IOTA/IOTA-ES occultation update for (177) Irma / UCAC4 355-197334 event on 2024 Jul 02, 09:50 UT Visible from Summary ------- On 2024 Jul 02 UT, the 70.526 km diameter asteroid (177) Irma will occult a 11.9 mag star in the constellation Capricornus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.86 mag to 13.54 mag (the magnitude of the asteroid) for at most 11.170 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 Jul 02, 09:34 - 2024 Jul 02, 10:05 * geocentric midpoint of event [JD]: 2460493.90993125 * magnitude of target star: 11.90 * magnitude drop [mag]: 1.86 * estimated maximum duration [s]: 11.170 * Moon: 14 % sunlit, 106° distance * Sun: 150° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 79 * 1 sigma uncertainty interval [path widths]: +/- 0.09 * 1 sigma uncertainty interval [seconds]: +/- 3.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.017, +/- 0.007) * 1 sigma uncertainty ellipse (major, minor, PA): (0.017", 0.005", 73°) * approx speed of asteroid's shadow [km/s]: 6.3114 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 355-197334 by 177 Irma on 2024 Jul 2 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 135 0 0 -40 42 37 10 5 18.2 0 115 -26 -40 19 16 -41 6 3 -40 15 1 -41 10 20 .... 136 0 0 -41 3 58 10 5 17.9 1 114 -27 -40 40 40 -41 27 22 -40 36 26 -41 31 38 0.44 137 0 0 -41 24 58 10 5 17.4 2 114 -28 -41 1 43 -41 48 19 -40 57 29 -41 52 35 0.46 138 0 0 -41 45 36 10 5 16.7 3 113 -28 -41 22 24 -42 8 54 -41 18 10 -42 13 9 0.46 139 0 0 -42 5 53 10 5 15.7 4 112 -29 -41 42 43 -42 29 8 -41 38 30 -42 33 23 0.47 140 0 0 -42 25 48 10 5 14.6 5 112 -30 -42 2 40 -42 49 0 -41 58 28 -42 53 14 0.47 141 0 0 -42 45 21 10 5 13.2 5 111 -31 -42 22 16 -43 8 30 -42 18 5 -43 12 43 0.47 142 0 0 -43 4 32 10 5 11.6 6 110 -31 -42 41 30 -43 27 38 -42 37 19 -43 31 51 0.47 143 0 0 -43 23 21 10 5 9.8 7 110 -32 -43 0 22 -43 46 25 -42 56 12 -43 50 37 0.48 144 0 0 -43 41 48 10 5 7.8 8 109 -33 -43 18 52 -44 4 49 -43 14 42 -44 9 1 0.48 145 0 0 -43 59 54 10 5 5.6 8 108 -34 -43 37 1 -44 22 52 -43 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-10 47 20 9 35 17.0 3 251 25 -10 24 47 -11 9 57 -10 20 41 -11 14 5 0.63 - 19 0 0 -10 25 44 9 35 16.2 2 251 26 -10 3 14 -10 48 19 - 9 59 8 -10 52 26 0.72 - 18 0 0 -10 4 30 9 35 15.8 1 251 27 - 9 42 2 -10 27 2 - 9 37 57 -10 31 9 1.23 Uncertainty in time = +/- 3 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: UCAC4 355-197334 * constellation : Capricornus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 53 44.1438 DE: -19 08 06.511 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 53 44.1438 DE: -19 08 06.510 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.9 * B mag [mag]: 12.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (177) Irma asteroid class: approx. diameter [km]: 71 approx. diameter ["]: 0.059 distance from Earth [AU]: 1.65900 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#110 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): 0.017", 0.005", 72.887° remarks: * orbital elements for (177)Irma : Mean anomaly = 299.0200535024 deg Arg. of pericenter = 39.6538586202 deg Long. of node = 346.9294535645 deg Inclination = 1.3814492213 deg Eccentricity = 0.2342521226 Semimajor axis = 2.7707542237 AU Perihelion dist = 2.1216991657 AU Mag: H = 9.68, G = 0.15 Epoch of elements : MJD 60493.40993258 TDT (2024 Jul 02.4099) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1102023Apr24,11.17,2024,7,2,9.838350,0.126992,-0.432508,-3.417779,-1.004517,-0.002689,-0.000635,0.000001,0.000000 -114.7180,-19.0416,33.47,22.98,False UCAC4 355-197334,20.89559548,-19.1351419,12.22,11.90,11.73,0.0,0,,20.91911033,-19.0415637,1.86,1.64,0,0,0 177,Irma,13.54,70.526,1.6590,0,0,-1.278,-5.32,,3.4,0 0,298.9325,2024,7,2,39.6539,346.9295,1.3814,0.23425,2.77075,2.12170,9.68,5.0,0.15 1.091,0.0173,0.0053,73,0.0053,Known errors,1.29,0,-1,-1 20240702_197334,60140.18 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 04:19 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org