IOTA/IOTA-ES occultation update for (346) Hermentaria / TYC 6913-01481-1 event on 2022 Oct 22, 01:34 UT Visible from South America Summary ------- On 2022 Oct 22 UT, the 96.3 km diameter asteroid (346) Hermentaria will occult a 11.9 mag star in the constellation Capricornus for observers along a path across South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.10 mag to 12.55 mag (the magnitude of the asteroid) for at most 5.840 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: 2022 Oct 22, 01:28 - 2022 Oct 22, 01:40 * geocentric midpoint of event [JD]: 2459874.56576088 * magnitude of target star: 11.94 * magnitude drop [mag]: 1.10 * estimated maximum duration [s]: 5.840 * Moon: 12 % sunlit, 132° distance * Sun: 91° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 104 * 1 sigma uncertainty interval [path widths]: +/- 0.11 * 1 sigma uncertainty interval [seconds]: +/- 2.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.025, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.025", 0.002", 87°) * approx speed of asteroid's shadow [km/s]: 16.4783 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6913-01481-1 by 346 Hermentaria on 2022 Oct 22 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 142 0 0 -34 14 30 1 28 42.3 1 123 64 -34 48 22 -33 40 47 -34 55 40 -33 33 34 .... 143 0 0 -34 47 5 1 28 42.5 2 122 64 -35 20 53 -34 13 26 -35 28 10 -34 6 13 0.41 144 0 0 -35 19 15 1 28 42.8 3 122 64 -35 52 59 -34 45 40 -36 0 15 -34 38 28 0.41 145 0 0 -35 50 59 1 28 43.2 4 121 64 -36 24 39 -35 17 29 -36 31 55 -35 10 18 0.41 146 0 0 -36 22 18 1 28 43.8 5 121 64 -36 55 54 -35 48 52 -37 3 8 -35 41 42 0.41 147 0 0 -36 53 11 1 28 44.4 6 120 63 -37 26 41 -36 19 49 -37 33 54 -36 12 40 0.41 148 0 0 -37 23 36 1 28 45.2 7 119 63 -37 57 2 -36 50 19 -38 4 14 -36 43 12 0.41 149 0 0 -37 53 34 1 28 46.1 8 119 63 -38 26 54 -37 20 22 -38 34 5 -37 13 16 0.41 150 0 0 -38 23 4 1 28 47.0 9 118 62 -38 56 19 -37 49 58 -39 3 29 -37 42 52 0.41 151 0 0 -38 52 5 1 28 48.1 10 117 62 -39 25 15 -38 19 5 -39 32 24 -38 12 0 0.41 152 0 0 -39 20 39 1 28 49.3 10 117 62 -39 53 42 -38 47 44 -40 0 50 -38 40 40 0.41 153 0 0 -39 48 43 1 28 50.5 11 116 61 -40 21 41 -39 15 54 -40 28 47 -39 8 52 0.41 154 0 0 -40 16 18 1 28 51.9 12 116 61 -40 49 10 -39 43 34 -40 56 15 -39 36 34 0.41 155 0 0 -40 43 23 1 28 53.3 13 115 60 -41 16 9 -40 10 46 -41 23 13 -40 3 47 0.41 156 0 0 -41 9 59 1 28 54.8 14 114 60 -41 42 39 -40 37 28 -41 49 41 -40 30 30 0.41 157 0 0 -41 36 5 1 28 56.4 15 113 59 -42 8 39 -41 3 41 -42 15 40 -40 56 44 0.41 158 0 0 -42 1 42 1 28 58.1 16 113 59 -42 34 9 -41 29 23 -42 41 8 -41 22 28 0.41 159 0 0 -42 26 48 1 28 59.8 17 112 58 -42 59 8 -41 54 36 -43 6 6 -41 47 42 0.41 160 0 0 -42 51 24 1 29 1.6 17 111 58 -43 23 38 -42 19 19 -43 30 35 -42 12 26 0.41 161 0 0 -43 15 30 1 29 3.5 18 111 57 -43 47 38 -42 43 31 -43 54 33 -42 36 40 0.41 162 0 0 -43 39 7 1 29 5.5 19 110 57 -44 11 7 -43 7 14 -44 18 1 -43 0 24 0.41 163 0 0 -44 2 13 1 29 7.5 20 109 56 -44 34 6 -43 30 27 -44 40 58 -43 23 38 0.41 164 0 0 -44 24 48 1 29 9.5 21 108 55 -44 56 35 -43 53 9 -45 3 26 -43 46 22 0.41 165 0 0 -44 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7 52 1 40 38.6 5 243 -71 - 7 40 19 - 6 35 33 - 7 47 19 - 6 28 37 0.50 - 23 0 0 - 6 34 43 1 40 39.3 4 243 -71 - 7 7 4 - 6 2 31 - 7 14 2 - 5 55 37 0.52 - 22 0 0 - 6 2 2 1 40 39.8 3 243 -72 - 6 34 16 - 5 29 56 - 6 41 12 - 5 23 3 0.56 - 21 0 0 - 5 29 48 1 40 40.1 2 243 -72 - 6 1 55 - 4 57 49 - 6 8 50 - 4 50 58 0.65 - 20 0 0 - 4 58 3 1 40 40.3 1 243 -72 - 5 30 3 - 4 26 11 - 5 36 57 - 4 19 21 1.09 Uncertainty in time = +/- 3 secs Prediction of 2022 Aug 30.1 Data for the target star ------------------------ * name: TYC 6913-01481-1 * constellation : Capricornus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 13 37.9920 DE: -27 24 02.143 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 13 37.9920 DE: -27 24 02.143 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.9 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (346) Hermentaria asteroid class: approx. diameter [km]: 96 approx. diameter ["]: 0.055 distance from Earth [AU]: 2.42010 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#49 date of fit: 2022 Jun 09 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): 0.025", 0.002", 86.543° remarks: * orbital elements for (346)Hermentaria : Mean anomaly = 308.5098962286 deg Arg. of pericenter = 291.7469471368 deg Long. of node = 91.9271092794 deg Inclination = 8.7517033311 deg Eccentricity = 0.1029590789 Semimajor axis = 2.7954612956 AU Perihelion dist = 2.5076431756 AU Mag: H = 7.46, G = 0.15 Epoch of elements : MJD 59874.06569444 TDT (2022 Oct 22.0657) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#492022Jun09,5.84,2022,10,22,1.578261,0.107952,-0.356148,8.913197,2.656987,0.005627,0.001302,0.000000,0.000000 -110.3937,-27.3335,152.46,-10.99,False TYC 6913-01481-1,20.22722003,-27.4005952,0.00,11.94,0.00,0.0,0,,20.25013970,-27.3334909,1.10,0.00,0,0,0 346,Hermentaria,12.55,96.3,2.4201,0,0,2.431,9.66,,4.8,0 0,308.2852,2022,10,21,291.7469,91.9271,8.7517,0.10296,2.79546,2.50764,7.46,5.0,0.15 1.107,0.0250,0.0016,87,0.0059,Known errors,-1.00,-1,-1,-1 20221022_1481-1,59821.08 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Aug 30, 01:55 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org