IOTA/IOTA-ES occultation update for (2320) Blarney / UCAC4 365-144319 event on 2023 Jun 25, 09:33 UT Visible from South America, New Zealand, Australia Summary ------- On 2023 Jun 25 UT, the 36.4 km diameter asteroid (2320) Blarney will occult a 11.6 mag star in the constellation Sagittarius for observers along a path across South America, New Zealand, Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.61 mag to 15.19 mag (the magnitude of the asteroid) for at most 2.750 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: 95 * date and approx. time of event: 2023 Jun 25, 09:26 - 2023 Jun 25, 09:41 * geocentric midpoint of event [JD]: 2460120.89862600 * magnitude of target star: 11.62 * magnitude drop [mag]: 3.61 * estimated maximum duration [s]: 2.750 * Moon: 42 % sunlit, 105° distance * Sun: 172° distance * rough path description: South America, New Zealand, Australia The occultation path -------------------- * approximate projected width [km]: 38 * 1 sigma uncertainty interval [path widths]: +/- 0.44 * 1 sigma uncertainty interval [seconds]: +/- 2.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.026, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.026", 0.002", 97°) * approx speed of asteroid's shadow [km/s]: 13.2521 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 365-144319 by 2320 Blarney on 2023 Jun 25 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 122 0 0 -28 39 18 9 41 47.8 0 109 -8 -28 28 33 -28 50 3 -28 19 1 -28 59 36 .... 123 0 0 -28 57 45 9 41 47.6 1 109 -9 -28 47 1 -29 8 29 -28 37 30 -29 18 1 0.24 124 0 0 -29 15 52 9 41 47.4 2 108 -10 -29 5 9 -29 26 35 -28 55 39 -29 36 6 0.24 125 0 0 -29 33 40 9 41 47.0 3 108 -11 -29 22 58 -29 44 22 -29 13 29 -29 53 52 0.24 126 0 0 -29 51 8 9 41 46.4 4 107 -12 -29 40 27 -30 1 49 -29 30 59 -30 11 19 0.24 127 0 0 -30 8 17 9 41 45.8 5 107 -13 -29 57 37 -30 18 57 -29 48 9 -30 28 25 0.24 128 0 0 -30 25 5 9 41 45.0 6 106 -14 -30 14 27 -30 35 44 -30 5 0 -30 45 12 0.24 129 0 0 -30 41 34 9 41 44.1 7 106 -15 -30 30 57 -30 52 12 -30 21 31 -31 1 39 0.24 130 0 0 -30 57 43 9 41 43.1 8 105 -16 -30 47 7 -31 8 20 -30 37 42 -31 17 46 0.24 131 0 0 -31 13 32 9 41 42.0 9 105 -16 -31 2 57 -31 24 8 -30 53 33 -31 33 33 0.24 132 0 0 -31 29 1 9 41 40.8 10 104 -17 -31 18 26 -31 39 36 -31 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7 - 7 37 29 0.25 - 69 0 0 - 6 52 32 9 26 59.7 25 254 -19 - 6 41 36 - 7 3 29 - 6 31 53 - 7 13 13 0.25 - 68 0 0 - 6 28 26 9 26 55.9 24 254 -18 - 6 17 31 - 6 39 23 - 6 7 49 - 6 49 6 0.25 - 67 0 0 - 6 4 30 9 26 52.3 23 254 -17 - 5 53 34 - 6 15 25 - 5 43 53 - 6 25 8 0.25 - 66 0 0 - 5 40 42 9 26 48.9 21 254 -16 - 5 29 48 - 5 51 37 - 5 20 7 - 6 1 19 0.25 - 65 0 0 - 5 17 5 9 26 45.6 20 254 -15 - 5 6 11 - 5 27 59 - 4 56 31 - 5 37 41 0.25 - 64 0 0 - 4 53 39 9 26 42.5 19 254 -14 - 4 42 45 - 5 4 32 - 4 33 6 - 5 14 13 0.25 - 63 0 0 - 4 30 23 9 26 39.6 18 253 -13 - 4 19 31 - 4 41 16 - 4 9 52 - 4 50 56 0.25 - 62 0 0 - 4 7 20 9 26 36.8 17 253 -12 - 3 56 28 - 4 18 12 - 3 46 50 - 4 27 51 0.25 - 61 0 0 - 3 44 28 9 26 34.1 16 253 -11 - 3 33 38 - 3 55 20 - 3 24 0 - 4 4 59 0.25 - 60 0 0 - 3 21 50 9 26 31.6 15 253 -10 - 3 11 0 - 3 32 41 - 3 1 23 - 3 42 19 0.25 - 59 0 0 - 2 59 25 9 26 29.3 14 253 -9 - 2 48 36 - 3 10 15 - 2 39 0 - 3 19 52 0.26 - 58 0 0 - 2 37 14 9 26 27.2 13 253 -8 - 2 26 25 - 2 48 2 - 2 16 50 - 2 57 39 0.26 - 57 0 0 - 2 15 17 9 26 25.2 12 253 -6 - 2 4 29 - 2 26 5 - 1 54 54 - 2 35 41 0.26 - 56 0 0 - 1 53 34 9 26 23.4 11 253 -5 - 1 42 48 - 2 4 21 - 1 33 14 - 2 13 57 0.26 - 55 0 0 - 1 32 7 9 26 21.7 10 253 -4 - 1 21 22 - 1 42 54 - 1 11 48 - 1 52 28 0.26 - 54 0 0 - 1 10 56 9 26 20.2 9 253 -3 - 1 0 11 - 1 21 41 - 0 50 39 - 1 31 15 0.27 - 53 0 0 - 0 50 1 9 26 18.9 8 253 -2 - 0 39 17 - 1 0 45 - 0 29 45 - 1 10 18 0.27 - 52 0 0 - 0 29 22 9 26 17.8 7 253 -1 - 0 18 39 - 0 40 6 - 0 9 8 - 0 49 38 0.27 - 51 0 0 - 0 9 0 9 26 16.8 6 253 0 0 1 42 - 0 19 43 0 11 12 - 0 29 14 0.28 - 50 0 0 0 11 4 9 26 16.0 5 253 1 0 21 45 0 0 22 0 31 14 - 0 9 8 0.29 - 49 0 0 0 30 50 9 26 15.3 4 253 2 0 41 31 0 20 10 0 50 59 0 10 40 0.31 - 48 0 0 0 50 19 9 26 14.8 3 253 3 1 0 58 0 39 39 1 10 26 0 30 10 0.33 - 47 0 0 1 9 28 9 26 14.5 1 253 4 1 20 7 0 58 49 1 29 34 0 49 22 0.40 - 46 0 0 1 28 19 9 26 14.4 0 253 5 1 38 57 1 17 41 1 48 23 1 8 14 0.77 Uncertainty in time = +/- 3 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4 365-144319 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 37 34.1641 DE: -17 05 32.537 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 37 34.1641 DE: -17 05 32.537 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2320) Blarney asteroid class: approx. diameter [km]: 36 approx. diameter ["]: 0.023 distance from Earth [AU]: 2.19090 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#84 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): 0.026", 0.002", 96.87° remarks: * orbital elements for (2320)Blarney : Mean anomaly = 272.7448379127 deg Arg. of pericenter = 261.2583321208 deg Long. of node = 118.0598650657 deg Inclination = 11.4922255029 deg Eccentricity = 0.1337583162 Semimajor axis = 3.1639514502 AU Perihelion dist = 2.7407466318 AU Mag: H = 10.67, G = 0.15 Epoch of elements : MJD 60120.39854167 TDT (2023 Jun 25.3985) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#842023Apr24,2.75,2023,6,25,9.567024,0.065662,-0.233617,-7.200442,-2.025367,-0.000494,-0.000629,0.000001,0.000000 -137.0395,-17.0725,37.15,23.39,False UCAC4 365-144319,18.62615669,-17.0923715,0.00,11.62,0.00,0.0,0,,18.64908475,-17.0725233,3.61,0.00,0,0,0 2320,Blarney,15.19,36.4,2.1909,0,0,-2.016,-8.13,,2.0,0 0,272.6750,2023,6,25,261.2583,118.0599,11.4922,0.13376,3.16395,2.74075,10.68,5.0,0.15 1.444,0.0260,0.0021,97,0.0102,Known errors,-1.00,-1,-1,-1 20230625_144319,60063.20 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:44 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org