IOTA/IOTA-ES occultation update for (40) Harmonia / TYC 6894-01297-1 event on 2024 Sep 21, 04:26 UT Visible from Summary ------- On 2024 Sep 21 UT, the 113.647 km diameter asteroid (40) Harmonia will occult a 10.0 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.44 mag to 11.12 mag (the magnitude of the asteroid) for at most 17.890 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: 2024 Sep 21, 04:09 - 2024 Sep 21, 04:42 * geocentric midpoint of event [JD]: 2460574.68492192 * magnitude of target star: 10.02 * magnitude drop [mag]: 1.44 * estimated maximum duration [s]: 17.890 * Moon: 87 % sunlit, 109° distance * Sun: 115° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 119 * 1 sigma uncertainty interval [path widths]: +/- 0.03 * 1 sigma uncertainty interval [seconds]: +/- 3.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.018, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.018", 0.002", 84°) * approx speed of asteroid's shadow [km/s]: 6.3539 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6894-01297-1 by 40 Harmonia on 2024 Sep 21 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 146 0 0 4 55 34 4 10 20.8 1 116 59 4 20 6 5 31 9 4 18 6 5 33 10 .... 147 0 0 4 27 8 4 10 21.3 2 116 58 3 51 44 5 2 39 3 49 44 5 4 40 -0.13 148 0 0 3 59 0 4 10 22.2 3 116 58 3 23 40 4 34 27 3 21 40 4 36 27 -0.19 149 0 0 3 31 10 4 10 23.5 4 116 57 2 55 54 4 6 32 2 53 54 4 8 33 -0.21 150 0 0 3 3 39 4 10 25.1 5 116 56 2 28 27 3 38 57 2 26 28 3 40 57 -0.23 151 0 0 2 36 27 4 10 27.2 6 116 55 2 1 20 3 11 42 1 59 21 3 13 41 -0.24 152 0 0 2 9 37 4 10 29.6 7 116 54 1 34 34 2 44 46 1 32 35 2 46 46 -0.25 153 0 0 1 43 7 4 10 32.4 9 116 53 1 8 8 2 18 12 1 6 10 2 20 11 -0.26 154 0 0 1 16 59 4 10 35.6 10 116 52 0 42 5 1 51 59 0 40 6 1 53 58 -0.26 155 0 0 0 51 13 4 10 39.2 11 116 51 0 16 23 1 26 9 0 14 25 1 28 8 -0.26 156 0 0 0 25 50 4 10 43.2 12 116 50 - 0 8 55 1 0 41 - 0 10 53 1 2 40 -0.27 157 0 0 0 0 51 4 10 47.5 13 116 49 - 0 33 50 0 35 38 - 0 35 47 0 37 36 -0.27 158 0 0 - 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59 0 0 .. .. .... .. .. .. .. .. .. 26 14 12 .. .. .. 26 12 8 .. .. .. .... Uncertainty in time = +/- 3 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: TYC 6894-01297-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 41 58.4010 DE: -25 30 26.285 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 41 58.4008 DE: -25 30 26.285 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 10.0 * B mag [mag]: 10.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (40) Harmonia asteroid class: approx. diameter [km]: 114 approx. diameter ["]: 0.099 distance from Earth [AU]: 1.57610 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#135 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): 0.018", 0.002", 84.183° remarks: * orbital elements for (40)Harmonia : Mean anomaly = 317.8524137181 deg Arg. of pericenter = 269.3421703893 deg Long. of node = 94.1562616109 deg Inclination = 4.2558798239 deg Eccentricity = 0.0460917513 Semimajor axis = 2.2671381556 AU Perihelion dist = 2.1626417877 AU Mag: H = 7.29, G = 0.15 Epoch of elements : MJD 60574.18492141 TDT (2024 Sep 21.1849) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1352023Apr24,17.89,2024,9,21,4.438126,-0.063080,0.299097,3.508106,0.744825,0.004776,0.001005,0.000001,0.000000 -131.2455,-25.4501,111.68,0.52,False TYC 6894-01297-1,19.69955586,-25.5073012,10.20,10.02,9.92,0.0,0,,19.72477270,-25.4501448,1.44,1.19,0,0,0 40,Harmonia,11.12,113.647,1.5761,0,0,1.446,4.16,,5.8,0 0,317.7990,2024,9,21,269.3422,94.1563,4.2559,0.04609,2.26714,2.16264,7.29,5.0,0.15 1.028,0.0177,0.0021,84,0.0028,Known errors,1.06,0,-1,-1 20240921_1297-1,60140.58 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 13:48 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org