IOTA/IOTA-ES occultation update for (42) Isis / TYC 7393-01504-1 event on 2024 Sep 09, 01:17 UT Visible from Summary ------- On 2024 Sep 09 UT, the 113.026 km diameter asteroid (42) Isis will occult a 11.0 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 0.74 mag to 10.95 mag (the magnitude of the asteroid) for at most 10.620 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 Sep 09, 01:07 - 2024 Sep 09, 01:26 * geocentric midpoint of event [JD]: 2460562.55372179 * magnitude of target star: 10.97 * magnitude drop [mag]: 0.74 * estimated maximum duration [s]: 10.620 * Moon: 28 % sunlit, 44° distance * Sun: 109° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 121 * 1 sigma uncertainty interval [path widths]: +/- 0.05 * 1 sigma uncertainty interval [seconds]: +/- 2.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.030, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.030", 0.002", 101°) * approx speed of asteroid's shadow [km/s]: 10.6396 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7393-01504-1 by 42 Isis on 2024 Sep 9 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 169 0 0 .. .. .... .. .. .. .. .. .. -18 54 39 .. .. .. -18 58 55 .. .. .. .... 170 0 0 -18 52 33 1 8 2.0 1 123 65 -19 32 19 -18 13 1 -19 36 35 -18 8 47 .... 171 0 0 -19 30 13 1 8 2.3 2 123 64 -20 10 2 -18 50 37 -20 14 19 -18 46 23 0.39 172 0 0 -20 7 55 1 8 2.9 3 122 63 -20 47 47 -19 28 15 -20 52 4 -19 24 1 0.40 173 0 0 -20 45 38 1 8 3.7 4 122 62 -21 25 33 -20 5 55 -21 29 51 -20 1 41 0.40 174 0 0 -21 23 20 1 8 4.8 5 122 61 -22 3 19 -20 43 35 -22 7 36 -20 39 21 0.40 175 0 0 -22 1 1 1 8 6.1 6 121 60 -22 41 2 -21 21 14 -22 45 20 -21 16 59 0.40 176 0 0 -22 38 39 1 8 7.7 8 121 59 -23 18 42 -21 58 50 -23 23 0 -21 54 35 0.40 177 0 0 -23 16 13 1 8 9.5 9 120 58 -23 56 17 -22 36 22 -24 0 35 -22 32 7 0.40 178 0 0 -23 53 41 1 8 11.5 10 120 57 -24 33 46 -23 13 49 -24 38 4 -23 9 33 0.40 179 0 0 -24 31 2 1 8 13.8 11 120 56 -25 11 8 -23 51 9 -25 15 26 -23 46 53 0.40 -180 0 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-27 27 51 -28 52 5 -27 23 36 0.43 - 9 0 0 -27 31 26 1 26 9.0 18 243 -64 -28 11 31 -26 51 33 -28 15 50 -26 47 18 0.43 - 8 0 0 -26 54 54 1 26 12.7 17 243 -64 -27 35 1 -26 15 1 -27 39 20 -26 10 45 0.43 - 7 0 0 -26 18 10 1 26 16.2 16 242 -64 -26 58 17 -25 38 16 -27 2 36 -25 34 0 0.43 - 6 0 0 -25 41 13 1 26 19.5 15 242 -64 -26 21 21 -25 1 19 -26 25 39 -24 57 3 0.43 - 5 0 0 -25 4 6 1 26 22.5 14 241 -64 -25 44 13 -24 24 11 -25 48 32 -24 19 56 0.44 - 4 0 0 -24 26 49 1 26 25.4 13 241 -64 -25 6 56 -23 46 55 -25 11 14 -23 42 39 0.44 - 3 0 0 -23 49 23 1 26 28.0 11 241 -64 -24 29 30 -23 9 30 -24 33 48 -23 5 15 0.44 - 2 0 0 -23 11 51 1 26 30.4 10 240 -63 -23 51 56 -22 32 0 -23 56 15 -22 27 44 0.45 - 1 0 0 -22 34 14 1 26 32.5 9 240 -63 -23 14 17 -21 54 24 -23 18 35 -21 50 8 0.45 0 0 0 -21 56 32 1 26 34.4 8 239 -63 -22 36 33 -21 16 44 -22 40 51 -21 12 29 0.46 1 0 0 -21 18 47 1 26 36.1 7 239 -62 -21 58 46 -20 39 1 -22 3 4 -20 34 46 0.47 2 0 0 -20 41 1 1 26 37.5 6 239 -62 -21 20 57 -20 1 17 -21 25 14 -19 57 3 0.48 3 0 0 -20 3 14 1 26 38.7 5 238 -61 -20 43 7 -19 23 34 -20 47 24 -19 19 20 0.50 4 0 0 -19 25 29 1 26 39.6 4 238 -61 -20 5 19 -18 45 52 -20 9 35 -18 41 38 0.53 5 0 0 -18 47 46 1 26 40.3 2 238 -60 -19 27 32 -18 8 13 -19 31 48 -18 3 59 0.58 6 0 0 -18 10 7 1 26 40.8 1 237 -59 -18 49 49 -17 30 37 -18 54 5 -17 26 24 0.73 7 0 0 -17 32 33 1 26 40.9 0 237 -59 -18 12 11 .. .. .. -18 16 26 .. .. .. 2.73 Uncertainty in time = +/- 3 secs Prediction of 2023 Jul 15.5 Data for the target star ------------------------ * name: TYC 7393-01504-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 24 13.8409 DE: -31 22 45.345 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 24 13.8407 DE: -31 22 45.345 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.0 * B mag [mag]: 11.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (42) Isis asteroid class: Barbarian approx. diameter [km]: 113 approx. diameter ["]: 0.116 distance from Earth [AU]: 1.33840 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#120 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): 0.030", 0.002", 100.894° remarks: * orbital elements for (42)Isis : Mean anomaly = 350.1377203887 deg Arg. of pericenter = 237.2540526989 deg Long. of node = 84.1659853100 deg Inclination = 8.5112278439 deg Eccentricity = 0.2220058537 Semimajor axis = 2.4426281675 AU Perihelion dist = 1.9003504158 AU Mag: H = 7.61, G = 0.15 Epoch of elements : MJD 60562.05372192 TDT (2024 Sep 09.0537) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1202023Apr24,10.62,2024,9,9,1.289323,0.003673,-0.358103,6.004997,0.059819,0.004811,0.000444,0.000000,0.000000 -91.4691,-31.3676,159.99,5.18,False TYC 7393-01504-1,18.40384472,-31.3792624,11.15,10.97,10.87,0.0,0,,18.43059136,-31.3676059,0.74,0.58,0,0,0 42,Isis,10.95,113.026,1.3384,0,0,3.082,0.40,,6.0,0 0,349.8657,2024,9,8,237.2541,84.1660,8.5112,0.22201,2.44263,1.90035,7.61,5.0,0.15 1.054,0.0303,0.0016,101,0.0062,Known errors,0.71,0,-1,-1 20240909_1504-1,60140.55 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 13:12 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org