IOTA/IOTA-ES occultation update for (175) Andromache / UCAC4 583-020020 event on 2023 Apr 02, 03:39 UT Visible from E Canada Summary ------- On 2023 Apr 02 UT, the 99.7 km diameter asteroid (175) Andromache will occult a 12.4 mag star in the constellation Taurus for observers along a path across E Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.62 mag to 14.96 mag (the magnitude of the asteroid) for at most 4.550 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: 100 * date and approx. time of event: 2023 Apr 02, 03:35 - 2023 Apr 02, 03:43 * geocentric midpoint of event [JD]: 2460036.65236513 * magnitude of target star: 12.44 * magnitude drop [mag]: 2.62 * estimated maximum duration [s]: 4.550 * Moon: 84 % sunlit, 57° distance * Sun: 76° distance * rough path description: E Canada The occultation path -------------------- * approximate projected width [km]: 138 * 1 sigma uncertainty interval [path widths]: +/- 0.06 * 1 sigma uncertainty interval [seconds]: +/- 1.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.015", 0.002", 88°) * approx speed of asteroid's shadow [km/s]: 21.9093 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 583-020020 by 175 Andromache on 2023 Apr 2 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 89 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 41 14 23 .. .. .. 41 19 45 .... 90 0 0 41 0 48 3 35 54.2 1 55 41 40 14 33 41 47 48 40 9 20 41 53 11 .... 91 0 0 41 34 6 3 35 54.4 2 55 41 40 47 42 42 21 15 40 42 29 42 26 39 -0.86 92 0 0 42 7 24 3 35 54.7 3 56 41 41 20 52 42 54 42 41 15 38 43 0 7 -0.90 93 0 0 42 40 42 3 35 55.1 4 57 42 41 54 2 43 28 8 41 48 47 43 33 34 -0.92 94 0 0 43 13 57 3 35 55.6 5 58 42 42 27 10 44 1 31 42 21 54 44 6 58 -0.93 95 0 0 43 47 9 3 35 56.1 6 58 42 43 0 15 44 34 50 42 54 58 44 40 18 -0.94 96 0 0 44 20 17 3 35 56.8 6 59 42 43 33 16 45 8 5 43 27 59 45 13 34 -0.94 97 0 0 44 53 18 3 35 57.6 7 60 42 44 6 11 45 41 13 44 0 53 45 46 43 -0.95 98 0 0 45 26 13 3 35 58.5 8 60 42 44 39 0 46 14 14 44 33 42 46 19 44 -0.95 99 0 0 45 59 0 3 35 59.4 9 61 42 45 11 42 46 47 5 45 6 22 46 52 36 -0.95 100 0 0 46 31 36 3 36 0.5 10 62 42 45 44 14 47 19 47 45 38 54 47 25 18 -0.95 101 0 0 47 4 2 3 36 1.6 11 63 42 46 16 35 47 52 18 46 11 15 47 57 49 -0.95 102 0 0 47 36 16 3 36 2.8 12 63 42 46 48 46 48 24 35 46 43 25 48 30 8 -0.96 103 0 0 48 8 17 3 36 4.1 13 64 42 47 20 44 48 56 40 47 15 23 49 2 12 -0.96 104 0 0 48 40 4 3 36 5.4 13 65 42 47 52 28 49 28 29 47 47 7 49 34 2 -0.96 105 0 0 49 11 36 3 36 6.9 14 66 42 48 23 58 50 0 3 48 18 36 50 5 36 -0.96 106 0 0 49 42 51 3 36 8.4 15 67 42 48 55 11 50 31 19 48 49 50 50 36 53 -0.96 107 0 0 50 13 49 3 36 9.9 16 67 42 49 26 8 51 2 18 49 20 47 51 7 52 -0.96 108 0 0 50 44 28 3 36 11.6 17 68 41 49 56 48 51 32 58 49 51 26 51 38 32 -0.96 109 0 0 51 14 49 3 36 13.2 17 69 41 50 27 8 52 3 18 50 21 47 52 8 52 -0.96 110 0 0 51 44 49 3 36 15.0 18 70 41 50 57 10 52 33 17 50 51 48 52 38 51 -0.96 111 0 0 52 14 28 3 36 16.8 19 71 41 51 26 50 53 2 55 51 21 29 53 8 28 -0.96 112 0 0 52 43 46 3 36 18.6 20 72 41 51 56 10 53 32 11 51 50 49 53 37 44 -0.96 113 0 0 53 12 41 3 36 20.5 20 73 40 52 25 8 54 1 3 52 19 47 54 6 36 -0.96 114 0 0 53 41 13 3 36 22.4 21 74 40 52 53 43 54 29 32 52 48 23 54 35 4 -0.96 115 0 0 54 9 22 3 36 24.3 22 74 40 53 21 55 54 57 37 53 16 35 55 3 9 -0.96 116 0 0 54 37 6 3 36 26.3 22 75 39 53 49 44 55 25 16 53 44 24 55 30 48 -0.96 117 0 0 55 4 25 3 36 28.4 23 76 39 54 17 8 55 52 31 54 11 49 55 58 1 -0.96 118 0 0 55 31 19 3 36 30.4 24 77 39 54 44 7 56 19 19 54 38 48 56 24 49 -0.96 119 0 0 55 57 47 3 36 32.5 24 78 39 55 10 41 56 45 41 55 5 23 56 51 11 -0.96 120 0 0 56 23 49 3 36 34.6 25 79 38 55 36 49 57 11 37 55 31 32 57 17 5 -0.96 121 0 0 56 49 25 3 36 36.7 26 80 38 56 2 31 57 37 5 55 57 15 57 42 33 -0.96 122 0 0 57 14 34 3 36 38.9 26 81 37 56 27 47 58 2 7 56 22 32 58 7 34 -0.96 123 0 0 57 39 16 3 36 41.0 27 82 37 56 52 37 58 26 41 56 47 22 58 32 7 -0.96 124 0 0 58 3 30 3 36 43.2 27 83 37 57 16 59 58 50 47 57 11 45 58 56 12 -0.96 125 0 0 58 27 18 3 36 45.4 28 84 36 57 40 55 59 14 26 57 35 42 59 19 50 -0.96 126 0 0 58 50 38 3 36 47.6 29 85 36 58 4 24 59 37 36 57 59 11 59 42 59 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48 31 42 -1.00 - 66 0 0 47 5 28 3 42 34.0 18 290 -37 46 17 59 47 53 46 46 12 39 47 59 18 -1.00 - 65 0 0 46 32 57 3 42 35.9 17 291 -38 45 45 32 47 21 10 45 40 12 47 26 42 -1.01 - 64 0 0 46 0 14 3 42 37.7 16 291 -39 45 12 54 46 48 23 45 7 34 46 53 54 -1.01 - 63 0 0 45 27 22 3 42 39.4 15 292 -39 44 40 6 46 15 25 44 34 47 46 20 56 -1.01 - 62 0 0 44 54 21 3 42 41.1 15 293 -40 44 7 11 45 42 18 44 1 53 45 47 48 -1.01 - 61 0 0 44 21 13 3 42 42.6 14 294 -41 43 34 9 45 9 4 43 28 51 45 14 33 -1.02 - 60 0 0 43 47 58 3 42 44.1 13 295 -41 43 1 1 44 35 43 42 55 44 44 41 11 -1.02 - 59 0 0 43 14 40 3 42 45.5 12 295 -42 42 27 49 44 2 17 42 22 33 44 7 44 -1.03 - 58 0 0 42 41 17 3 42 46.8 11 296 -43 41 54 35 43 28 47 41 49 19 43 34 13 -1.03 - 57 0 0 42 7 53 3 42 48.0 10 297 -43 41 21 18 42 55 14 41 16 3 43 0 39 -1.04 - 56 0 0 41 34 28 3 42 49.1 9 297 -44 40 48 1 42 21 40 40 42 47 42 27 4 -1.05 - 55 0 0 41 1 3 3 42 50.1 8 298 -44 40 14 44 41 48 6 40 9 32 41 53 30 -1.05 - 54 0 0 40 27 40 3 42 51.0 7 299 -45 39 41 30 41 14 34 39 36 19 41 19 56 -1.07 - 53 0 0 39 54 20 3 42 51.9 6 299 -45 39 8 19 40 41 4 39 3 9 40 46 25 -1.08 - 52 0 0 39 21 4 3 42 52.6 5 300 -46 38 35 13 40 7 39 38 30 4 40 12 59 -1.10 - 51 0 0 38 47 54 3 42 53.1 4 301 -46 38 2 13 39 34 18 37 57 4 39 39 37 -1.13 - 50 0 0 38 14 51 3 42 53.6 4 301 -47 37 29 20 39 1 5 37 24 12 39 6 22 -1.17 - 49 0 0 37 41 56 3 42 54.0 3 302 -47 36 56 35 38 27 59 36 51 29 38 33 15 -1.25 - 48 0 0 37 9 10 3 42 54.3 2 303 -48 36 24 0 37 55 2 36 18 55 38 0 18 -1.42 - 47 0 0 36 36 35 3 42 54.4 1 303 -48 35 51 35 37 22 16 35 46 31 37 27 30 -2.13 - 46 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 36 49 41 .. .. .. 36 54 54 .... Uncertainty in time = +/- 2 secs Prediction of 2023 Feb 15.9 Data for the target star ------------------------ * name: UCAC4 583-020020 * constellation : Taurus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 05 51 36.2568 DE: +26 32 02.271 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 05 51 36.2566 DE: +26 32 02.271 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (175) Andromache asteroid class: approx. diameter [km]: 100 approx. diameter ["]: 0.039 distance from Earth [AU]: 3.55170 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#69 date of fit: 2023 Feb 07 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): 0.015", 0.002", 88.24° remarks: * orbital elements for (175)Andromache : Mean anomaly = 99.0576893735 deg Arg. of pericenter = 319.7443118323 deg Long. of node = 21.2695054557 deg Inclination = 3.2192387569 deg Eccentricity = 0.2325532330 Semimajor axis = 3.1836782568 AU Perihelion dist = 2.4433035854 AU Mag: H = 8.61, G = 0.15 Epoch of elements : MJD 60036.15236111 TDT (2023 Apr 02.1524) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#692023Feb07,4.55,2023,4,2,3.656763,0.030932,0.689561,12.354001,-0.548990,0.005692,0.000143,0.000000,0.000000 -156.8253,26.5408,126.09,4.80,False UCAC4 583-020020,5.86007135,26.5339642,0.00,12.44,0.00,0.0,0,,5.88393428,26.5407757,2.62,0.00,0,0,0 175,Andromache,14.96,99.7,3.5517,0,0,2.279,-1.36,,5.8,0 0,99.0313,2023,4,2,319.7443,21.2695,3.2192,0.23255,3.18368,2.44330,8.64,5.0,0.15 1.057,0.0147,0.0019,88,0.0022,Known errors,-1.00,-1,-1,-1 20230402_020020,59990.87 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Feb 15, 20:55 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org