 0.75 124 0 0 -32 25 30 16 25 36.2 11 89 -37 -32 42 49 -32 8 15 -32 49 6 -32 2 1 0.75 125 0 0 -32 32 19 16 25 37.8 12 88 -36 -32 49 39 -32 15 3 -32 55 55 -32 8 50 0.75 126 0 0 -32 39 14 16 25 39.5 13 88 -36 -32 56 34 -32 21 58 -33 2 51 -32 15 44 0.75 127 0 0 -32 46 15 16 25 41.3 13 87 -36 -33 3 36 -32 28 59 -33 9 53 -32 22 45 0.75 128 0 0 -32 53 23 16 25 43.3 14 87 -36 -33 10 43 -32 36 6 -33 17 1 -32 29 52 0.76 129 0 0 -33 0 36 16 25 45.4 15 86 -35 -33 17 57 -32 43 19 -33 24 14 -32 37 5 0.76 130 0 0 -33 7 55 16 25 47.5 16 86 -35 -33 25 16 -32 50 37 -33 31 33 -32 44 23 0.76 131 0 0 -33 15 19 16 25 49.8 17 85 -35 -33 32 41 -32 58 1 -33 38 58 -32 51 47 0.76 132 0 0 -33 22 49 16 25 52.2 18 84 -34 -33 40 11 -33 5 31 -33 46 28 -32 59 17 0.76 133 0 0 -33 30 24 16 25 54.8 18 84 -34 -33 47 46 -33 13 5 -33 54 4 -33 6 51 0.76 134 0 0 -33 38 4 16 25 57.4 19 83 -33 -33 55 26 -33 20 45 -34 1 44 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147 0 0 -35 24 8 16 26 40.8 30 74 -27 -35 41 33 -35 6 46 -35 47 52 -35 0 31 0.77 148 0 0 -35 32 41 16 26 44.8 30 73 -26 -35 50 6 -35 15 19 -35 56 25 -35 9 4 0.77 149 0 0 -35 41 16 16 26 48.9 31 72 -26 -35 58 42 -35 23 54 -36 5 1 -35 17 39 0.77 150 0 0 -35 49 54 16 26 53.1 32 71 -25 -36 7 20 -35 32 32 -36 13 39 -35 26 16 0.77 151 0 0 -35 58 34 16 26 57.3 33 71 -25 -36 16 0 -35 41 11 -36 22 19 -35 34 56 0.77 152 0 0 -36 7 15 16 27 1.7 33 70 -24 -36 24 41 -35 49 53 -36 31 1 -35 43 37 0.77 153 0 0 -36 15 58 16 27 6.1 34 69 -23 -36 33 25 -35 58 36 -36 39 44 -35 52 20 0.77 154 0 0 -36 24 43 16 27 10.6 35 68 -23 -36 42 10 -36 7 21 -36 48 29 -36 1 5 0.77 155 0 0 -36 33 29 16 27 15.1 35 67 -22 -36 50 56 -36 16 7 -36 57 15 -36 9 51 0.77 156 0 0 -36 42 16 16 27 19.8 36 66 -21 -36 59 43 -36 24 54 -37 6 2 -36 18 38 0.77 157 0 0 -36 51 4 16 27 24.5 37 65 -21 -37 8 31 -36 33 42 -37 14 50 -36 27 26 0.77 158 0 0 -36 59 53 16 27 29.2 37 64 -20 -37 17 20 -36 42 30 -37 23 39 -36 36 14 0.77 159 0 0 -37 8 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16 35 2.5 35 305 42 -46 4 38 -45 30 28 -46 10 50 -45 24 19 0.78 -115 0 0 -45 48 51 16 35 6.4 35 304 43 -46 5 58 -45 31 48 -46 12 10 -45 25 39 0.78 -114 0 0 -45 50 2 16 35 10.3 34 303 44 -46 7 9 -45 33 0 -46 13 21 -45 26 51 0.78 -113 0 0 -45 51 6 16 35 14.0 33 302 44 -46 8 13 -45 34 3 -46 14 25 -45 27 54 0.78 -112 0 0 -45 52 1 16 35 17.7 33 301 45 -46 9 8 -45 34 59 -46 15 20 -45 28 50 0.78 -111 0 0 -45 52 49 16 35 21.4 32 300 46 -46 9 55 -45 35 46 -46 16 8 -45 29 38 0.78 -110 0 0 -45 53 28 16 35 24.9 32 299 46 -46 10 35 -45 36 26 -46 16 47 -45 30 17 0.78 -109 0 0 -45 54 0 16 35 28.4 31 298 47 -46 11 6 -45 36 57 -46 17 18 -45 30 48 0.78 -108 0 0 -45 54 23 16 35 31.9 30 297 48 -46 11 29 -45 37 20 -46 17 41 -45 31 11 0.78 -107 0 0 -45 54 38 16 35 35.3 30 296 48 -46 11 44 -45 37 35 -46 17 57 -45 31 27 0.78 -106 0 0 -45 54 45 16 35 38.6 29 295 49 -46 11 52 -45 37 42 -46 18 4 -45 31 34 0.78 -105 0 0 -45 54 44 16 35 41.8 28 295 49 -46 11 51 -45 37 41 -46 18 3 -45 31 33 0.78 -104 0 0 -45 54 35 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36 39.7 12 275 63 -45 28 35 -44 54 17 -45 34 49 -44 48 7 0.80 - 79 0 0 -45 8 0 16 36 41.1 11 274 63 -45 25 12 -44 50 53 -45 31 25 -44 44 43 0.80 - 78 0 0 -45 4 29 16 36 42.3 10 273 64 -45 21 40 -44 47 21 -45 27 54 -44 41 11 0.80 - 77 0 0 -45 0 50 16 36 43.5 9 272 64 -45 18 2 -44 43 42 -45 24 16 -44 37 32 0.80 - 76 0 0 -44 57 4 16 36 44.6 9 272 64 -45 14 16 -44 39 56 -45 20 30 -44 33 45 0.81 - 75 0 0 -44 53 11 16 36 45.6 8 271 65 -45 10 23 -44 36 2 -45 16 37 -44 29 52 0.81 - 74 0 0 -44 49 10 16 36 46.5 7 270 65 -45 6 23 -44 32 2 -45 12 37 -44 25 51 0.82 - 73 0 0 -44 45 3 16 36 47.3 7 270 65 -45 2 16 -44 27 54 -45 8 30 -44 21 43 0.82 - 72 0 0 -44 40 48 16 36 48.0 6 269 65 -44 58 1 -44 23 39 -45 4 16 -44 17 27 0.83 - 71 0 0 -44 36 26 16 36 48.7 5 268 66 -44 53 40 -44 19 17 -44 59 55 -44 13 5 0.83 - 70 0 0 -44 31 58 16 36 49.3 4 267 66 -44 49 12 -44 14 48 -44 55 26 -44 8 36 0.85 - 69 0 0 -44 27 22 16 36 49.8 4 267 66 -44 44 36 -44 10 12 -44 50 51 -44 4 0 0.86 - 68 0 0 -44 22 40 16 36 50.2 3 266 66 -44 39 54 -44 5 29 -44 46 9 -43 59 17 0.88 - 67 0 0 -44 17 51 16 36 50.5 2 265 66 -44 35 6 -44 0 40 -44 41 21 -43 54 28 0.92 - 66 0 0 -44 12 55 16 36 50.7 2 265 66 -44 30 10 -43 55 43 -44 36 25 -43 49 32 0.98 - 65 0 0 -44 7 52 16 36 50.9 1 264 66 -44 25 8 -43 50 41 -44 31 23 -43 44 29 1.16 - 64 0 0 -44 2 43 16 36 51.0 0 263 66 -44 19 59 -43 45 31 -44 26 15 -43 39 19 3.38 Uncertainty in time = +/- 3 secs Prediction of 2022 Dec 1.1 Data for the target star ------------------------ * name: TYC 4971-01081-1 * constellation : Virgo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 13 52 36.4247 DE: -04 49 56.882 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 13 52 36.4251 DE: -04 49 56.884 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1271) Isergina asteroid class: approx. diameter [km]: 50 approx. diameter ["]: 0.021 distance from Earth [AU]: 3.32340 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#58 date of fit: 2022 Nov 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", 109.765° remarks: * orbital elements for (1271)Isergina : Mean anomaly = 145.5532138012 deg Arg. of pericenter = 272.1185915827 deg Long. of node = 126.8349171208 deg Inclination = 6.6820260869 deg Eccentricity = 0.1210058247 Semimajor axis = 3.1414858132 AU Perihelion dist = 2.7613477316 AU Mag: H = 10.45, G = 0.15 Epoch of elements : MJD 59962.68833333 TDT (2023 Jan 18.6883) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#582022Nov25,3.39,2023,1,18,16.518882,-0.070287,-0.604995,8.270820,-0.935318,-0.005716,0.002152,0.000000,0.000000 -157.1571,-4.9460,-65.19,-20.50,False TYC 4971-01081-1,13.87678463,-4.8324671,0.00,10.78,0.00,0.0,0,,13.89662405,-4.9459609,5.87,0.00,0,0,0 1271,Isergina,16.64,50.0,3.3234,0,0,1.465,-2.48,,2.2,0 0,145.4314,2023,1,18,272.1186,126.8349,6.6820,0.12101,3.14149,2.76135,10.45,5.0,0.15 1.181,0.0157,0.0011,110,0.0037,Known errors,-1.00,-1,-1,-1 20230118_1081-1,59914.09 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Dec 01, 02:14 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org