IOTA/IOTA-ES occultation update for (535) Montague / UCAC4 310-248413 event on 2024 Sep 21, 01:44 UT Visible from Summary ------- On 2024 Sep 21 UT, the 77.1332843283657 km diameter asteroid (535) Montague will occult a 11.4 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 2.87 mag to 14.23 mag (the magnitude of the asteroid) for at most 9.230 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 Sep 21, 01:33 - 2024 Sep 21, 01:55 * geocentric midpoint of event [JD]: 2460574.57236391 * magnitude of target star: 11.44 * magnitude drop [mag]: 2.87 * estimated maximum duration [s]: 9.230 * Moon: 87 % sunlit, 115° distance * Sun: 107° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 93 * 1 sigma uncertainty interval [path widths]: +/- 0.11 * 1 sigma uncertainty interval [seconds]: +/- 2.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.011, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.011", 0.004", 98°) * approx speed of asteroid's shadow [km/s]: 8.3741 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 310-248413 by 535 Montague on 2024 Sep 21 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 150 0 0 -38 38 27 1 33 37.7 0 127 51 -39 10 23 -38 6 45 -39 17 14 .. .. .. .... 151 0 0 -39 13 37 1 33 38.0 1 126 50 -39 45 34 -38 41 55 -39 52 25 -38 35 11 0.61 152 0 0 -39 48 33 1 33 38.5 2 125 50 -40 20 31 -39 16 50 -40 27 22 -39 10 6 0.65 153 0 0 -40 23 13 1 33 39.3 3 125 49 -40 55 11 -39 51 30 -41 2 2 -39 44 46 0.66 154 0 0 -40 57 37 1 33 40.3 4 124 49 -41 29 34 -40 25 54 -41 36 26 -40 19 10 0.67 155 0 0 -41 31 42 1 33 41.5 5 123 48 -42 3 39 -41 0 0 -42 10 30 -40 53 16 0.67 156 0 0 -42 5 29 1 33 43.0 6 123 47 -42 37 25 -41 33 48 -42 44 16 -41 27 4 0.68 157 0 0 -42 38 56 1 33 44.8 7 122 47 -43 10 50 -42 7 16 -43 17 41 -42 0 32 0.68 158 0 0 -43 12 2 1 33 46.7 8 121 46 -43 43 54 -42 40 24 -43 50 45 -42 33 40 0.68 159 0 0 -43 44 46 1 33 48.9 9 121 46 -44 16 36 -43 13 9 -44 23 26 -43 6 27 0.68 160 0 0 -44 17 7 1 33 51.2 10 120 45 -44 48 55 -43 45 33 -44 55 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-29 18 45 1 54 4.5 17 247 -58 -29 50 11 -28 47 34 -29 56 56 -28 40 56 0.72 - 15 0 0 -28 41 16 1 54 9.6 16 247 -58 -29 12 36 -28 10 10 -29 19 19 -28 3 34 0.73 - 14 0 0 -28 3 56 1 54 14.4 15 246 -58 -28 35 10 -27 32 56 -28 41 52 -27 26 20 0.73 - 13 0 0 -27 26 46 1 54 18.9 14 246 -58 -27 57 53 -26 55 52 -28 4 34 -26 49 18 0.73 - 12 0 0 -26 49 48 1 54 23.0 13 245 -58 -27 20 49 -26 19 0 -27 27 28 -26 12 27 0.74 - 11 0 0 -26 13 2 1 54 26.9 12 245 -58 -26 43 57 -25 42 22 -26 50 35 -25 35 50 0.74 - 10 0 0 -25 36 32 1 54 30.4 11 244 -58 -26 7 19 -25 5 58 -26 13 56 -24 59 28 0.75 - 9 0 0 -25 0 17 1 54 33.6 10 244 -58 -25 30 57 -24 29 50 -25 37 32 -24 23 21 0.75 - 8 0 0 -24 24 19 1 54 36.5 9 243 -58 -24 54 52 -23 53 59 -25 1 25 -23 47 32 0.76 - 7 0 0 -23 48 39 1 54 39.0 8 243 -58 -24 19 5 -23 18 26 -24 25 37 -23 12 1 0.77 - 6 0 0 -23 13 19 1 54 41.2 7 242 -57 -23 43 38 -22 43 13 -23 50 8 -22 36 49 0.78 - 5 0 0 -22 38 19 1 54 43.1 6 242 -57 -23 8 30 -22 8 21 -23 14 59 -22 1 58 0.80 - 4 0 0 -22 3 41 1 54 44.7 4 242 -57 -22 33 45 -21 33 50 -22 40 11 -21 27 29 0.82 - 3 0 0 -21 29 25 1 54 45.9 3 241 -56 -21 59 21 -20 59 41 -22 5 46 -20 53 22 0.87 - 2 0 0 -20 55 33 1 54 46.8 2 241 -56 -21 25 22 -20 25 57 -21 31 45 -20 19 39 0.95 - 1 0 0 -20 22 5 1 54 47.3 1 240 -55 -20 51 46 -19 52 37 -20 58 8 -19 46 21 1.17 0 0 0 -19 49 3 1 54 47.5 0 240 -55 -20 18 36 .. .. .. -20 24 56 .. .. .. 5.66 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 310-248413 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 11 36.8060 DE: -28 04 48.077 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 11 36.8059 DE: -28 04 48.077 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.4 * B mag [mag]: 12.2 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (535) Montague asteroid class: approx. diameter [km]: 77 approx. diameter ["]: 0.050 distance from Earth [AU]: 2.14700 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): 0.011", 0.004", 97.997° remarks: * orbital elements for (535)Montague : Mean anomaly = 153.8543996577 deg Arg. of pericenter = 67.5519914795 deg Long. of node = 84.7548606556 deg Inclination = 6.7734590707 deg Eccentricity = 0.0259926587 Semimajor axis = 2.5690506554 AU Perihelion dist = 2.5022741985 AU Mag: H = 9.43, G = 0.15 Epoch of elements : MJD 60574.07236396 TDT (2024 Sep 21.0724) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#832023Apr24,9.23,2024,9,21,1.736734,0.105546,-0.540616,4.638813,0.906564,0.005283,0.000836,0.000000,0.000000 -98.1938,-28.0402,152.21,0.57,False UCAC4 310-248413,19.19355723,-28.0800213,12.20,11.44,11.03,0.1,0,,19.21943070,-28.0402171,2.87,2.83,0,0,0 535,Montague,14.23,77.289,2.1470,0,0,1.436,3.72,,4.4,0 0,153.5977,2024,9,20,67.5520,84.7549,6.7735,0.02599,2.56905,2.50227,9.43,5.0,0.15 1.107,0.0113,0.0040,98,0.0053,Known errors,0.81,0,-1,-1 20240921_248413,60140.58 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 13:48 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org