IOTA/IOTA-ES occultation update for (240) Vanadis / UCAC4 363-196461 event on 2023 Jul 28, 05:54 UT Visible from South America Summary ------- On 2023 Jul 28 UT, the 93.9 km diameter asteroid (240) Vanadis will occult a 11.7 mag star in the constellation Capricornus for observers along a path across South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.48 mag to 12.82 mag (the magnitude of the asteroid) for at most 8.380 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: 100 * date and approx. time of event: 2023 Jul 28, 05:45 - 2023 Jul 28, 06:04 * geocentric midpoint of event [JD]: 2460153.74652013 * magnitude of target star: 11.66 * magnitude drop [mag]: 1.48 * estimated maximum duration [s]: 8.380 * Moon: 73 % sunlit, 71° distance * Sun: 171° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 96 * 1 sigma uncertainty interval [path widths]: +/- 0.02 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.012", 0.001", 74°) * approx speed of asteroid's shadow [km/s]: 11.2085 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 363-196461 by 240 Vanadis on 2023 Jul 28 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 -180 0 0 -31 18 2 6 4 15.1 1 110 -9 -30 50 25 -31 45 42 -30 49 12 -31 46 56 .... -179 0 0 -31 36 49 6 4 14.9 2 110 -10 -31 9 16 -32 4 25 -31 8 2 -32 5 39 0.22 -178 0 0 -31 55 11 6 4 14.6 3 109 -11 -31 27 41 -32 22 44 -31 26 28 -32 23 58 0.21 -177 0 0 -32 13 10 6 4 14.1 3 108 -12 -31 45 43 -32 40 39 -31 44 30 -32 41 52 0.21 -176 0 0 -32 30 43 6 4 13.5 4 108 -13 -32 3 20 -32 58 9 -32 2 7 -32 59 22 0.21 -175 0 0 -32 47 53 6 4 12.7 5 107 -14 -32 20 33 -33 15 15 -32 19 20 -33 16 28 0.21 -174 0 0 -33 4 38 6 4 11.9 6 107 -15 -32 37 22 -33 31 57 -32 36 9 -33 33 10 0.21 -173 0 0 -33 20 59 6 4 10.8 7 106 -15 -32 53 46 -33 48 15 -32 52 34 -33 49 27 0.21 -172 0 0 -33 36 56 6 4 9.7 8 106 -16 -33 9 46 -34 4 8 -33 8 34 -34 5 21 0.21 -171 0 0 -33 52 28 6 4 8.4 9 105 -17 -33 25 22 -34 19 38 -33 24 10 -34 20 50 0.21 -170 0 0 -34 7 37 6 4 7.0 10 105 -18 -33 40 34 -34 34 43 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1 58 22 0.21 - 11 0 0 - 1 1 36 5 46 35.8 25 251 -15 - 0 33 11 - 1 30 4 - 0 31 56 - 1 31 19 0.21 - 10 0 0 - 0 34 50 5 46 31.4 24 251 -14 - 0 6 28 - 1 3 15 - 0 5 13 - 1 4 31 0.21 - 9 0 0 - 0 8 19 5 46 27.1 22 251 -13 0 20 0 - 0 36 41 0 21 15 - 0 37 57 0.21 - 8 0 0 0 17 56 5 46 23.0 21 251 -12 0 46 12 - 0 10 24 0 47 27 - 0 11 39 0.21 - 7 0 0 0 43 55 5 46 19.2 20 251 -11 1 12 8 0 15 38 1 13 23 0 14 23 0.21 - 6 0 0 1 9 37 5 46 15.5 19 251 -10 1 37 48 0 41 23 1 39 2 0 40 8 0.21 - 5 0 0 1 35 1 5 46 12.0 18 251 -9 2 3 9 1 6 50 2 4 24 1 5 35 0.21 - 4 0 0 2 0 8 5 46 8.7 17 251 -8 2 28 13 1 32 0 2 29 27 1 30 45 0.21 - 3 0 0 2 24 56 5 46 5.6 16 251 -7 2 52 58 1 56 51 2 54 12 1 55 36 0.21 - 2 0 0 2 49 25 5 46 2.7 15 251 -6 3 17 24 2 21 23 3 18 38 2 20 9 0.21 - 1 0 0 3 13 35 5 46 0.0 14 251 -5 3 41 31 2 45 36 3 42 45 2 44 22 0.22 0 0 0 3 37 24 5 45 57.5 13 251 -4 4 5 17 3 9 29 4 6 31 3 8 14 0.22 1 0 0 4 0 54 5 45 55.2 12 251 -3 4 28 43 3 33 1 4 29 57 3 31 47 0.22 2 0 0 4 24 2 5 45 53.1 11 251 -2 4 51 49 3 56 13 4 53 2 3 54 59 0.22 3 0 0 4 46 49 5 45 51.2 10 251 -1 5 14 32 4 19 3 5 15 46 4 17 49 0.22 4 0 0 5 9 14 5 45 49.5 9 251 1 5 36 55 4 41 31 5 38 8 4 40 17 0.23 5 0 0 5 31 17 5 45 48.0 8 252 2 5 58 54 5 3 37 6 0 8 5 2 24 0.23 6 0 0 5 52 58 5 45 46.7 7 252 3 6 20 32 5 25 21 6 21 45 5 24 8 0.23 7 0 0 6 14 16 5 45 45.6 5 252 4 6 41 46 5 46 42 6 42 59 5 45 29 0.24 8 0 0 6 35 10 5 45 44.7 4 252 5 7 2 38 6 7 40 7 3 51 6 6 27 0.25 9 0 0 6 55 41 5 45 44.0 3 252 6 7 23 5 6 28 14 7 24 18 6 27 1 0.27 10 0 0 7 15 48 5 45 43.5 2 252 7 7 43 9 6 48 24 7 44 22 6 47 11 0.30 11 0 0 7 35 30 5 45 43.1 1 252 8 8 2 49 7 8 10 8 4 1 7 6 57 0.37 12 0 0 7 54 49 5 45 43.0 0 252 9 8 22 4 7 27 31 8 23 16 7 26 18 1.14 Uncertainty in time = +/- 1 secs Prediction of 2023 May 29.0 Data for the target star ------------------------ * name: UCAC4 363-196461 * constellation : Capricornus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 21 05 51.5844 DE: -17 33 06.690 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 21 05 51.5844 DE: -17 33 06.690 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.7 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (240) Vanadis asteroid class: approx. diameter [km]: 94 approx. diameter ["]: 0.077 distance from Earth [AU]: 1.69160 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#68 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): 0.012", 0.001", 73.707° remarks: * orbital elements for (240)Vanadis : Mean anomaly = 278.1868109441 deg Arg. of pericenter = 300.9578361533 deg Long. of node = 115.0629668363 deg Inclination = 2.1057728526 deg Eccentricity = 0.2087923284 Semimajor axis = 2.6626404269 AU Perihelion dist = 2.1067015324 AU Mag: H = 9.20, G = 0.15 Epoch of elements : MJD 60153.24638889 TDT (2023 Jul 28.2464) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#682023Apr24,8.38,2023,7,28,5.916483,0.073258,-0.196684,-5.928411,-2.208505,-0.000832,-0.000162,0.000001,0.000000 -77.5950,-17.4569,92.90,19.03,False UCAC4 363-196461,21.09766234,-17.5518585,0.00,11.66,0.00,0.0,0,,21.11995476,-17.4569215,1.48,0.00,0,0,0 240,Vanadis,12.82,93.9,1.6916,0,0,-2.154,-11.48,,5.2,0 0,278.1309,2023,7,28,300.9578,115.0630,2.1058,0.20879,2.66264,2.10670,9.19,5.0,0.15 1.022,0.0120,0.0015,74,0.0017,Known errors,-1.00,-1,-1,-1 20230728_196461,60092.99 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 May 28, 23:41 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org