IOTA/IOTA-ES occultation update for (657) Gunlod / UCAC4-292-181151 event on 2023 Jun 04, 17:41 UT Visible from New Zealand, Africa Summary ------- On 2023 Jun 04 UT, the 37.8 km diameter asteroid (657) Gunlod will occult a 11.9 mag star in the constellation Sagittarius for observers along a path across New Zealand, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.01 mag to 14.83 mag (the magnitude of the asteroid) for at most 4.060 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: 99 * date and approx. time of event: 2023 Jun 04, 17:30 - 2023 Jun 04, 17:52 * geocentric midpoint of event [JD]: 2460100.23687888 * magnitude of target star: 11.89 * magnitude drop [mag]: 3.01 * estimated maximum duration [s]: 4.060 * Moon: 99 % sunlit, 14° distance * Sun: 157° distance * rough path description: New Zealand, Africa Additional comments ------------------- RUWE high The occultation path -------------------- * approximate projected width [km]: 40 * 1 sigma uncertainty interval [path widths]: +/- 0.18 * 1 sigma uncertainty interval [seconds]: +/- 1.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.015", 0.003", 79°) * approx speed of asteroid's shadow [km/s]: 9.3085 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-292-181151 by 657 Gunlod on 2023 Jun 4 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 21 0 0 - 9 19 33 17 51 56.1 1 122 -21 - 9 6 51 - 9 32 15 - 9 2 24 - 9 36 43 .... 22 0 0 - 9 57 23 17 51 55.7 2 122 -23 - 9 44 41 -10 10 7 - 9 40 13 -10 14 36 0.31 23 0 0 -10 35 26 17 51 55.0 3 122 -24 -10 22 42 -10 48 12 -10 18 14 -10 52 40 0.31 24 0 0 -11 13 39 17 51 54.1 4 122 -25 -11 0 54 -11 26 26 -10 56 25 -11 30 56 0.31 25 0 0 -11 52 2 17 51 52.8 5 121 -26 -11 39 15 -12 4 50 -11 34 46 -12 9 20 0.31 26 0 0 -12 30 33 17 51 51.3 7 121 -27 -12 17 44 -12 43 22 -12 13 15 -12 47 52 0.31 27 0 0 -13 9 10 17 51 49.4 8 121 -28 -12 56 20 -13 22 0 -12 51 50 -13 26 31 0.31 28 0 0 -13 47 52 17 51 47.3 9 121 -29 -13 35 2 -14 0 44 -13 30 31 -14 5 15 0.31 29 0 0 -14 26 39 17 51 44.9 10 120 -30 -14 13 47 -14 39 32 -14 9 17 -14 44 3 0.31 30 0 0 -15 5 28 17 51 42.2 11 120 -31 -14 52 36 -15 18 22 -14 48 5 -15 22 54 0.31 31 0 0 -15 44 19 17 51 39.2 12 120 -33 -15 31 26 -15 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9 -30 8 44 -30 34 24 -30 4 15 -30 38 54 0.33 -146 0 0 -29 47 8 17 30 35.3 13 241 10 -29 34 17 -29 59 59 -29 29 47 -30 4 30 0.34 -145 0 0 -29 12 17 17 30 32.4 12 240 11 -28 59 25 -29 25 10 -28 54 54 -29 29 41 0.34 -144 0 0 -28 37 1 17 30 29.8 11 240 12 -28 24 8 -28 49 56 -28 19 37 -28 54 28 0.34 -143 0 0 -28 1 22 17 30 27.4 10 239 13 -27 48 28 -28 14 18 -27 43 56 -28 18 51 0.34 -142 0 0 -27 25 21 17 30 25.2 9 239 14 -27 12 25 -27 38 17 -27 7 53 -27 42 50 0.35 -141 0 0 -26 48 57 17 30 23.3 8 238 15 -26 36 0 -27 1 55 -26 31 27 -27 6 28 0.35 -140 0 0 -26 12 12 17 30 21.6 7 238 17 -25 59 14 -26 25 10 -25 54 41 -26 29 44 0.36 -139 0 0 -25 35 6 17 30 20.1 6 237 18 -25 22 8 -25 48 6 -25 17 34 -25 52 40 0.37 -138 0 0 -24 57 41 17 30 18.9 4 237 19 -24 44 42 -25 10 42 -24 40 9 -25 15 16 0.39 -137 0 0 -24 19 58 17 30 17.9 3 237 20 -24 6 58 -24 33 0 -24 2 25 -24 37 34 0.41 -136 0 0 -23 41 58 17 30 17.2 2 236 21 -23 28 57 -23 55 0 -23 24 24 -23 59 35 0.47 -135 0 0 -23 3 42 17 30 16.8 1 236 22 -22 50 41 -23 16 44 -22 46 7 -23 21 19 0.63 -134 0 0 -22 25 10 17 30 16.6 0 235 23 .. .. .. -22 38 13 .. .. .. -22 42 48 939.60 Uncertainty in time = +/- 2 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4-292-181151 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 25 30.8912 DE: -31 47 17.303 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 25 30.8912 DE: -31 47 17.303 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.400,0.300) * V mag [mag]: 11.9 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (657) Gunlod asteroid class: approx. diameter [km]: 38 approx. diameter ["]: 0.033 distance from Earth [AU]: 1.58620 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#108 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): 0.015", 0.003", 78.68° remarks: * orbital elements for (657)Gunlod : Mean anomaly = 71.5743391450 deg Arg. of pericenter = 244.6009422826 deg Long. of node = 297.5266343486 deg Inclination = 10.2371852661 deg Eccentricity = 0.1133064839 Semimajor axis = 2.6109349136 AU Perihelion dist = 2.3150990589 AU Mag: H = 11.18, G = 0.15 Epoch of elements : MJD 60099.73722222 TDT (2023 Jun 04.7372) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1082023Apr24,4.06,2023,6,4,17.685093,-0.044304,-0.313404,-5.202491,0.733875,-0.002074,0.000649,0.000001,0.000000 118.5809,-31.7748,-85.68,22.46,False UCAC4-292-181151,18.42524754,-31.7881397,0.00,11.89,0.00,0.0,0,,18.45081095,-31.7747643,3.01,0.00,0,0,0 657,Gunlod,14.83,37.8,1.5862,0,0,-2.261,4.07,,1.8,0 0,71.4021,2023,6,4,244.6009,297.5266,10.2372,0.11331,2.61093,2.31510,11.19,5.0,0.15 1.176,0.0153,0.0029,79,0.0058,Known errors,-1.00,-1,-1,-1 20230604_181151,60063.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:34 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org