IOTA/IOTA-ES occultation update for (410) Chloris / TYC 5264-00534-1 event on 2024 Jul 03, 07:59 UT Visible from Summary ------- On 2024 Jul 03 UT, the 120.737 km diameter asteroid (410) Chloris will occult a 11.4 mag star in the constellation Cetus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.56 mag to 12.70 mag (the magnitude of the asteroid) for at most 10.330 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: 2024 Jul 03, 07:52 - 2024 Jul 03, 08:06 * geocentric midpoint of event [JD]: 2460494.83296458 * magnitude of target star: 11.44 * magnitude drop [mag]: 1.56 * estimated maximum duration [s]: 10.330 * Moon: 8 % sunlit, 73° distance * Sun: 103° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 156 * 1 sigma uncertainty interval [path widths]: +/- 0.06 * 1 sigma uncertainty interval [seconds]: +/- 1.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.010, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.011", 0.002", 67°) * approx speed of asteroid's shadow [km/s]: 11.6829 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5264-00534-1 by 410 Chloris on 2024 Jul 3 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 -134 0 0 .. .. .... .. .. .. .. .. .. -32 36 6 .. .. .. -32 41 50 .. .. .. .... -133 0 0 -32 4 11 7 52 26.3 1 103 -73 -32 48 6 -31 20 43 -32 53 50 -31 15 8 .... -132 0 0 -32 16 18 7 52 26.5 2 102 -74 -33 0 16 -31 32 48 -33 5 59 -31 27 12 0.68 -131 0 0 -32 28 34 7 52 26.9 3 101 -74 -33 12 34 -31 45 2 -33 18 18 -31 39 26 0.73 -130 0 0 -32 40 59 7 52 27.5 3 101 -75 -33 25 1 -31 57 25 -33 30 45 -31 51 49 0.76 -129 0 0 -32 53 33 7 52 28.2 4 100 -75 -33 37 37 -32 9 57 -33 43 21 -32 4 20 0.77 -128 0 0 -33 6 14 7 52 29.1 5 100 -76 -33 50 21 -32 22 36 -33 56 6 -32 16 59 0.78 -127 0 0 -33 19 4 7 52 30.2 6 99 -76 -34 3 13 -32 35 24 -34 8 58 -32 29 47 0.79 -126 0 0 -33 32 2 7 52 31.4 7 99 -77 -34 16 13 -32 48 20 -34 21 58 -32 42 42 0.79 -125 0 0 -33 45 7 7 52 32.8 8 98 -77 -34 29 20 -33 1 23 -34 35 6 -32 55 45 0.80 -124 0 0 -33 58 19 7 52 34.3 9 98 -77 -34 42 34 -33 14 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54 0.85 37 0 0 -49 26 14 8 5 59.9 17 272 15 -50 9 47 -48 43 8 -50 15 27 -48 37 35 0.85 38 0 0 -49 17 47 8 6 2.2 16 271 15 -50 1 22 -48 34 39 -50 7 3 -48 29 5 0.85 39 0 0 -49 9 9 8 6 4.5 15 271 16 -49 52 47 -48 25 59 -49 58 28 -48 20 26 0.85 40 0 0 -49 0 22 8 6 6.6 15 270 16 -49 44 2 -48 17 9 -49 49 43 -48 11 35 0.85 41 0 0 -48 51 24 8 6 8.7 14 269 16 -49 35 6 -48 8 9 -49 40 48 -48 2 35 0.85 42 0 0 -48 42 16 8 6 10.7 13 268 17 -49 26 0 -47 58 59 -49 31 42 -47 53 24 0.85 43 0 0 -48 32 58 8 6 12.6 13 267 17 -49 16 45 -47 49 38 -49 22 27 -47 44 4 0.86 44 0 0 -48 23 30 8 6 14.4 12 267 18 -49 7 19 -47 40 8 -49 13 1 -47 34 33 0.86 45 0 0 -48 13 52 8 6 16.1 11 266 18 -48 57 43 -47 30 28 -49 3 26 -47 24 53 0.86 46 0 0 -48 4 4 8 6 17.7 11 265 18 -48 47 58 -47 20 38 -48 53 41 -47 15 3 0.86 47 0 0 -47 54 7 8 6 19.2 10 264 18 -48 38 3 -47 10 39 -48 43 46 -47 5 3 0.87 48 0 0 -47 44 0 8 6 20.6 9 264 19 -48 27 58 -47 0 30 -48 33 42 -46 54 54 0.87 49 0 0 -47 33 44 8 6 22.0 8 263 19 -48 17 44 -46 50 11 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Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: TYC 5264-00534-1 * constellation : Cetus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 00 10 30.8602 DE: -11 12 19.584 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 00 10 30.8603 DE: -11 12 19.583 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.4 * B mag [mag]: 11.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (410) Chloris asteroid class: approx. diameter [km]: 121 approx. diameter ["]: 0.090 distance from Earth [AU]: 1.85680 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#73 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): 0.011", 0.002", 67.287° remarks: * orbital elements for (410)Chloris : Mean anomaly = 40.5406547940 deg Arg. of pericenter = 172.7605227978 deg Long. of node = 96.9175116521 deg Inclination = 10.9634769419 deg Eccentricity = 0.2407636636 Semimajor axis = 2.7242772811 AU Perihelion dist = 2.0683703022 AU Mag: H = 8.37, G = 0.15 Epoch of elements : MJD 60494.33296429 TDT (2024 Jul 03.3330) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#732023Apr24,10.33,2024,7,3,7.991150,-0.076422,-0.628208,6.546083,-0.794890,-0.004867,-0.001892,0.000000,0.000000 -38.7647,-11.0679,61.22,22.91,False TYC 5264-00534-1,0.17523892,-11.2054401,11.77,11.44,11.26,0.0,0,,0.19611625,-11.0678792,1.55,1.35,0,0,0 410,Chloris,12.70,120.737,1.8568,0,0,2.106,-3.76,,6.8,0 0,40.4677,2024,7,3,172.7605,96.9175,10.9635,0.24076,2.72428,2.06837,8.37,5.0,0.15 1.065,0.0110,0.0023,67,0.0058,Known errors,1.51,0,-1,-1 20240703_0534-1,60140.18 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 04:21 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org