IOTA/IOTA-ES occultation update for (196) Philomela / TYC 6856-00169-1 event on 2023 Jul 13, 05:37 UT Visible from South America Summary ------- On 2023 Jul 13 UT, the 140.1 km diameter asteroid (196) Philomela will occult a 9.6 mag star in the constellation Sagittarius 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 1.76 mag to 11.12 mag (the magnitude of the asteroid) for at most 12.400 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: 2023 Jul 13, 05:28 - 2023 Jul 13, 05:47 * geocentric midpoint of event [JD]: 2460138.73459000 * magnitude of target star: 9.60 * magnitude drop [mag]: 1.76 * estimated maximum duration [s]: 12.400 * Moon: 18 % sunlit, 145° distance * Sun: 163° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 143 * 1 sigma uncertainty interval [path widths]: +/- 0.22 * 1 sigma uncertainty interval [seconds]: +/- 4.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.034, +/- 0.020) * 1 sigma uncertainty ellipse (major, minor, PA): (0.034", 0.020", 95°) * approx speed of asteroid's shadow [km/s]: 11.2997 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6856-00169-1 by 196 Philomela on 2023 Jul 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 168 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 0 35 36 .... 169 0 0 1 6 54 5 47 3.3 1 118 15 1 51 1 0 22 56 2 10 51 0 3 14 .... 170 0 0 0 34 41 5 47 3.1 2 118 14 1 18 42 - 0 9 12 1 38 30 - 0 28 51 -0.05 171 0 0 0 2 47 5 47 2.6 3 118 13 0 46 42 - 0 41 1 1 6 27 - 1 0 37 -0.11 172 0 0 - 0 28 49 5 47 2.0 4 118 12 0 15 0 - 1 12 31 0 34 43 - 1 32 5 -0.14 173 0 0 - 1 0 6 5 47 1.1 5 118 10 - 0 16 22 - 1 43 41 0 3 18 - 2 3 13 -0.15 174 0 0 - 1 31 2 5 46 59.9 6 118 9 - 0 47 25 - 2 14 32 - 0 27 47 - 2 34 1 -0.16 175 0 0 - 2 1 37 5 46 58.6 7 118 8 - 1 18 6 - 2 45 1 - 0 58 32 - 3 4 27 -0.17 176 0 0 - 2 31 51 5 46 57.1 8 118 7 - 1 48 26 - 3 15 9 - 1 28 55 - 3 34 32 -0.17 177 0 0 - 3 1 43 5 46 55.3 10 118 6 - 2 18 25 - 3 44 54 - 1 58 56 - 4 4 15 -0.18 178 0 0 - 3 31 13 5 46 53.4 11 118 5 - 2 48 0 - 4 14 17 - 2 28 35 - 4 33 35 -0.18 179 0 0 - 4 0 19 5 46 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Uncertainty in time = +/- 5 secs Prediction of 2023 May 14.2 Data for the target star ------------------------ * name: TYC 6856-00169-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 19 41.6794 DE: -28 18 04.261 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 19 41.6794 DE: -28 18 04.261 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 9.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (196) Philomela asteroid class: approx. diameter [km]: 140 approx. diameter ["]: 0.093 distance from Earth [AU]: 2.07930 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#130 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): 0.034", 0.020", 95.192° remarks: * orbital elements for (196)Philomela : Mean anomaly = 3.7822744718 deg Arg. of pericenter = 203.5759676423 deg Long. of node = 72.2983089211 deg Inclination = 7.2627776393 deg Eccentricity = 0.0148291693 Semimajor axis = 3.1131132637 AU Perihelion dist = 3.0669483802 AU Mag: H = 6.63, G = 0.15 Epoch of elements : MJD 60138.23437500 TDT (2023 Jul 13.2344) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1302023Apr24,12.40,2023,7,13,5.630160,-0.028909,0.182054,-6.298956,-1.000094,0.001505,0.000522,0.000001,0.000000 -100.0038,-28.2916,96.99,21.86,False TYC 6856-00169-1,18.32824428,-28.3011837,0.00,9.60,0.00,0.0,4,,18.35327584,-28.2915961,1.76,0.00,0,0,0 196,Philomela,11.12,140.1,2.0793,0,0,-2.016,-4.23,,8.0,0 0,3.7402,2023,7,13,203.5760,72.2983,7.2628,0.01483,3.11311,3.06695,6.65,5.0,0.15 1.224,0.0343,0.0197,95,0.0208,Known errors,-1.00,-1,-1,-1 20230713_0169-1,60078.17 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 May 14, 04:02 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org