IOTA/IOTA-ES occultation update for (939) Isberga / UCAC4 337-185780 event on 2024 Oct 27, 19:08 UT Visible from Summary ------- On 2024 Oct 27 UT, the 10.34 km diameter asteroid (939) Isberga will occult a 11.9 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 4.18 mag to 16.04 mag (the magnitude of the asteroid) for at most 0.360 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: 96 * date and approx. time of event: 2024 Oct 27, 19:04 - 2024 Oct 27, 19:11 * geocentric midpoint of event [JD]: 2460611.29725346 * magnitude of target star: 11.88 * magnitude drop [mag]: 4.18 * estimated maximum duration [s]: 0.360 * Moon: 19 % sunlit, 125° distance * Sun: 73° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 10 * 1 sigma uncertainty interval [path widths]: +/- 0.41 * 1 sigma uncertainty interval [seconds]: +/- 0.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.003", 77°) * approx speed of asteroid's shadow [km/s]: 28.8535 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 337-185780 by 939 Isberga on 2024 Oct 27 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 -129 0 0 -16 21 20 19 4 23.5 1 113 71 -16 24 25 -16 18 15 -16 26 58 -16 15 42 .... -128 0 0 -16 46 19 19 4 23.6 2 113 72 -16 49 24 -16 43 14 -16 51 57 -16 40 42 0.17 -127 0 0 -17 11 4 19 4 23.8 3 113 73 -17 14 9 -17 8 0 -17 16 41 -17 5 27 0.16 -126 0 0 -17 35 35 19 4 24.0 4 112 74 -17 38 40 -17 32 31 -17 41 12 -17 29 59 0.15 -125 0 0 -17 59 51 19 4 24.3 5 112 75 -18 2 55 -17 56 47 -18 5 27 -17 54 15 0.15 -124 0 0 -18 23 52 19 4 24.7 6 112 76 -18 26 56 -18 20 48 -18 29 28 -18 18 16 0.14 -123 0 0 -18 47 37 19 4 25.2 7 112 76 -18 50 40 -18 44 33 -18 53 12 -18 42 1 0.14 -122 0 0 -19 11 5 19 4 25.7 8 111 77 -19 14 8 -19 8 2 -19 16 40 -19 5 30 0.14 -121 0 0 -19 34 17 19 4 26.3 9 111 78 -19 37 20 -19 31 14 -19 39 51 -19 28 43 0.14 -120 0 0 -19 57 12 19 4 26.9 10 111 78 -20 0 14 -19 54 9 -20 2 45 -19 51 38 0.14 -119 0 0 -20 19 49 19 4 27.7 11 110 79 -20 22 51 -20 16 46 -20 25 22 -20 14 15 0.14 -118 0 0 -20 42 8 19 4 28.5 12 110 79 -20 45 10 -20 39 6 -20 47 41 -20 36 35 0.14 -117 0 0 -21 4 9 19 4 29.3 13 109 80 -21 7 11 -21 1 7 -21 9 41 -20 58 37 0.14 -116 0 0 -21 25 51 19 4 30.2 14 109 80 -21 28 53 -21 22 50 -21 31 23 -21 20 20 0.14 -115 0 0 -21 47 15 19 4 31.2 15 109 80 -21 50 16 -21 44 13 -21 52 46 -21 41 44 0.14 -114 0 0 -22 8 19 19 4 32.3 16 108 80 -22 11 20 -22 5 18 -22 13 50 -22 2 48 0.14 -113 0 0 -22 29 4 19 4 33.4 17 108 80 -22 32 4 -22 26 3 -22 34 34 -22 23 34 0.14 -112 0 0 -22 49 28 19 4 34.5 18 108 80 -22 52 29 -22 46 28 -22 54 58 -22 43 59 0.14 -111 0 0 -23 9 33 19 4 35.7 19 107 80 -23 12 33 -23 6 33 -23 15 2 -23 4 4 0.13 -110 0 0 -23 29 17 19 4 37.0 20 107 80 -23 32 17 -23 26 18 -23 34 46 -23 23 49 0.13 -109 0 0 -23 48 41 19 4 38.4 21 106 79 -23 51 41 -23 45 42 -23 54 9 -23 43 13 0.13 -108 0 0 -24 7 44 19 4 39.7 22 106 79 -24 10 43 -24 4 45 -24 13 11 -24 2 17 0.13 -107 0 0 -24 26 26 19 4 41.2 23 105 78 -24 29 25 -24 23 27 -24 31 53 -24 20 59 0.13 -106 0 0 -24 44 47 19 4 42.7 24 105 78 -24 47 45 -24 41 48 -24 50 13 -24 39 20 0.13 -105 0 0 -25 2 46 19 4 44.2 25 105 77 -25 5 44 -24 59 47 -25 8 11 -24 57 20 0.13 -104 0 0 -25 20 23 19 4 45.8 26 104 76 -25 23 21 -25 17 25 -25 25 48 -25 14 58 0.13 -103 0 0 -25 37 39 19 4 47.5 27 104 76 -25 40 37 -25 34 42 -25 43 4 -25 32 15 0.13 -102 0 0 -25 54 33 19 4 49.2 28 103 75 -25 57 31 -25 51 36 -25 59 57 -25 49 9 0.13 -101 0 0 -26 11 5 19 4 50.9 29 103 74 -26 14 2 -26 8 8 -26 16 28 -26 5 42 0.13 -100 0 0 -26 27 15 19 4 52.7 30 102 74 -26 30 12 -26 24 18 -26 32 38 -26 21 52 0.13 - 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9 40 23 19 11 12.5 30 249 -43 - 9 43 30 - 9 37 15 - 9 46 5 - 9 34 41 0.14 28 0 0 - 9 12 39 19 11 14.6 29 249 -44 - 9 15 46 - 9 9 31 - 9 18 21 - 9 6 57 0.14 29 0 0 - 8 44 51 19 11 16.6 28 249 -45 - 8 47 59 - 8 41 44 - 8 50 34 - 8 39 9 0.14 30 0 0 - 8 17 2 19 11 18.5 27 249 -47 - 8 20 9 - 8 13 54 - 8 22 44 - 8 11 19 0.14 31 0 0 - 7 49 10 19 11 20.4 25 249 -48 - 7 52 17 - 7 46 2 - 7 54 52 - 7 43 28 0.14 32 0 0 - 7 21 17 19 11 22.2 24 248 -49 - 7 24 24 - 7 18 10 - 7 26 59 - 7 15 35 0.14 33 0 0 - 6 53 24 19 11 23.9 23 248 -50 - 6 56 31 - 6 50 17 - 6 59 6 - 6 47 42 0.14 34 0 0 - 6 25 31 19 11 25.6 22 248 -51 - 6 28 38 - 6 22 24 - 6 31 13 - 6 19 49 0.14 35 0 0 - 5 57 40 19 11 27.2 21 248 -52 - 6 0 47 - 5 54 32 - 6 3 21 - 5 51 58 0.14 36 0 0 - 5 29 50 19 11 28.7 20 248 -53 - 5 32 57 - 5 26 43 - 5 35 32 - 5 24 8 0.14 37 0 0 - 5 2 3 19 11 30.1 19 248 -54 - 5 5 10 - 4 58 56 - 5 7 44 - 4 56 21 0.14 38 0 0 - 4 34 19 19 11 31.4 18 248 -55 - 4 37 26 - 4 31 12 - 4 40 1 - 4 28 38 0.15 39 0 0 - 4 6 40 19 11 32.7 17 248 -56 - 4 9 46 - 4 3 33 - 4 12 21 - 4 0 59 0.15 40 0 0 - 3 39 5 19 11 33.9 16 248 -57 - 3 42 12 - 3 35 58 - 3 44 46 - 3 33 24 0.15 41 0 0 - 3 11 36 19 11 35.0 14 248 -59 - 3 14 42 - 3 8 29 - 3 17 17 - 3 5 55 0.15 42 0 0 - 2 44 13 19 11 36.0 13 247 -60 - 2 47 20 - 2 41 7 - 2 49 54 - 2 38 33 0.15 43 0 0 - 2 16 57 19 11 37.0 12 247 -61 - 2 20 4 - 2 13 51 - 2 22 37 - 2 11 17 0.15 44 0 0 - 1 49 49 19 11 37.8 11 247 -62 - 1 52 55 - 1 46 43 - 1 55 29 - 1 44 9 0.15 45 0 0 - 1 22 49 19 11 38.6 10 247 -63 - 1 25 55 - 1 19 43 - 1 28 29 - 1 17 10 0.16 46 0 0 - 0 55 58 19 11 39.3 9 247 -64 - 0 59 4 - 0 52 53 - 1 1 38 - 0 50 19 0.16 47 0 0 - 0 29 17 19 11 39.9 8 247 -65 - 0 32 23 - 0 26 12 - 0 34 56 - 0 23 39 0.16 48 0 0 - 0 2 47 19 11 40.5 7 247 -66 - 0 5 52 0 0 19 - 0 8 25 0 2 52 0.17 49 0 0 0 23 33 19 11 40.9 6 247 -67 0 20 28 0 26 38 0 17 55 0 29 11 0.17 50 0 0 0 49 41 19 11 41.3 5 247 -68 0 46 36 0 52 46 0 44 4 0 55 19 0.18 51 0 0 1 15 37 19 11 41.6 3 247 -69 1 12 33 1 18 42 1 10 0 1 21 15 0.20 52 0 0 1 41 21 19 11 41.8 2 247 -70 1 38 16 1 44 25 1 35 44 1 46 57 0.22 53 0 0 2 6 50 19 11 42.0 1 247 -71 2 3 46 2 9 55 2 1 14 2 12 27 0.30 54 0 0 2 32 6 19 11 42.0 0 247 -73 2 29 2 2 35 10 2 26 30 2 37 42 1.20 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 337-185780 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 17 47.8207 DE: -22 36 27.466 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 17 47.8206 DE: -22 36 27.466 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.9 * B mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (939) Isberga asteroid class: asteroid system: multiple bodies approx. diameter [km]: 10 approx. diameter ["]: 0.008 distance from Earth [AU]: 1.88160 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#53 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): 0.013", 0.003", 76.94° remarks: * orbital elements for (939)Isberga : Mean anomaly = 349.9524091461 deg Arg. of pericenter = 6.1927341529 deg Long. of node = 327.0337475450 deg Inclination = 2.5828812172 deg Eccentricity = 0.1763164516 Semimajor axis = 2.2470096398 AU Perihelion dist = 1.8508248734 AU Mag: H = 12.01, G = 0.15 Epoch of elements : MJD 60610.79725329 TDT (2024 Oct 27.7973) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#532023Apr24,0.36,2024,10,27,19.134083,0.021912,-0.124277,16.035410,2.844366,0.004936,0.000661,0.000000,0.000000 -33.8241,-22.5640,-111.06,-13.14,False UCAC4 337-185780,19.29661691,-22.6076292,12.37,11.88,11.62,0.0,0,,19.32127770,-22.5640061,4.19,4.00,0,0,0 939,Isberga,16.04,10.340,1.8816,0,1,5.411,13.30,,1.0,0 ,3.6,33,1.109600,0.1000,,,,, 0,349.7191,2024,10,27,6.1927,327.0337,2.5829,0.17632,2.24701,1.85082,12.00,5.0,0.15 1.413,0.0130,0.0031,77,0.0031,Known errors,0.81,0,-1,-1 20241027_185780,60140.66 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:54 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org