IOTA/IOTA-ES occultation update for (535) Montague / TYC 6882-01369-1 event on 2024 Aug 06, 20:10 UT Visible from Summary ------- On 2024 Aug 06 UT, the 77.1566105282334 km diameter asteroid (535) Montague will occult a 10.7 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 2.70 mag to 13.33 mag (the magnitude of the asteroid) for at most 9.680 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 Aug 06, 19:57 - 2024 Aug 06, 20:24 * geocentric midpoint of event [JD]: 2460529.34092721 * magnitude of target star: 10.72 * magnitude drop [mag]: 2.70 * estimated maximum duration [s]: 9.680 * Moon: 5 % sunlit, 126° distance * Sun: 151° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 77 * 1 sigma uncertainty interval [path widths]: +/- 0.11 * 1 sigma uncertainty interval [seconds]: +/- 2.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.015", 0.005", 96°) * approx speed of asteroid's shadow [km/s]: 7.9874 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6882-01369-1 by 535 Montague on 2024 Aug 6 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 - 69 0 0 -12 13 39 20 24 14.6 0 119 28 -11 49 48 -12 37 31 -11 44 39 -12 42 39 .... - 68 0 0 -12 45 35 20 24 14.3 2 118 27 -12 21 46 -13 9 23 -12 16 39 -13 14 31 0.09 - 67 0 0 -13 17 8 20 24 13.7 3 118 26 -12 53 22 -13 40 53 -12 48 15 -13 46 0 0.05 - 66 0 0 -13 48 17 20 24 12.8 4 118 25 -13 24 35 -14 11 59 -13 19 29 -14 17 5 0.03 - 65 0 0 -14 19 2 20 24 11.6 5 118 24 -13 55 24 -14 42 41 -13 50 18 -14 47 46 0.02 - 64 0 0 -14 49 24 20 24 10.2 6 117 23 -14 25 48 -15 12 59 -14 20 43 -15 18 3 0.01 - 63 0 0 -15 19 20 20 24 8.5 7 117 21 -14 55 48 -15 42 51 -14 50 44 -15 47 55 0.01 - 62 0 0 -15 48 51 20 24 6.5 8 117 20 -15 25 23 -16 12 19 -15 20 19 -16 17 22 0.01 - 61 0 0 -16 17 56 20 24 4.2 9 117 19 -15 54 32 -16 41 21 -15 49 29 -16 46 23 0.00 - 60 0 0 -16 46 36 20 24 1.7 10 116 18 -16 23 15 -17 9 57 -16 18 13 -17 14 58 0.00 - 59 0 0 -17 14 49 20 23 58.9 11 116 17 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Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: TYC 6882-01369-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 14 06.5620 DE: -28 01 08.848 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 14 06.5620 DE: -28 01 08.849 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 10.7 * B mag [mag]: 11.4 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (535) Montague asteroid class: approx. diameter [km]: 77 approx. diameter ["]: 0.063 distance from Earth [AU]: 1.68750 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#83 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", 0.005", 96.15° remarks: * orbital elements for (535)Montague : Mean anomaly = 142.9919286224 deg Arg. of pericenter = 67.5888025603 deg Long. of node = 84.7546941531 deg Inclination = 6.7734338963 deg Eccentricity = 0.0259592671 Semimajor axis = 2.5691439948 AU Perihelion dist = 2.5024508996 AU Mag: H = 9.43, G = 0.15 Epoch of elements : MJD 60528.84092755 TDT (2024 Aug 06.8409) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#832023Apr24,9.68,2024,8,6,20.182253,0.002689,-0.011708,-4.395760,-1.001150,0.002543,0.000814,0.000001,0.000000 30.3309,-27.9772,-121.28,16.38,False TYC 6882-01369-1,19.23515612,-28.0191245,11.36,10.72,10.37,0.1,0,,19.26113620,-27.9772321,2.71,2.61,0,0,0 535,Montague,13.33,77.279,1.6875,0,0,-1.728,-5.22,,4.4,0 0,142.7907,2024,8,6,67.5888,84.7547,6.7734,0.02596,2.56914,2.50245,9.43,5.0,0.15 1.108,0.0150,0.0050,96,0.0068,Known errors,1.06,0,-1,-1 20240806_1369-1,60140.23 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 05:38 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org