IOTA/IOTA-ES occultation update for (172) Baucis / TYC 255-01153-1 event on 2024 Mar 18, 21:20 UT Visible from Summary ------- On 2024 Mar 18 UT, the 66.23 km diameter asteroid (172) Baucis will occult a 11.5 mag star in the constellation Leo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.31 mag to 12.41 mag (the magnitude of the asteroid) for at most 5.300 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 Mar 18, 21:12 - 2024 Mar 18, 21:28 * geocentric midpoint of event [JD]: 2460388.38917495 * magnitude of target star: 11.49 * magnitude drop [mag]: 1.31 * estimated maximum duration [s]: 5.300 * Moon: 67 % sunlit, 58° distance * Sun: 166° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 70 * 1 sigma uncertainty interval [path widths]: +/- 0.19 * 1 sigma uncertainty interval [seconds]: +/- 2.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.018, +/- 0.014) * 1 sigma uncertainty ellipse (major, minor, PA): (0.023", 0.004", 127°) * approx speed of asteroid's shadow [km/s]: 12.5037 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 255-01153-1 by 172 Baucis on 2024 Mar 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 - 64 0 0 - 7 35 23 21 28 27.4 0 89 14 - 7 16 25 - 7 54 25 - 7 9 14 - 8 1 37 .... - 63 0 0 - 7 34 24 21 28 27.3 1 89 13 - 7 15 25 - 7 53 25 - 7 8 14 - 8 0 37 0.20 - 62 0 0 - 7 33 37 21 28 27.0 2 89 12 - 7 14 38 - 7 52 38 - 7 7 28 - 7 59 50 0.26 - 61 0 0 - 7 33 3 21 28 26.6 3 88 11 - 7 14 5 - 7 52 4 - 7 6 54 - 7 59 16 0.29 - 60 0 0 - 7 32 43 21 28 26.0 4 88 10 - 7 13 44 - 7 51 43 - 7 6 34 - 7 58 56 0.30 - 59 0 0 - 7 32 35 21 28 25.2 5 88 9 - 7 13 37 - 7 51 36 - 7 6 26 - 7 58 48 0.31 - 58 0 0 - 7 32 40 21 28 24.3 6 88 8 - 7 13 42 - 7 51 41 - 7 6 32 - 7 58 53 0.31 - 57 0 0 - 7 32 59 21 28 23.2 7 88 7 - 7 14 0 - 7 51 59 - 7 6 50 - 7 59 12 0.32 - 56 0 0 - 7 33 30 21 28 22.0 8 88 6 - 7 14 32 - 7 52 31 - 7 7 21 - 7 59 43 0.32 - 55 0 0 - 7 34 14 21 28 20.6 9 88 5 - 7 15 16 - 7 53 15 - 7 8 6 - 8 0 27 0.32 - 54 0 0 - 7 35 11 21 28 19.0 10 88 4 - 7 16 13 - 7 54 12 - 7 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0 -29 48 42 21 12 34.5 12 278 -24 -29 29 41 -30 7 44 -29 22 30 -30 14 57 0.35 106 0 0 -29 52 20 21 12 32.9 11 278 -24 -29 33 20 -30 11 23 -29 26 9 -30 18 35 0.36 107 0 0 -29 55 48 21 12 31.4 10 277 -23 -29 36 48 -30 14 50 -29 29 37 -30 22 3 0.36 108 0 0 -29 59 5 21 12 30.0 10 277 -22 -29 40 5 -30 18 7 -29 32 55 -30 25 19 0.36 109 0 0 -30 2 11 21 12 28.7 9 276 -21 -29 43 12 -30 21 12 -29 36 1 -30 28 25 0.36 110 0 0 -30 5 6 21 12 27.5 8 276 -20 -29 46 7 -30 24 7 -29 38 56 -30 31 20 0.36 111 0 0 -30 7 50 21 12 26.5 7 275 -19 -29 48 51 -30 26 51 -29 41 41 -30 34 3 0.36 112 0 0 -30 10 23 21 12 25.6 6 275 -19 -29 51 25 -30 29 24 -29 44 14 -30 36 36 0.37 113 0 0 -30 12 45 21 12 24.8 5 274 -18 -29 53 47 -30 31 46 -29 46 37 -30 38 58 0.37 114 0 0 -30 14 56 21 12 24.1 4 274 -17 -29 55 58 -30 33 57 -29 48 48 -30 41 9 0.37 115 0 0 -30 16 56 21 12 23.5 3 273 -16 -29 57 58 -30 35 56 -29 50 48 -30 43 8 0.38 116 0 0 -30 18 45 21 12 23.1 3 273 -15 -29 59 47 -30 37 45 -29 52 37 -30 44 57 0.40 117 0 0 -30 20 22 21 12 22.8 2 272 -14 -30 1 25 -30 39 22 -29 54 15 -30 46 34 0.42 118 0 0 -30 21 49 21 12 22.6 1 272 -13 -30 2 51 -30 40 48 -29 55 41 -30 48 0 0.50 119 0 0 -30 23 4 21 12 22.6 0 271 -13 -30 4 6 -30 42 3 -29 56 57 -30 49 15 8.97 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 14.2 Data for the target star ------------------------ * name: TYC 255-01153-1 * constellation : Leo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 10 57 24.8543 DE: +01 13 37.125 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 10 57 24.8542 DE: +01 13 37.125 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.400,0.400) * V mag [mag]: 11.5 * B mag [mag]: 11.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (172) Baucis asteroid class: Barbarian approx. diameter [km]: 66 approx. diameter ["]: 0.055 distance from Earth [AU]: 1.65660 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#94 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): 0.023", 0.004", 126.9° remarks: * orbital elements for (172)Baucis : Mean anomaly = 203.9027415142 deg Arg. of pericenter = 359.2709773340 deg Long. of node = 331.9043656766 deg Inclination = 10.0163752411 deg Eccentricity = 0.1144929002 Semimajor axis = 2.3795380786 AU Perihelion dist = 2.1070978628 AU Mag: H = 8.77, G = 0.15 Epoch of elements : MJD 60387.88917474 TDT (2024 Mar 18.8892) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#942023Apr24,5.30,2024,3,18,21.340199,-0.063493,-0.317222,-6.919898,1.386630,0.001434,-0.000072,0.000001,-0.000001 27.6428,1.0960,-138.15,-0.49,False TYC 255-01153-1,10.95690396,1.2269792,11.77,11.49,11.34,0.0,0,,10.97790255,1.0959867,1.30,1.10,0,0,0 172,Baucis,12.41,66.230,1.6566,0,0,-2.449,7.36,,3.8,0 0,203.6640,2024,3,18,359.2710,331.9044,10.0164,0.11449,2.37954,2.10710,8.77,5.0,0.15 1.189,0.0227,0.0040,127,0.0104,Known errors,1.96,0,-1,-1 20240318_1153-1,60139.24 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 05:47 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org