IOTA/IOTA-ES occultation update for (939) Isberga / UCAC4 325-115595 event on 2024 Sep 05, 01:25 UT Visible from Summary ------- On 2024 Sep 05 UT, the 10.3037645761278 km diameter asteroid (939) Isberga will occult a 11.2 mag star in the constellation Ophiuchus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.26 mag to 15.46 mag (the magnitude of the asteroid) for at most 0.850 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: 97 * date and approx. time of event: 2024 Sep 05, 01:17 - 2024 Sep 05, 01:34 * geocentric midpoint of event [JD]: 2460558.55970870 * magnitude of target star: 11.22 * magnitude drop [mag]: 4.26 * estimated maximum duration [s]: 0.850 * Moon: 4 % sunlit, 82° distance * Sun: 103° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 11 * 1 sigma uncertainty interval [path widths]: +/- 0.40 * 1 sigma uncertainty interval [seconds]: +/- 1.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.018, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.018", 0.004", 88°) * approx speed of asteroid's shadow [km/s]: 12.3439 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 325-115595 by 939 Isberga on 2024 Sep 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 162 0 0 -21 43 4 1 17 49.5 1 117 62 -21 46 28 -21 39 41 -21 49 11 -21 36 58 .... 163 0 0 -22 11 47 1 17 49.8 2 117 61 -22 15 11 -22 8 24 -22 17 54 -22 5 41 0.34 164 0 0 -22 40 24 1 17 50.2 3 116 60 -22 43 48 -22 37 0 -22 46 30 -22 34 18 0.35 165 0 0 -23 8 53 1 17 50.7 4 116 60 -23 12 17 -23 5 30 -23 15 0 -23 2 48 0.35 166 0 0 -23 37 15 1 17 51.5 5 115 59 -23 40 39 -23 33 51 -23 43 21 -23 31 9 0.35 167 0 0 -24 5 28 1 17 52.4 6 115 59 -24 8 51 -24 2 4 -24 11 34 -23 59 22 0.35 168 0 0 -24 33 31 1 17 53.5 7 115 58 -24 36 55 -24 30 8 -24 39 37 -24 27 26 0.35 169 0 0 -25 1 24 1 17 54.8 8 114 57 -25 4 48 -24 58 1 -25 7 30 -24 55 19 0.35 170 0 0 -25 29 7 1 17 56.2 9 114 57 -25 32 30 -25 25 44 -25 35 12 -25 23 2 0.35 171 0 0 -25 56 38 1 17 57.8 10 113 56 -26 0 1 -25 53 15 -26 2 43 -25 50 33 0.35 172 0 0 -26 23 57 1 17 59.6 11 113 55 -26 27 20 -26 20 34 -26 30 1 -26 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247 -77 -17 40 55 -17 34 7 -17 43 37 -17 31 25 0.38 - 16 0 0 -17 8 1 1 33 59.1 11 247 -77 -17 11 25 -17 4 37 -17 14 7 -17 1 55 0.39 - 15 0 0 -16 38 33 1 34 0.9 9 246 -77 -16 41 57 -16 35 10 -16 44 39 -16 32 28 0.39 - 14 0 0 -16 9 8 1 34 2.5 8 246 -76 -16 12 32 -16 5 45 -16 15 14 -16 3 3 0.40 - 13 0 0 -15 39 47 1 34 3.9 7 246 -76 -15 43 10 -15 36 24 -15 45 52 -15 33 42 0.40 - 12 0 0 -15 10 30 1 34 5.1 6 246 -76 -15 13 53 -15 7 7 -15 16 35 -15 4 25 0.41 - 11 0 0 -14 41 19 1 34 6.2 5 245 -75 -14 44 41 -14 37 56 -14 47 23 -14 35 14 0.42 - 10 0 0 -14 12 13 1 34 7.0 4 245 -74 -14 15 36 -14 8 51 -14 18 17 -14 6 10 0.44 - 9 0 0 -13 43 15 1 34 7.6 3 245 -74 -13 46 37 -13 39 53 -13 49 19 -13 37 12 0.48 - 8 0 0 -13 14 25 1 34 8.1 2 245 -73 -13 17 47 -13 11 3 -13 20 28 -13 8 22 0.55 - 7 0 0 -12 45 43 1 34 8.3 1 244 -72 -12 49 4 -12 42 21 -12 51 45 -12 39 40 0.82 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.5 Data for the target star ------------------------ * name: UCAC4 325-115595 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 42 27.9749 DE: -25 08 16.666 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 42 27.9749 DE: -25 08 16.666 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.2 * B mag [mag]: 12.7 * Diameter [mas]: 0.20 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (939) Isberga asteroid class: asteroid system: multiple bodies approx. diameter [km]: 10 approx. diameter ["]: 0.010 distance from Earth [AU]: 1.40110 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): 0.018", 0.004", 88.229° remarks: * orbital elements for (939)Isberga : Mean anomaly = 334.5264579578 deg Arg. of pericenter = 6.1864258583 deg Long. of node = 327.0341067696 deg Inclination = 2.5828329160 deg Eccentricity = 0.1763462063 Semimajor axis = 2.2471007514 AU Perihelion dist = 1.8508330588 AU Mag: H = 12.01, G = 0.15 Epoch of elements : MJD 60558.05970880 TDT (2024 Sep 05.0597) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#532023Apr24,0.85,2024,9,5,1.433009,0.027650,-0.318479,6.940881,0.605311,0.004941,-0.000102,0.000000,0.000000 -100.1489,-25.1509,158.18,6.68,False UCAC4 325-115595,17.70777084,-25.1379629,12.68,11.22,10.43,0.2,0,,17.73318605,-25.1508578,4.26,4.60,0,0,1 939,Isberga,15.46,10.507,1.4011,0,1,3.209,3.80,,1.0,0 ,3.6,33,1.109600,0.1000,,,,, 0,334.2164,2024,9,4,6.1864,327.0341,2.5828,0.17635,2.24710,1.85083,12.00,5.0,0.15 1.398,0.0177,0.0040,88,0.0041,Known errors,0.69,0,-1,-1 20240905_115595,60140.54 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 13:00 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org