IOTA/IOTA-ES occultation update for (95) Arethusa / TYC 1251-00121-1 event on 2024 Feb 13, 03:15 UT Visible from Summary ------- On 2024 Feb 13 UT, the 143.75035737844 km diameter asteroid (95) Arethusa will occult a 10.9 mag star in the constellation Taurus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.35 mag to 13.11 mag (the magnitude of the asteroid) for at most 11.760 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 Feb 13, 03:07 - 2024 Feb 13, 03:22 * geocentric midpoint of event [JD]: 2460353.63546755 * magnitude of target star: 10.89 * magnitude drop [mag]: 2.35 * estimated maximum duration [s]: 11.760 * Moon: 14 % sunlit, 56° distance * Sun: 100° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 181 * 1 sigma uncertainty interval [path widths]: +/- 0.05 * 1 sigma uncertainty interval [seconds]: +/- 3.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.028, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.028", 0.002", 95°) * approx speed of asteroid's shadow [km/s]: 12.2375 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1251-00121-1 by 95 Arethusa on 2024 Feb 13 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 156 0 0 .. .. .... .. .. .. .. .. .. .. .. .. -37 49 33 .. .. .. -37 44 24 .... 157 0 0 -38 24 12 3 8 11.9 1 70 59 -39 16 30 -37 32 31 -39 21 47 -37 27 23 .... 158 0 0 -38 7 7 3 8 12.0 1 69 59 -38 59 25 -37 15 27 -39 4 41 -37 10 19 0.43 159 0 0 -37 49 59 3 8 12.3 2 69 59 -38 42 17 -36 58 19 -38 47 33 -36 53 11 0.55 160 0 0 -37 32 49 3 8 12.8 3 68 58 -38 25 6 -36 41 9 -38 30 22 -36 36 1 0.61 161 0 0 -37 15 36 3 8 13.3 4 67 58 -38 7 53 -36 23 57 -38 13 9 -36 18 49 0.64 162 0 0 -36 58 22 3 8 14.1 5 67 57 -37 50 38 -36 6 44 -37 55 54 -36 1 36 0.66 163 0 0 -36 41 6 3 8 15.0 6 66 57 -37 33 22 -35 49 29 -37 38 37 -35 44 21 0.67 164 0 0 -36 23 50 3 8 16.0 6 66 56 -37 16 4 -35 32 13 -37 21 20 -35 27 5 0.68 165 0 0 -36 6 32 3 8 17.2 7 65 56 -36 58 46 -35 14 57 -37 4 1 -35 9 49 0.69 166 0 0 -35 49 15 3 8 18.5 8 64 55 -36 41 27 -34 57 41 -36 46 42 -34 52 33 0.70 167 0 0 -35 31 58 3 8 20.0 9 64 55 -36 24 9 -34 40 25 -36 29 24 -34 35 17 0.71 168 0 0 -35 14 41 3 8 21.6 10 63 54 -36 6 51 -34 23 9 -36 12 6 -34 18 2 0.71 169 0 0 -34 57 26 3 8 23.4 11 63 54 -35 49 34 -34 5 55 -35 54 49 -34 0 48 0.71 170 0 0 -34 40 12 3 8 25.4 12 62 53 -35 32 18 -33 48 43 -35 37 33 -33 43 36 0.72 171 0 0 -34 22 59 3 8 27.5 13 61 52 -35 15 4 -33 31 32 -35 20 19 -33 26 25 0.72 172 0 0 -34 5 50 3 8 29.8 13 61 52 -34 57 53 -33 14 24 -35 3 7 -33 9 17 0.72 173 0 0 -33 48 43 3 8 32.2 14 60 51 -34 40 44 -32 57 19 -34 45 58 -32 52 12 0.73 174 0 0 -33 31 39 3 8 34.8 15 60 50 -34 23 38 -32 40 17 -34 28 52 -32 35 11 0.73 175 0 0 -33 14 39 3 8 37.5 16 59 50 -34 6 36 -32 23 19 -34 11 50 -32 18 13 0.73 176 0 0 -32 57 43 3 8 40.4 17 58 49 -33 49 38 -32 6 25 -33 54 52 -32 1 19 0.73 177 0 0 -32 40 51 3 8 43.5 18 58 48 -33 32 44 -31 49 35 -33 37 58 -31 44 29 0.73 178 0 0 -32 24 4 3 8 46.7 19 57 48 -33 15 55 -31 32 51 -33 21 8 -31 27 45 0.73 179 0 0 -32 7 23 3 8 50.1 19 56 47 -32 59 12 -31 16 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Uncertainty in time = +/- 4 secs Prediction of 2023 Jul 13.2 Data for the target star ------------------------ * name: TYC 1251-00121-1 * constellation : Taurus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 04 12 14.4441 DE: +15 20 42.244 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 04 12 14.4440 DE: +15 20 42.244 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.9 * B mag [mag]: 11.6 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (95) Arethusa asteroid class: approx. diameter [km]: 144 approx. diameter ["]: 0.084 distance from Earth [AU]: 2.36660 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#60 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): 0.028", 0.002", 94.614° remarks: * orbital elements for (95)Arethusa : Mean anomaly = 37.1825043066 deg Arg. of pericenter = 152.9295327847 deg Long. of node = 242.9341377041 deg Inclination = 13.0098302512 deg Eccentricity = 0.1532661905 Semimajor axis = 3.0653063265 AU Perihelion dist = 2.5954985031 AU Mag: H = 8.04, G = 0.15 Epoch of elements : MJD 60353.13546633 TDT (2024 Feb 13.1355) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#602023Feb07,11.76,2024,2,13,3.251221,0.027060,-0.608505,6.900351,0.306613,0.005709,0.001144,0.000000,0.000000 -128.0343,15.4072,134.78,-13.55,False TYC 1251-00121-1,4.20401228,15.3450678,11.63,10.89,10.49,0.1,0,,4.22679498,15.4072031,2.36,2.31,0,0,0 95,Arethusa,13.11,143.922,2.3666,0,0,1.773,1.14,,10.0,0 0,37.1576,2024,2,13,152.9295,242.9341,13.0098,0.15327,3.06531,2.59550,8.04,5.0,0.15 1.050,0.0277,0.0024,95,0.0042,Known errors,1.18,0,-1,-1 20240213_0121-1,60138.17 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 13, 04:02 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org