IOTA/IOTA-ES occultation update for (2127) Tanya / UCAC4 340-130687 event on 2023 Jul 25, 11:47 UT Visible from N Australia Summary ------- On 2023 Jul 25 UT, the 39.1 km diameter asteroid (2127) Tanya will occult a 11.7 mag star in the constellation Sagittarius for observers along a path across N Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.35 mag to 15.99 mag (the magnitude of the asteroid) for at most 3.860 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: 78 * date and approx. time of event: 2023 Jul 25, 11:36 - 2023 Jul 25, 11:57 * geocentric midpoint of event [JD]: 2460150.99111534 * magnitude of target star: 11.66 * magnitude drop [mag]: 4.35 * estimated maximum duration [s]: 3.860 * Moon: 46 % sunlit, 66° distance * Sun: 152° distance * rough path description: N Australia The occultation path -------------------- * approximate projected width [km]: 40 * 1 sigma uncertainty interval [path widths]: +/- 0.70 * 1 sigma uncertainty interval [seconds]: +/- 3.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.028, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.029", 0.001", 101°) * approx speed of asteroid's shadow [km/s]: 10.1276 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 340-130687 by 2127 Tanya on 2023 Jul 25 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 57 0 0 -12 23 53 11 57 27.3 0 113 27 .. .. .. -12 35 41 .. .. .. -12 52 13 .... 58 0 0 -12 48 12 11 57 27.1 1 112 26 -12 36 26 -12 59 58 -12 19 55 -13 16 26 -0.01 59 0 0 -13 11 56 11 57 26.8 2 112 25 -13 0 12 -13 23 39 -12 43 44 -13 40 4 -0.12 60 0 0 -13 35 3 11 57 26.3 3 112 24 -13 23 21 -13 46 44 -13 6 57 -14 3 6 -0.16 61 0 0 -13 57 34 11 57 25.5 4 112 23 -13 45 55 -14 9 13 -13 29 34 -14 25 31 -0.18 62 0 0 -14 19 29 11 57 24.5 5 112 22 -14 7 53 -14 31 6 -13 51 35 -14 47 21 -0.19 63 0 0 -14 40 49 11 57 23.4 6 111 21 -14 29 14 -14 52 23 -14 12 59 -15 8 35 -0.20 64 0 0 -15 1 32 11 57 22.0 7 111 20 -14 50 0 -15 13 4 -14 33 48 -15 29 13 -0.20 65 0 0 -15 21 40 11 57 20.4 8 111 19 -15 10 9 -15 33 9 -14 54 1 -15 49 15 -0.21 66 0 0 -15 41 11 11 57 18.7 9 111 18 -15 29 43 -15 52 39 -15 13 38 -16 8 42 -0.21 67 0 0 -16 0 8 11 57 16.7 10 110 17 -15 48 42 -16 11 33 -15 32 39 -16 27 33 -0.21 68 0 0 -16 18 28 11 57 14.6 11 110 16 -16 7 4 -16 29 52 -15 51 4 -16 45 49 -0.22 69 0 0 -16 36 14 11 57 12.3 12 110 15 -16 24 52 -16 47 36 -16 8 55 -17 3 30 -0.22 70 0 0 -16 53 24 11 57 9.9 13 109 14 -16 42 4 -17 4 44 -16 26 9 -17 20 36 -0.22 71 0 0 -17 9 59 11 57 7.2 14 109 13 -16 58 41 -17 21 17 -16 42 49 -17 37 7 -0.22 72 0 0 -17 26 0 11 57 4.4 15 109 12 -17 14 43 -17 37 16 -16 58 54 -17 53 3 -0.22 73 0 0 -17 41 25 11 57 1.4 16 109 11 -17 30 10 -17 52 40 -17 14 23 -18 8 24 -0.22 74 0 0 -17 56 16 11 56 58.2 17 108 10 -17 45 3 -18 7 29 -17 29 18 -18 23 11 -0.22 75 0 0 -18 10 33 11 56 54.9 18 108 9 -17 59 21 -18 21 44 -17 43 39 -18 37 24 -0.22 76 0 0 -18 24 15 11 56 51.4 19 108 8 -18 13 5 -18 35 25 -17 57 25 -18 51 2 -0.22 77 0 0 -18 37 23 11 56 47.8 20 107 8 -18 26 14 -18 48 31 -18 10 36 -19 4 7 -0.22 78 0 0 -18 49 57 11 56 44.0 21 107 7 -18 38 50 -19 1 4 -18 23 14 -19 16 38 -0.22 79 0 0 -19 1 57 11 56 40.1 22 107 6 -18 50 51 -19 13 3 -18 35 17 -19 28 35 -0.22 80 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44 224 -59 11 39 51 11 13 47 11 58 9 10 55 33 -0.24 -170 0 0 12 5 34 11 39 49.2 43 224 -58 12 18 37 11 52 32 12 36 57 11 34 17 -0.24 -169 0 0 12 44 21 11 39 40.6 41 224 -57 12 57 25 12 31 18 13 15 45 12 13 2 -0.24 -168 0 0 13 23 7 11 39 32.3 40 225 -57 13 36 11 13 10 3 13 54 32 12 51 46 -0.24 -167 0 0 14 1 51 11 39 24.1 39 225 -56 14 14 56 13 48 47 14 33 18 13 30 30 -0.24 -166 0 0 14 40 33 11 39 16.1 38 226 -55 14 53 38 14 27 28 15 12 0 14 9 10 -0.24 -165 0 0 15 19 10 11 39 8.3 37 226 -54 15 32 15 15 6 5 15 50 38 14 47 47 -0.24 -164 0 0 15 57 42 11 39 0.8 36 226 -53 16 10 47 15 44 37 16 29 10 15 26 19 -0.24 -163 0 0 16 36 7 11 38 53.4 35 227 -53 16 49 13 16 23 2 17 7 36 16 4 44 -0.24 -162 0 0 17 14 25 11 38 46.3 34 227 -52 17 27 30 17 1 20 17 45 53 16 43 1 -0.24 -161 0 0 17 52 33 11 38 39.5 33 228 -51 18 5 39 17 39 29 18 24 1 17 21 10 -0.24 -160 0 0 18 30 32 11 38 32.8 31 228 -50 18 43 37 18 17 27 19 1 59 17 59 9 -0.24 -159 0 0 19 8 19 11 38 26.4 30 228 -49 19 21 24 18 55 15 19 39 45 18 36 57 -0.24 -158 0 0 19 45 53 11 38 20.2 29 229 -48 19 58 58 19 32 50 20 17 19 19 14 33 -0.24 -157 0 0 20 23 14 11 38 14.2 28 229 -47 20 36 18 20 10 11 20 54 38 19 51 55 -0.24 -156 0 0 21 0 20 11 38 8.5 27 230 -46 21 13 24 20 47 18 21 31 43 20 29 3 -0.24 -155 0 0 21 37 11 11 38 3.0 26 230 -45 21 50 13 21 24 9 22 8 31 21 5 55 -0.24 -154 0 0 22 13 44 11 37 57.7 25 230 -44 22 26 46 22 0 44 22 45 3 21 42 31 -0.24 -153 0 0 22 50 0 11 37 52.7 24 231 -43 23 3 1 22 37 0 23 21 16 22 18 49 -0.24 -152 0 0 23 25 57 11 37 47.9 23 231 -42 23 38 56 23 12 58 23 57 10 22 54 48 -0.24 -151 0 0 24 1 34 11 37 43.4 22 232 -42 24 14 32 23 48 37 24 32 45 23 30 28 -0.24 -150 0 0 24 36 50 11 37 39.0 21 232 -41 24 49 47 24 23 54 25 7 58 24 5 48 -0.24 -149 0 0 25 11 45 11 37 34.9 20 233 -40 25 24 41 24 58 50 25 42 49 24 40 46 -0.24 -148 0 0 25 46 17 11 37 31.1 18 233 -39 25 59 12 25 33 24 26 17 18 25 15 21 -0.24 -147 0 0 26 20 26 11 37 27.5 17 234 -38 26 33 19 26 7 35 26 51 24 25 49 34 -0.24 -146 0 0 26 54 11 11 37 24.1 16 234 -37 27 7 3 26 41 21 27 25 5 26 23 23 -0.24 -145 0 0 27 27 32 11 37 20.9 15 234 -36 27 40 21 27 14 43 27 58 21 26 56 47 -0.24 -144 0 0 28 0 27 11 37 17.9 14 235 -35 28 13 14 27 47 40 28 31 12 27 29 46 -0.24 -143 0 0 28 32 55 11 37 15.2 13 235 -34 28 45 41 28 20 10 29 3 36 28 2 19 -0.24 -142 0 0 29 4 58 11 37 12.7 12 236 -33 29 17 41 28 52 14 29 35 33 28 34 26 -0.24 -141 0 0 29 36 32 11 37 10.4 11 236 -32 29 49 14 29 23 51 30 7 4 29 6 6 -0.24 -140 0 0 30 7 39 11 37 8.3 10 237 -31 30 20 19 29 55 0 30 38 6 29 37 18 -0.24 -139 0 0 30 38 18 11 37 6.4 9 237 -30 30 50 56 30 25 41 31 8 40 30 8 1 -0.24 -138 0 0 31 8 28 11 37 4.7 8 238 -29 31 21 4 30 55 53 31 38 44 30 38 16 -0.24 -137 0 0 31 38 9 11 37 3.2 7 238 -29 31 50 43 31 25 37 32 8 20 31 8 3 -0.24 -136 0 0 32 7 21 11 37 2.0 6 239 -28 32 19 52 31 54 50 32 37 26 31 37 20 -0.23 -135 0 0 32 36 2 11 37 0.9 5 240 -27 32 48 31 32 23 34 33 6 2 32 6 7 -0.23 -134 0 0 33 4 14 11 37 0.0 4 240 -26 33 16 41 32 51 48 33 34 8 32 34 24 -0.23 -133 0 0 33 31 55 11 36 59.3 3 241 -25 33 44 19 33 19 32 34 1 44 33 2 10 -0.23 -132 0 0 33 59 6 11 36 58.7 2 241 -24 34 11 28 33 46 44 34 28 49 33 29 27 -0.22 -131 0 0 34 25 45 11 36 58.4 2 242 -23 34 38 5 34 13 27 34 55 23 33 56 12 -0.21 -130 0 0 34 51 54 11 36 58.2 1 242 -22 35 4 11 34 39 38 35 21 26 34 22 27 -0.17 Uncertainty in time = +/- 4 secs Prediction of 2023 May 29.0 Data for the target star ------------------------ * name: UCAC4 340-130687 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 16 00.9776 DE: -22 08 42.164 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 16 00.9776 DE: -22 08 42.164 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.7 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2127) Tanya asteroid class: approx. diameter [km]: 39 approx. diameter ["]: 0.025 distance from Earth [AU]: 2.17970 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#55 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): 0.029", 0.001", 101.414° remarks: * orbital elements for (2127)Tanya : Mean anomaly = 348.0955102683 deg Arg. of pericenter = 188.8305219383 deg Long. of node = 106.3556709045 deg Inclination = 13.0941150349 deg Eccentricity = 0.0314532093 Semimajor axis = 3.2102340511 AU Perihelion dist = 3.1092618875 AU Mag: H = 11.24, G = 0.15 Epoch of elements : MJD 60150.49104167 TDT (2023 Jul 25.4910) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#552023Apr24,3.86,2023,7,25,11.786768,-0.093734,0.194249,-5.148340,-2.484048,0.002701,-0.000025,0.000001,0.000000 154.6296,-22.1375,4.85,19.64,False UCAC4 340-130687,18.26693823,-22.1450456,0.00,11.66,0.00,0.0,0,,18.29082220,-22.1374963,4.35,0.00,0,0,0 2127,Tanya,15.99,39.1,2.1797,0,0,-1.494,-10.02,,2.4,0 0,348.0114,2023,7,25,188.8305,106.3557,13.0941,0.03145,3.21023,3.10926,11.23,5.0,0.15 1.701,0.0287,0.0007,101,0.0173,Known errors,-1.00,-1,-1,-1 20230725_130687,60092.99 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 May 28, 23:40 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org