IOTA/IOTA-ES occultation update for (42) Isis / UCAC4 297-215560 event on 2024 Oct 05, 01:33 UT Visible from Summary ------- On 2024 Oct 05 UT, the 112.962320158366 km diameter asteroid (42) Isis will occult a 11.7 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 0.59 mag to 11.35 mag (the magnitude of the asteroid) for at most 5.880 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 Oct 05, 01:27 - 2024 Oct 05, 01:38 * geocentric midpoint of event [JD]: 2460588.56485862 * magnitude of target star: 11.70 * magnitude drop [mag]: 0.59 * estimated maximum duration [s]: 5.880 * Moon: 5 % sunlit, 67° distance * Sun: 92° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 116 * 1 sigma uncertainty interval [path widths]: +/- 0.06 * 1 sigma uncertainty interval [seconds]: +/- 1.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.027, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.027", 0.001", 96°) * approx speed of asteroid's shadow [km/s]: 19.2295 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 297-215560 by 42 Isis on 2024 Oct 5 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 164 0 0 4 48 21 1 28 1.1 1 121 77 4 11 49 5 24 58 4 7 20 5 29 29 .... 165 0 0 4 12 40 1 28 1.2 2 121 77 3 36 12 4 49 13 3 31 44 4 53 43 -0.05 166 0 0 3 37 13 1 28 1.5 3 121 76 3 0 50 4 13 42 2 56 22 4 18 11 -0.12 167 0 0 3 2 1 1 28 1.9 4 121 76 2 25 42 3 38 26 2 21 15 3 42 55 -0.15 168 0 0 2 27 6 1 28 2.4 5 121 75 1 50 52 3 3 26 1 46 25 3 7 54 -0.17 169 0 0 1 52 28 1 28 3.1 6 121 75 1 16 18 2 28 43 1 11 52 2 33 11 -0.18 170 0 0 1 18 8 1 28 4.0 8 121 74 0 42 4 1 54 18 0 37 38 1 58 45 -0.18 171 0 0 0 44 7 1 28 4.9 9 121 73 0 8 8 1 20 13 0 3 43 1 24 39 -0.19 172 0 0 0 10 27 1 28 6.0 10 121 72 - 0 25 27 0 46 27 - 0 29 51 0 50 53 -0.19 173 0 0 - 0 22 52 1 28 7.3 11 121 72 - 0 58 41 0 13 2 - 1 3 5 0 17 28 -0.20 174 0 0 - 0 55 50 1 28 8.6 12 121 71 - 1 31 33 - 0 20 1 - 1 35 56 - 0 15 36 -0.20 175 0 0 - 1 28 24 1 28 10.1 13 121 70 - 2 4 2 - 0 52 41 - 2 8 24 - 0 48 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Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 297-215560 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 05 09.3179 DE: -30 43 44.481 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 05 09.3179 DE: -30 43 44.481 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.7 * B mag [mag]: 12.6 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (42) Isis asteroid class: Barbarian approx. diameter [km]: 113 approx. diameter ["]: 0.099 distance from Earth [AU]: 1.58120 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): 0.027", 0.001", 95.505° remarks: * orbital elements for (42)Isis : Mean anomaly = 356.8521913252 deg Arg. of pericenter = 237.2554046919 deg Long. of node = 84.1660510390 deg Inclination = 8.5112370374 deg Eccentricity = 0.2219906603 Semimajor axis = 2.4425789673 AU Perihelion dist = 1.9003492496 AU Mag: H = 7.61, G = 0.15 Epoch of elements : MJD 60588.06485870 TDT (2024 Oct 05.0649) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1202023Apr24,5.88,2024,10,5,1.556607,-0.029651,0.227554,10.764369,1.389557,0.005135,0.000623,0.000000,0.000000 -110.8905,-30.6933,153.75,-4.87,False UCAC4 297-215560,19.08592167,-30.7290225,12.63,11.70,11.20,0.1,0,,19.11229209,-30.6933293,0.59,0.61,0,0,0 42,Isis,11.35,113.077,1.5812,0,0,4.642,7.74,,6.0,0 0,356.5773,2024,10,4,237.2554,84.1661,8.5112,0.22199,2.44258,1.90035,7.61,5.0,0.15 1.061,0.0267,0.0012,96,0.0061,Known errors,0.90,0,-1,-1 20241005_215560,60140.61 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 14:39 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org