IOTA/IOTA-ES occultation update for (308) Polyxo / TYC 6248-01133-1 event on 2024 Jun 30, 16:51 UT Visible from Summary ------- On 2024 Jun 30 UT, the 136.485960406091 km diameter asteroid (308) Polyxo will occult a 10.3 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 1.75 mag to 11.82 mag (the magnitude of the asteroid) for at most 13.580 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 Jun 30, 16:42 - 2024 Jun 30, 17:00 * geocentric midpoint of event [JD]: 2460492.20250325 * magnitude of target star: 10.31 * magnitude drop [mag]: 1.75 * estimated maximum duration [s]: 13.580 * Moon: 31 % sunlit, 125° distance * Sun: 165° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 168 * 1 sigma uncertainty interval [path widths]: +/- 0.02 * 1 sigma uncertainty interval [seconds]: +/- 1.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.014", 0.003", 92°) * approx speed of asteroid's shadow [km/s]: 10.0562 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6248-01133-1 by 308 Polyxo on 2024 Jun 30 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 - 10 0 0 -35 48 16 17 0 11.7 0 110 6 .. .. .. -36 36 42 .. .. .. -36 39 5 .... - 9 0 0 -36 6 23 17 0 11.6 1 110 5 -35 18 28 -36 54 49 -35 16 8 -36 57 12 0.54 - 8 0 0 -36 24 27 17 0 11.3 2 109 4 -35 36 32 -37 12 53 -35 34 11 -37 15 16 0.62 - 7 0 0 -36 42 27 17 0 10.8 3 108 3 -35 54 32 -37 30 53 -35 52 11 -37 33 16 0.64 - 6 0 0 -37 0 23 17 0 10.2 4 108 2 -36 12 28 -37 48 49 -36 10 7 -37 51 13 0.66 - 5 0 0 -37 18 15 17 0 9.4 4 107 1 -36 30 19 -38 6 41 -36 27 59 -38 9 4 0.67 - 4 0 0 -37 36 2 17 0 8.4 5 107 1 -36 48 7 -38 24 28 -36 45 46 -38 26 51 0.67 - 3 0 0 -37 53 44 17 0 7.2 6 106 0 -37 5 49 -38 42 9 -37 3 28 -38 44 33 0.68 - 2 0 0 -38 11 20 17 0 5.9 7 105 -1 -37 23 26 -38 59 45 -37 21 5 -39 2 9 0.68 - 1 0 0 -38 28 51 17 0 4.5 8 105 -2 -37 40 57 -39 17 16 -37 38 37 -39 19 39 0.68 0 0 0 -38 46 16 17 0 2.9 9 104 -3 -37 58 22 -39 34 40 -37 56 2 -39 37 3 0.68 1 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0.74 -176 0 0 -36 19 1 16 43 16.3 11 258 -26 -35 31 8 -37 7 25 -35 28 47 -37 9 48 0.74 -175 0 0 -36 1 5 16 43 14.1 11 257 -25 -35 13 12 -36 49 28 -35 10 52 -36 51 52 0.74 -174 0 0 -35 43 7 16 43 12.0 10 257 -24 -34 55 14 -36 31 29 -34 52 54 -36 33 53 0.75 -173 0 0 -35 25 5 16 43 10.1 9 256 -23 -34 37 14 -36 13 28 -34 34 53 -36 15 51 0.75 -172 0 0 -35 7 2 16 43 8.4 8 256 -23 -34 19 11 -35 55 23 -34 16 51 -35 57 47 0.76 -171 0 0 -34 48 57 16 43 6.8 7 255 -22 -34 1 6 -35 37 17 -33 58 46 -35 39 41 0.76 -170 0 0 -34 30 50 16 43 5.4 6 254 -21 -33 43 1 -35 19 10 -33 40 40 -35 21 33 0.77 -169 0 0 -34 12 43 16 43 4.2 5 254 -20 -33 24 54 -35 1 1 -33 22 34 -35 3 25 0.78 -168 0 0 -33 54 34 16 43 3.2 4 253 -19 -33 6 47 -34 42 52 -33 4 27 -34 45 15 0.80 -167 0 0 -33 36 26 16 43 2.3 4 253 -18 -32 48 40 -34 24 43 -32 46 20 -34 27 6 0.83 -166 0 0 -33 18 18 16 43 1.7 3 252 -17 -32 30 33 -34 6 33 -32 28 13 -34 8 56 0.87 -165 0 0 -33 0 11 16 43 1.2 2 252 -16 -32 12 27 -33 48 25 -32 10 7 -33 50 48 0.95 -164 0 0 -32 42 5 16 43 0.9 1 251 -16 -31 54 22 -33 30 17 -31 52 2 -33 32 40 1.20 -163 0 0 -32 24 0 16 43 0.8 0 251 -15 .. .. .. -33 12 11 .. .. .. -33 14 34 25.97 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 14.4 Data for the target star ------------------------ * name: TYC 6248-01133-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 43 52.0030 DE: -16 23 15.086 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 43 52.0030 DE: -16 23 15.085 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.3 * B mag [mag]: 11.0 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (308) Polyxo asteroid class: approx. diameter [km]: 136 approx. diameter ["]: 0.114 distance from Earth [AU]: 1.65510 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#111 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): 0.014", 0.003", 92.4° remarks: * orbital elements for (308)Polyxo : Mean anomaly = 338.8659584937 deg Arg. of pericenter = 112.2696834173 deg Long. of node = 181.5866204034 deg Inclination = 4.3625220668 deg Eccentricity = 0.0387438241 Semimajor axis = 2.7498815185 AU Perihelion dist = 2.6433405928 AU Mag: H = 8.16, G = 0.21 Epoch of elements : MJD 60491.70250375 TDT (2024 Jun 30.7025) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1112023Apr24,13.58,2024,6,30,16.860078,0.018111,-0.580545,-5.673236,-0.176732,0.001185,-0.000687,0.000001,0.000000 94.1777,-16.3990,-71.94,23.11,False TYC 6248-01133-1,17.73111196,-16.3875238,11.02,10.31,9.93,0.1,0,,17.75502189,-16.3990074,1.75,1.70,0,0,0 308,Polyxo,11.82,136.606,1.6551,0,0,-2.094,-0.94,,7.6,0 0,338.7141,2024,6,30,112.2697,181.5866,4.3625,0.03874,2.74988,2.64334,8.16,5.0,0.15 1.025,0.0140,0.0026,92,0.0028,Known errors,0.79,0,-1,-1 20240630_1133-1,60139.41 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 09:49 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org