IOTA/IOTA-ES occultation update for (308) Polyxo / TYC 6304-00806-1 event on 2024 Nov 20, 21:51 UT Visible from Summary ------- On 2024 Nov 20 UT, the 136.396400103418 km diameter asteroid (308) Polyxo will occult a 11.4 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 2.42 mag to 13.67 mag (the magnitude of the asteroid) for at most 3.610 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 Nov 20, 21:48 - 2024 Nov 20, 21:53 * geocentric midpoint of event [JD]: 2460635.41043071 * magnitude of target star: 11.37 * magnitude drop [mag]: 2.42 * estimated maximum duration [s]: 3.610 * Moon: 70 % sunlit, 161° distance * Sun: 49° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 137 * 1 sigma uncertainty interval [path widths]: +/- 0.03 * 1 sigma uncertainty interval [seconds]: +/- 0.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.007, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.007", 0.002", 86°) * approx speed of asteroid's shadow [km/s]: 37.8633 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6304-00806-1 by 308 Polyxo on 2024 Nov 20 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 168 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. -11 32 44 .. .. .. .... 169 0 0 -11 12 5 21 48 14.0 1 109 50 -11 51 41 -10 32 32 -11 53 43 -10 30 30 .... 170 0 0 -11 32 58 21 48 14.1 2 109 51 -12 12 33 -10 53 26 -12 14 35 -10 51 24 0.15 171 0 0 -11 53 44 21 48 14.2 3 109 52 -12 33 18 -11 14 13 -12 35 20 -11 12 12 0.14 172 0 0 -12 14 23 21 48 14.4 4 109 53 -12 53 55 -11 34 54 -12 55 57 -11 32 52 0.13 173 0 0 -12 34 54 21 48 14.6 5 109 54 -13 14 25 -11 55 26 -13 16 26 -11 53 24 0.13 174 0 0 -12 55 16 21 48 14.9 6 108 55 -13 34 46 -12 15 50 -13 36 47 -12 13 49 0.13 175 0 0 -13 15 30 21 48 15.3 7 108 56 -13 54 58 -12 36 5 -13 57 0 -12 34 4 0.12 176 0 0 -13 35 35 21 48 15.7 8 108 57 -14 15 1 -12 56 12 -14 17 3 -12 54 10 0.12 177 0 0 -13 55 30 21 48 16.1 9 108 58 -14 34 55 -13 16 9 -14 36 56 -13 14 7 0.12 178 0 0 -14 15 15 21 48 16.6 10 107 59 -14 54 38 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Uncertainty in time = +/- 0 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: TYC 6304-00806-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 16 30.5230 DE: -19 12 04.639 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 16 30.5230 DE: -19 12 04.639 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.4 * B mag [mag]: 12.1 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (308) Polyxo asteroid class: approx. diameter [km]: 136 approx. diameter ["]: 0.059 distance from Earth [AU]: 3.17950 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): 0.007", 0.002", 85.711° remarks: * orbital elements for (308)Polyxo : Mean anomaly = 9.8546690177 deg Arg. of pericenter = 112.2364799382 deg Long. of node = 181.5826783277 deg Inclination = 4.3626016910 deg Eccentricity = 0.0386211189 Semimajor axis = 2.7495414349 AU Perihelion dist = 2.6433510683 AU Mag: H = 8.16, G = 0.21 Epoch of elements : MJD 60634.91043063 TDT (2024 Nov 20.9104) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1112023Apr24,3.61,2024,11,20,21.850337,0.009123,-0.111488,21.287306,1.890864,0.004381,0.000787,-0.000001,0.000000 -98.6671,-19.1581,-151.30,-19.95,False TYC 6304-00806-1,19.27514534,-19.2012884,12.09,11.37,10.98,0.1,0,,19.29914776,-19.1581215,2.42,2.37,0,0,0 308,Polyxo,13.67,136.627,3.1795,0,0,4.156,5.23,,7.6,0 0,9.6579,2024,11,20,112.2365,181.5827,4.3626,0.03862,2.74954,2.64335,8.16,5.0,0.15 1.026,0.0073,0.0015,86,0.0015,Known errors,0.95,0,-1,-1 20241120_0806-1,60140.71 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:58 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org