IOTA/IOTA-ES occultation update for (1014) Semphyra / UCAC4 340-160158 event on 2024 Jun 02, 00:21 UT Visible from Summary ------- On 2024 Jun 02 UT, the 17.608502620142 km diameter asteroid (1014) Semphyra will occult a 10.2 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 6.65 mag to 16.87 mag (the magnitude of the asteroid) for at most 1.730 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: 2024 Jun 02, 00:12 - 2024 Jun 02, 00:30 * geocentric midpoint of event [JD]: 2460463.51510571 * magnitude of target star: 10.22 * magnitude drop [mag]: 6.65 * estimated maximum duration [s]: 1.730 * Moon: 24 % sunlit, 95° distance * Sun: 153° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 20 * 1 sigma uncertainty interval [path widths]: +/- 0.14 * 1 sigma uncertainty interval [seconds]: +/- 1.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.010, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.010", 0.001", 84°) * approx speed of asteroid's shadow [km/s]: 11.4401 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 340-160158 by 1014 Semphyra on 2024 Jun 2 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 - 75 0 0 .. .. .... .. .. .. .. .. .. .. .. .. -13 51 53 .. .. .. -13 53 33 ... .. .. - 13 50 34 .... - 74 0 0 -14 10 34 0 30 43.7 1 113 -27 -14 4 34 -14 16 33 -14 2 54 -14 18 14 - 14 5 53 - 14 15 15 .... - 73 0 0 -14 35 13 0 30 43.4 2 112 -28 -14 29 13 -14 41 13 -14 27 33 -14 42 53 - 14 30 32 - 14 39 54 0.26 - 72 0 0 -14 59 50 0 30 42.9 3 112 -29 -14 53 51 -15 5 50 -14 52 10 -15 7 31 - 14 55 9 - 15 4 32 0.25 - 71 0 0 -15 24 25 0 30 42.3 4 112 -31 -15 18 26 -15 30 25 -15 16 45 -15 32 6 - 15 19 44 - 15 29 7 0.25 - 70 0 0 -15 48 57 0 30 41.4 5 112 -32 -15 42 58 -15 54 57 -15 41 17 -15 56 38 - 15 44 16 - 15 53 38 0.25 - 69 0 0 -16 13 25 0 30 40.3 6 111 -33 -16 7 26 -16 19 25 -16 5 45 -16 21 6 - 16 8 44 - 16 18 7 0.25 - 68 0 0 -16 37 50 0 30 39.1 7 111 -34 -16 31 50 -16 43 49 -16 30 10 -16 45 30 - 16 33 8 - 16 42 31 0.25 - 67 0 0 -17 2 9 0 30 37.7 8 111 -35 -16 56 9 -17 8 8 -16 54 29 -17 9 49 - 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Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 14.4 Data for the target star ------------------------ * name: UCAC4 340-160158 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 35 59.6422 DE: -22 09 11.711 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 35 59.6422 DE: -22 09 11.711 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.600,0.400) * V mag [mag]: 10.2 * B mag [mag]: 12.5 * Diameter [mas]: 1.30 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1014) Semphyra asteroid class: approx. diameter [km]: 18 approx. diameter ["]: 0.011 distance from Earth [AU]: 2.27660 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#54 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): 0.010", 0.001", 84.4° remarks: * orbital elements for (1014)Semphyra : Mean anomaly = 128.5858956418 deg Arg. of pericenter = 234.5816877892 deg Long. of node = 251.4635005021 deg Inclination = 2.2654062177 deg Eccentricity = 0.2040340623 Semimajor axis = 2.7998512016 AU Perihelion dist = 2.2285861871 AU Mag: H = 11.98, G = 0.15 Epoch of elements : MJD 60463.01510575 TDT (2024 Jun 02.0151) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#542023Apr24,1.73,2024,6,2,0.362537,-0.000398,-0.256994,-6.457098,0.010724,-0.002574,-0.000258,0.000001,0.000000 22.9617,-22.1337,174.07,22.23,False UCAC4 340-160158,18.59990060,-22.1532530,12.51,10.22,8.98,1.3,4,,18.62467703,-22.1337079,6.65,7.44,0,0,0 1014,Semphyra,16.87,19.755,2.2766,0,0,-1.795,0.04,,1.4,0 0,128.3723,2024,6,1,234.5817,251.4635,2.2654,0.20403,2.79985,2.22859,11.98,5.0,0.15 1.140,0.0104,0.0013,84,0.0017,Known errors,0.99,0,-1,-1 20240602_160158,60139.37 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 08:46 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org