IOTA/IOTA-ES occultation update for (25) Phocaea / TYC 5629-00646-1 event on 2024 Oct 19, 17:50 UT Visible from Summary ------- On 2024 Oct 19 UT, the 72.359 km diameter asteroid (25) Phocaea will occult a 11.6 mag star in the constellation Ophiuchus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.06 mag to 12.18 mag (the magnitude of the asteroid) for at most 1.720 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 Oct 19, 17:47 - 2024 Oct 19, 17:52 * geocentric midpoint of event [JD]: 2460603.24309034 * magnitude of target star: 11.64 * magnitude drop [mag]: 1.06 * estimated maximum duration [s]: 1.720 * Moon: 92 % sunlit, 158° distance * Sun: 47° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 73 * 1 sigma uncertainty interval [path widths]: +/- 0.22 * 1 sigma uncertainty interval [seconds]: +/- 0.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.017, +/- 0.008) * 1 sigma uncertainty ellipse (major, minor, PA): (0.018", 0.008", 80°) * approx speed of asteroid's shadow [km/s]: 42.0632 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5629-00646-1 by 25 Phocaea on 2024 Oct 19 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 -133 0 0 - 1 23 32 17 47 32.5 1 98 47 - 1 43 29 - 1 3 35 - 1 52 6 - 0 54 59 .... -132 0 0 - 1 31 45 17 47 32.6 2 98 48 - 1 51 43 - 1 11 48 - 2 0 20 - 1 3 12 0.12 -131 0 0 - 1 40 5 17 47 32.7 3 98 49 - 2 0 4 - 1 20 8 - 2 8 40 - 1 11 32 0.12 -130 0 0 - 1 48 31 17 47 32.8 4 98 50 - 2 8 30 - 1 28 33 - 2 17 7 - 1 19 57 0.12 -129 0 0 - 1 57 3 17 47 33.0 5 97 51 - 2 17 2 - 1 37 5 - 2 25 39 - 1 28 29 0.12 -128 0 0 - 2 5 40 17 47 33.3 6 97 52 - 2 25 39 - 1 45 42 - 2 34 17 - 1 37 6 0.12 -127 0 0 - 2 14 23 17 47 33.6 7 97 53 - 2 34 23 - 1 54 25 - 2 43 0 - 1 45 48 0.12 -126 0 0 - 2 23 11 17 47 33.9 8 97 54 - 2 43 11 - 2 3 13 - 2 51 48 - 1 54 36 0.12 -125 0 0 - 2 32 5 17 47 34.3 9 97 55 - 2 52 5 - 2 12 6 - 3 0 42 - 2 3 29 0.12 -124 0 0 - 2 41 3 17 47 34.7 10 97 56 - 3 1 3 - 2 21 4 - 3 9 41 - 2 12 27 0.12 -123 0 0 - 2 50 7 17 47 35.2 11 97 57 - 3 10 7 - 2 30 7 - 3 18 45 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12 -15 28 37 -16 16 44 -15 20 5 0.12 12 0 0 -15 45 4 17 52 7.4 34 271 -10 -16 4 52 -15 25 17 -16 13 25 -15 16 45 0.12 13 0 0 -15 41 35 17 52 8.9 33 271 -11 -16 1 23 -15 21 47 -16 9 56 -15 13 16 0.12 14 0 0 -15 37 56 17 52 10.3 32 271 -12 -15 57 45 -15 18 8 -16 6 17 -15 9 37 0.12 15 0 0 -15 34 8 17 52 11.6 31 270 -13 -15 53 57 -15 14 20 -16 2 30 -15 5 48 0.12 16 0 0 -15 30 11 17 52 12.9 30 270 -14 -15 50 0 -15 10 22 -15 58 32 -15 1 50 0.12 17 0 0 -15 26 4 17 52 14.2 29 270 -15 -15 45 53 -15 6 15 -15 54 26 -14 57 43 0.12 18 0 0 -15 21 48 17 52 15.5 28 269 -16 -15 41 37 -15 1 59 -15 50 10 -14 53 27 0.12 19 0 0 -15 17 22 17 52 16.7 27 269 -17 -15 37 12 -14 57 33 -15 45 45 -14 49 1 0.12 20 0 0 -15 12 48 17 52 17.8 26 269 -18 -15 32 38 -14 52 59 -15 41 11 -14 44 26 0.12 21 0 0 -15 8 4 17 52 19.0 25 269 -19 -15 27 55 -14 48 15 -15 36 28 -14 39 42 0.12 22 0 0 -15 3 12 17 52 20.0 24 268 -20 -15 23 2 -14 43 22 -15 31 36 -14 34 50 0.12 23 0 0 -14 58 11 17 52 21.1 23 268 -21 -15 18 1 -14 38 21 -15 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0.13 36 0 0 -13 40 6 17 52 31.0 11 265 -33 -14 0 0 -13 20 12 -14 8 35 -13 11 38 0.13 37 0 0 -13 33 10 17 52 31.4 10 264 -34 -13 53 5 -13 13 16 -14 1 40 -13 4 41 0.13 38 0 0 -13 26 7 17 52 31.8 9 264 -35 -13 46 2 -13 6 12 -13 54 37 -12 57 38 0.13 39 0 0 -13 18 56 17 52 32.2 8 264 -36 -13 38 51 -12 59 1 -13 47 27 -12 50 27 0.13 40 0 0 -13 11 38 17 52 32.5 7 264 -37 -13 31 34 -12 51 43 -13 40 10 -12 43 9 0.14 41 0 0 -13 4 14 17 52 32.8 6 263 -38 -13 24 10 -12 44 19 -13 32 46 -12 35 44 0.14 42 0 0 -12 56 42 17 52 33.1 5 263 -39 -13 16 39 -12 36 47 -13 25 14 -12 28 12 0.14 43 0 0 -12 49 4 17 52 33.2 4 263 -40 -13 9 1 -12 29 8 -13 17 37 -12 20 33 0.15 44 0 0 -12 41 19 17 52 33.4 3 263 -41 -13 1 16 -12 21 23 -13 9 52 -12 12 48 0.16 45 0 0 -12 33 28 17 52 33.5 2 263 -42 -12 53 25 -12 13 31 -13 2 1 -12 4 56 0.18 46 0 0 -12 25 30 17 52 33.6 1 262 -42 -12 45 28 -12 5 33 -12 54 4 -11 56 58 0.26 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: TYC 5629-00646-1 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 46 32.5150 DE: -07 35 19.280 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 46 32.5148 DE: -07 35 19.281 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.6 * B mag [mag]: 12.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (25) Phocaea asteroid class: approx. diameter [km]: 72 approx. diameter ["]: 0.042 distance from Earth [AU]: 2.36880 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#118 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", 0.008", 79.669° remarks: * orbital elements for (25)Phocaea : Mean anomaly = 343.9184047516 deg Arg. of pericenter = 90.2020932774 deg Long. of node = 214.0923348141 deg Inclination = 21.6081633620 deg Eccentricity = 0.2542411649 Semimajor axis = 2.4004444084 AU Perihelion dist = 1.7901526257 AU Mag: H = 7.90, G = 0.15 Epoch of elements : MJD 60602.74309021 TDT (2024 Oct 19.7431) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1182023Apr24,1.72,2024,10,19,17.834168,-0.011652,-0.118153,23.631161,-2.287784,0.003663,0.000443,-0.000001,0.000000 -44.2400,-7.6327,-91.30,-10.35,False TYC 5629-00646-1,16.77569867,-7.5886888,12.15,11.64,11.36,0.0,0,,16.79772327,-7.6326536,1.05,0.95,0,0,0 25,Phocaea,12.18,72.359,2.3688,0,0,5.902,-8.49,,4.2,0 0,343.7215,2024,10,19,90.2021,214.0923,21.6082,0.25424,2.40044,1.79015,7.89,5.0,0.15 1.216,0.0177,0.0080,80,0.0091,Known errors,0.84,0,-1,-1 20241019_0646-1,60140.65 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:30 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org