IOTA/IOTA-ES occultation update for (7) Iris / UCAC4 395-123767 event on 2024 Oct 07, 18:50 UT Visible from Summary ------- On 2024 Oct 07 UT, the 222.337 km diameter asteroid (7) Iris will occult a 11.2 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 0.18 mag to 9.31 mag (the magnitude of the asteroid) for at most 35.840 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 07, 18:33 - 2024 Oct 07, 19:08 * geocentric midpoint of event [JD]: 2460591.28531242 * magnitude of target star: 11.18 * magnitude drop [mag]: 0.18 * estimated maximum duration [s]: 35.840 * Moon: 21 % sunlit, 60° distance * Sun: 113° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 222 * 1 sigma uncertainty interval [path widths]: +/- 0.07 * 1 sigma uncertainty interval [seconds]: +/- 4.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.023, +/- 0.014) * 1 sigma uncertainty ellipse (major, minor, PA): (0.024", 0.012", 69°) * approx speed of asteroid's shadow [km/s]: 6.2032 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 395-123767 by 7 Iris on 2024 Oct 7 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 - 76 0 0 0 30 30 18 33 42.3 1 101 64 - 0 31 1 1 31 58 - 0 39 50 1 40 47 .... - 75 0 0 0 18 41 18 33 42.6 2 101 63 - 0 42 50 1 20 10 - 0 51 39 1 28 59 0.07 - 74 0 0 0 6 50 18 33 43.3 3 101 62 - 0 54 41 1 8 20 - 1 3 30 1 17 8 0.05 - 73 0 0 - 0 5 3 18 33 44.3 4 101 61 - 1 6 35 0 56 27 - 1 15 24 1 5 16 0.05 - 72 0 0 - 0 16 58 18 33 45.7 5 101 60 - 1 18 30 0 44 32 - 1 27 20 0 53 21 0.04 - 71 0 0 - 0 28 55 18 33 47.3 6 101 59 - 1 30 27 0 32 36 - 1 39 17 0 41 25 0.04 - 70 0 0 - 0 40 53 18 33 49.3 7 101 58 - 1 42 26 0 20 38 - 1 51 15 0 29 27 0.04 - 69 0 0 - 0 52 53 18 33 51.7 8 101 57 - 1 54 26 0 8 38 - 2 3 15 0 17 27 0.04 - 68 0 0 - 1 4 53 18 33 54.3 9 101 56 - 2 6 26 - 0 3 22 - 2 15 16 0 5 27 0.04 - 67 0 0 - 1 16 55 18 33 57.3 10 101 55 - 2 18 28 - 0 15 23 - 2 27 18 - 0 6 34 0.04 - 66 0 0 - 1 28 56 18 34 0.7 11 101 54 - 2 30 30 - 0 27 25 - 2 39 19 - 0 18 36 0.04 - 65 0 0 - 1 40 59 18 34 4.3 12 101 53 - 2 42 32 - 0 39 27 - 2 51 22 - 0 30 38 0.04 - 64 0 0 - 1 53 1 18 34 8.3 13 101 52 - 2 54 34 - 0 51 29 - 3 3 24 - 0 42 40 0.03 - 63 0 0 - 2 5 3 18 34 12.7 14 101 51 - 3 6 36 - 1 3 31 - 3 15 26 - 0 54 42 0.03 - 62 0 0 - 2 17 4 18 34 17.4 15 101 50 - 3 18 38 - 1 15 33 - 3 27 27 - 1 6 44 0.03 - 61 0 0 - 2 29 5 18 34 22.3 16 101 49 - 3 30 38 - 1 27 34 - 3 39 28 - 1 18 45 0.03 - 60 0 0 - 2 41 5 18 34 27.7 17 101 48 - 3 42 38 - 1 39 34 - 3 51 28 - 1 30 45 0.03 - 59 0 0 - 2 53 4 18 34 33.3 18 101 47 - 3 54 36 - 1 51 33 - 4 3 26 - 1 42 44 0.03 - 58 0 0 - 3 5 1 18 34 39.3 19 101 46 - 4 6 33 - 2 3 31 - 4 15 23 - 1 54 42 0.03 - 57 0 0 - 3 16 56 18 34 45.7 20 101 45 - 4 18 28 - 2 15 26 - 4 27 18 - 2 6 37 0.03 - 56 0 0 - 3 28 50 18 34 52.3 21 100 44 - 4 30 21 - 2 27 20 - 4 39 11 - 2 18 31 0.03 - 55 0 0 - 3 40 41 18 34 59.3 22 100 43 - 4 42 12 - 2 39 12 - 4 51 1 - 2 30 23 0.03 - 54 0 0 - 3 52 29 18 35 6.6 23 100 42 - 4 54 0 - 2 51 1 - 5 2 49 - 2 42 12 0.03 - 53 0 0 - 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7 54 59 19 5 30.3 31 262 -75 - 8 56 6 - 6 53 54 - 9 4 51 - 6 45 9 0.03 66 0 0 - 7 45 23 19 5 39.8 30 262 -76 - 8 46 31 - 6 44 16 - 8 55 17 - 6 35 31 0.03 67 0 0 - 7 35 39 19 5 49.0 29 262 -76 - 8 36 48 - 6 34 31 - 8 45 34 - 6 25 45 0.03 68 0 0 - 7 25 47 19 5 58.0 28 261 -76 - 8 26 58 - 6 24 38 - 8 35 44 - 6 15 53 0.03 69 0 0 - 7 15 49 19 6 6.6 27 261 -77 - 8 17 0 - 6 14 38 - 8 25 47 - 6 5 53 0.03 70 0 0 - 7 5 43 19 6 14.9 26 261 -77 - 8 6 56 - 6 4 32 - 8 15 42 - 5 55 45 0.03 71 0 0 - 6 55 30 19 6 22.9 25 261 -77 - 7 56 44 - 5 54 18 - 8 5 31 - 5 45 32 0.03 72 0 0 - 6 45 11 19 6 30.6 24 261 -77 - 7 46 26 - 5 43 57 - 7 55 13 - 5 35 11 0.03 73 0 0 - 6 34 45 19 6 38.0 23 261 -77 - 7 36 2 - 5 33 31 - 7 44 49 - 5 24 44 0.03 74 0 0 - 6 24 14 19 6 45.0 22 261 -77 - 7 25 31 - 5 22 58 - 7 34 18 - 5 14 11 0.03 75 0 0 - 6 13 36 19 6 51.8 21 261 -77 - 7 14 54 - 5 12 20 - 7 23 42 - 5 3 33 0.03 76 0 0 - 6 2 53 19 6 58.2 20 260 -77 - 7 4 12 - 5 1 35 - 7 13 0 - 4 52 48 0.03 77 0 0 - 5 52 4 19 7 4.3 19 260 -76 - 6 53 24 - 4 50 46 - 7 2 12 - 4 41 59 0.03 78 0 0 - 5 41 10 19 7 10.1 18 260 -76 - 6 42 32 - 4 39 51 - 6 51 19 - 4 31 4 0.03 79 0 0 - 5 30 12 19 7 15.5 17 260 -76 - 6 31 34 - 4 28 51 - 6 40 22 - 4 20 4 0.03 80 0 0 - 5 19 8 19 7 20.7 16 260 -75 - 6 20 31 - 4 17 47 - 6 29 19 - 4 9 0 0.03 81 0 0 - 5 8 0 19 7 25.5 15 260 -74 - 6 9 24 - 4 6 38 - 6 18 12 - 3 57 51 0.03 82 0 0 - 4 56 48 19 7 30.0 13 260 -74 - 5 58 13 - 3 55 25 - 6 7 1 - 3 46 38 0.04 83 0 0 - 4 45 32 19 7 34.1 12 260 -73 - 5 46 57 - 3 44 9 - 5 55 46 - 3 35 21 0.04 84 0 0 - 4 34 12 19 7 37.9 11 260 -73 - 5 35 38 - 3 32 48 - 5 44 26 - 3 24 0 0.04 85 0 0 - 4 22 49 19 7 41.4 10 260 -72 - 5 24 15 - 3 21 24 - 5 33 4 - 3 12 36 0.04 86 0 0 - 4 11 22 19 7 44.6 9 260 -71 - 5 12 49 - 3 9 57 - 5 21 38 - 3 1 9 0.04 87 0 0 - 3 59 52 19 7 47.4 8 259 -70 - 5 1 20 - 2 58 27 - 5 10 9 - 2 49 39 0.04 88 0 0 - 3 48 20 19 7 50.0 7 259 -70 - 4 49 48 - 2 46 54 - 4 58 37 - 2 38 6 0.04 89 0 0 - 3 36 45 19 7 52.1 6 259 -69 - 4 38 14 - 2 35 18 - 4 47 2 - 2 26 30 0.04 90 0 0 - 3 25 8 19 7 54.0 5 259 -68 - 4 26 37 - 2 23 41 - 4 35 26 - 2 14 52 0.05 91 0 0 - 3 13 29 19 7 55.5 4 259 -67 - 4 14 58 - 2 12 1 - 4 23 47 - 2 3 13 0.05 92 0 0 - 3 1 47 19 7 56.7 3 259 -66 - 4 3 17 - 2 0 20 - 4 12 6 - 1 51 31 0.06 93 0 0 - 2 50 5 19 7 57.6 2 259 -65 - 3 51 35 - 1 48 37 - 4 0 24 - 1 39 48 0.07 94 0 0 - 2 38 21 19 7 58.1 1 259 -64 - 3 39 51 - 1 36 53 - 3 48 40 - 1 28 4 0.10 95 0 0 - 2 26 36 19 7 58.4 0 259 -64 - 3 28 6 .. .. .. - 3 36 55 .. .. .. 0.54 Uncertainty in time = +/- 4 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 395-123767 * constellation : Capricornus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 33 05.8742 DE: -11 06 09.937 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 33 05.8740 DE: -11 06 09.938 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.2 * B mag [mag]: 11.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (7) Iris asteroid class: approx. diameter [km]: 222 approx. diameter ["]: 0.204 distance from Earth [AU]: 1.50200 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#126 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): 0.024", 0.012", 69.043° remarks: * orbital elements for (7)Iris : Mean anomaly = 312.2943929891 deg Arg. of pericenter = 145.5190759874 deg Long. of node = 259.4989195624 deg Inclination = 5.5194795896 deg Eccentricity = 0.2298561845 Semimajor axis = 2.3860510133 AU Perihelion dist = 1.8376024315 AU Mag: H = 5.63, G = 0.15 Epoch of elements : MJD 60590.78531208 TDT (2024 Oct 07.7853) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1262023Apr24,35.84,2024,10,7,18.847498,-0.000146,-0.015872,3.500019,-0.093786,0.004889,0.000985,0.000000,0.000000 8.9947,-11.0181,-105.81,-5.91,False UCAC4 395-123767,20.55163175,-11.1027603,11.57,11.18,10.97,0.0,0,,20.57429466,-11.0180811,0.18,0.15,0,0,0 7,Iris,9.31,222.337,1.5020,0,0,1.393,-0.54,,15.2,0 0,312.0844,2024,10,7,145.5191,259.4989,5.5195,0.22986,2.38605,1.83760,5.63,5.0,0.15 1.072,0.0240,0.0123,69,0.0146,Known errors,0.82,0,-1,-1 20241007_123767,60140.62 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 14:49 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org