IOTA/IOTA-ES occultation update for (417) Suevia / UCAC4 386-107495 event on 2023 Jul 08, 11:05 UT Visible from New Zealand, Australia Summary ------- On 2023 Jul 08 UT, the 48.1 km diameter asteroid (417) Suevia will occult a 12.0 mag star in the constellation Scutum for observers along a path across New Zealand, Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.72 mag to 13.47 mag (the magnitude of the asteroid) for at most 4.300 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 Jul 08, 10:57 - 2023 Jul 08, 11:14 * geocentric midpoint of event [JD]: 2460133.96241396 * magnitude of target star: 12.00 * magnitude drop [mag]: 1.72 * estimated maximum duration [s]: 4.300 * Moon: 69 % sunlit, 76° distance * Sun: 168° distance * rough path description: New Zealand, Australia The occultation path -------------------- * approximate projected width [km]: 54 * 1 sigma uncertainty interval [path widths]: +/- 0.15 * 1 sigma uncertainty interval [seconds]: +/- 2.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.020, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.020", 0.005", 80°) * approx speed of asteroid's shadow [km/s]: 11.1864 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 386-107495 by 417 Suevia on 2023 Jul 8 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 87 0 0 -32 39 26 11 14 16.9 1 105 0 -32 24 16 -32 54 38 -32 19 49 -32 59 7 .... 88 0 0 -32 53 8 11 14 16.8 1 104 -1 -32 37 59 -33 8 20 -32 33 32 -33 12 49 0.43 89 0 0 -33 6 43 11 14 16.4 2 104 -1 -32 51 34 -33 21 54 -32 47 7 -33 26 23 0.46 90 0 0 -33 20 10 11 14 16.0 3 103 -2 -33 5 1 -33 35 21 -33 0 35 -33 39 49 0.48 91 0 0 -33 33 30 11 14 15.4 4 103 -3 -33 18 21 -33 48 40 -33 13 54 -33 53 8 0.49 92 0 0 -33 46 41 11 14 14.6 5 102 -4 -33 31 33 -34 1 51 -33 27 6 -34 6 19 0.49 93 0 0 -33 59 44 11 14 13.7 6 102 -5 -33 44 37 -34 14 54 -33 40 10 -34 19 22 0.49 94 0 0 -34 12 39 11 14 12.7 7 101 -6 -33 57 32 -34 27 48 -33 53 6 -34 32 16 0.50 95 0 0 -34 25 26 11 14 11.5 7 100 -6 -34 10 19 -34 40 34 -34 5 53 -34 45 2 0.50 96 0 0 -34 38 3 11 14 10.2 8 100 -7 -34 22 57 -34 53 12 -34 18 31 -34 57 39 0.50 97 0 0 -34 50 32 11 14 8.7 9 99 -8 -34 35 27 -35 5 40 -34 31 1 -35 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Uncertainty in time = +/- 2 secs Prediction of 2023 May 14.2 Data for the target star ------------------------ * name: UCAC4 386-107495 * constellation : Scutum * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 36 07.3778 DE: -12 49 02.020 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 36 07.3778 DE: -12 49 02.020 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 12.0 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (417) Suevia asteroid class: approx. diameter [km]: 48 approx. diameter ["]: 0.037 distance from Earth [AU]: 1.76970 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#69 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): 0.020", 0.005", 80.373° remarks: * orbital elements for (417)Suevia : Mean anomaly = 78.0767209587 deg Arg. of pericenter = 348.4088896306 deg Long. of node = 199.4858491420 deg Inclination = 6.6478622917 deg Eccentricity = 0.1353822185 Semimajor axis = 2.7990369472 AU Perihelion dist = 2.4200971156 AU Mag: H = 9.61, G = 0.15 Epoch of elements : MJD 60133.46222222 TDT (2023 Jul 08.4622) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#692023Apr24,4.30,2023,7,8,11.097935,0.045151,-0.461956,-6.284000,-0.614144,0.000682,-0.000941,0.000001,0.000000 -173.2509,-12.7980,14.81,22.47,False UCAC4 386-107495,18.60204939,-12.8172279,0.00,12.00,0.00,0.0,0,,18.62433451,-12.7980296,1.72,0.00,0,0,0 417,Suevia,13.47,48.1,1.7697,0,0,-2.134,-3.05,,2.4,0 0,77.9794,2023,7,8,348.4089,199.4858,6.6479,0.13538,2.79904,2.42010,9.62,5.0,0.15 1.147,0.0203,0.0053,80,0.0055,Known errors,-1.00,-1,-1,-1 20230708_107495,60078.17 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 May 14, 04:00 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org