IOTA/IOTA-ES occultation update for (1765) Wrubel / TYC 7425-01944-1 event on 2023 Apr 27, 18:55 UT Visible from Australia Summary ------- On 2023 Apr 27 UT, the 41.3 km diameter asteroid (1765) Wrubel will occult a 10.7 mag star in the constellation Sagittarius for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.51 mag to 15.20 mag (the magnitude of the asteroid) for at most 3.100 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: 85 * date and approx. time of event: 2023 Apr 27, 18:47 - 2023 Apr 27, 19:03 * geocentric midpoint of event [JD]: 2460062.28834671 * magnitude of target star: 10.71 * magnitude drop [mag]: 4.51 * estimated maximum duration [s]: 3.100 * Moon: 49 % sunlit, 165° distance * Sun: 106° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 43 * 1 sigma uncertainty interval [path widths]: +/- 0.60 * 1 sigma uncertainty interval [seconds]: +/- 3.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.029, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.029", 0.004", 96°) * approx speed of asteroid's shadow [km/s]: 13.3089 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7425-01944-1 by 1765 Wrubel on 2023 Apr 27 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 76 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. 15 17 50 .. .. .. .... 77 0 0 15 12 9 18 47 33.7 1 122 -61 14 58 17 15 25 59 14 41 31 15 42 41 .... 78 0 0 14 35 4 18 47 34.0 2 122 -62 14 21 6 14 49 0 14 4 13 15 5 48 0.30 79 0 0 13 56 59 18 47 34.5 3 122 -62 13 42 55 14 11 1 13 25 54 14 27 57 0.31 80 0 0 13 17 54 18 47 35.1 4 123 -63 13 3 44 13 32 2 12 46 36 13 49 5 0.31 81 0 0 12 37 48 18 47 36.0 6 123 -63 12 23 32 12 52 3 12 6 17 13 9 13 0.31 82 0 0 11 56 42 18 47 37.2 7 123 -64 11 42 20 12 11 3 11 24 57 12 28 21 0.31 83 0 0 11 14 35 18 47 38.5 8 123 -64 11 0 7 11 29 3 10 42 35 11 46 28 0.31 84 0 0 10 31 27 18 47 40.1 9 123 -65 10 16 52 10 46 1 9 59 13 11 3 34 0.31 85 0 0 9 47 18 18 47 42.0 11 124 -65 9 32 36 10 1 58 9 14 49 10 19 40 0.31 86 0 0 9 2 7 18 47 44.1 12 124 -66 8 47 19 9 16 54 8 29 24 9 34 44 0.31 87 0 0 8 15 56 18 47 46.4 13 124 -66 8 1 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39 -52 23 25 -51 20 28 0.33 -101 0 0 -51 25 22 19 2 36.7 14 239 25 -51 39 44 -51 11 1 -51 57 7 -50 53 43 0.33 -100 0 0 -50 58 1 19 2 38.3 13 238 25 -51 12 30 -50 43 34 -51 30 0 -50 26 9 0.33 - 99 0 0 -50 29 51 19 2 39.9 13 237 25 -50 44 26 -50 15 18 -51 2 4 -49 57 45 0.33 - 98 0 0 -50 0 51 19 2 41.4 12 236 26 -50 15 31 -49 46 11 -50 33 17 -49 28 31 0.33 - 97 0 0 -49 30 59 19 2 42.8 11 236 26 -49 45 46 -49 16 13 -50 3 39 -48 58 25 0.34 - 96 0 0 -49 0 14 19 2 44.1 10 235 27 -49 15 8 -48 45 22 -49 33 8 -48 27 27 0.34 - 95 0 0 -48 28 37 19 2 45.4 9 234 27 -48 43 36 -48 13 39 -49 1 45 -47 55 36 0.34 - 94 0 0 -47 56 5 19 2 46.5 8 233 27 -48 11 11 -47 41 1 -48 29 28 -47 22 50 0.35 - 93 0 0 -47 22 39 19 2 47.6 7 233 28 -47 37 52 -47 7 28 -47 56 15 -46 49 10 0.35 - 92 0 0 -46 48 18 19 2 48.6 7 232 28 -47 3 36 -46 33 1 -47 22 8 -46 14 35 0.36 - 91 0 0 -46 13 0 19 2 49.4 6 231 28 -46 28 25 -45 57 37 -46 47 4 -45 39 4 0.37 - 90 0 0 -45 36 46 19 2 50.2 5 230 29 -45 52 17 -45 21 16 -46 11 4 -45 2 36 0.38 - 89 0 0 -44 59 34 19 2 50.8 4 230 29 -45 15 12 -44 43 59 -45 34 6 -44 25 11 0.40 - 88 0 0 -44 21 25 19 2 51.3 3 229 29 -44 37 9 -44 5 44 -44 56 11 -43 46 49 0.43 - 87 0 0 -43 42 19 19 2 51.7 2 228 30 -43 58 8 -43 26 31 -44 17 17 -43 7 29 0.49 - 86 0 0 -43 2 13 19 2 51.9 1 228 30 -43 18 9 -42 46 20 -43 37 25 -42 27 10 0.69 - 85 0 0 .. .. .... .. .. .. .. .. .. -42 37 11 .. .. .. -42 56 34 .. .. .. .... Uncertainty in time = +/- 4 secs Prediction of 2023 Mar 1.1 Data for the target star ------------------------ * name: TYC 7425-01944-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 34 51.9223 DE: -30 21 06.787 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 34 51.9223 DE: -30 21 06.787 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 10.7 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1765) Wrubel asteroid class: approx. diameter [km]: 41 approx. diameter ["]: 0.024 distance from Earth [AU]: 2.40130 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#53 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): 0.029", 0.004", 95.894° remarks: * orbital elements for (1765)Wrubel : Mean anomaly = 313.1486807311 deg Arg. of pericenter = 265.7327167870 deg Long. of node = 70.1416564740 deg Inclination = 19.9480024583 deg Eccentricity = 0.1778617456 Semimajor axis = 3.1729041282 AU Perihelion dist = 2.6085658614 AU Mag: H = 10.01, G = 0.15 Epoch of elements : MJD 60061.78833333 TDT (2023 Apr 27.7883) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#532022Nov25,3.10,2023,4,27,18.920321,-0.160867,-0.232976,6.179872,-4.270561,-0.005412,-0.000656,0.000000,0.000000 154.7777,-30.3007,-104.39,13.94,False TYC 7425-01944-1,19.58108951,-30.3518854,0.00,10.71,0.00,0.0,0,,19.60555925,-30.3006559,4.51,0.00,0,0,0 1765,Wrubel,15.20,41.3,2.4013,0,0,1.748,-15.64,,2.2,0 0,313.0112,2023,4,27,265.7327,70.1417,19.9480,0.17786,3.17290,2.60857,10.03,5.0,0.15 1.604,0.0290,0.0037,96,0.0143,Known errors,-1.00,-1,-1,-1 20230427_1944-1,60004.06 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Mar 01, 01:20 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org