IOTA/IOTA-ES occultation update for (535) Montague / UCAC4 338-124198 event on 2024 Feb 09, 21:03 UT Visible from Summary ------- On 2024 Feb 09 UT, the 77.253 km diameter asteroid (535) Montague will occult a 12.0 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 2.95 mag to 14.86 mag (the magnitude of the asteroid) for at most 2.040 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 Feb 09, 21:00 - 2024 Feb 09, 21:06 * geocentric midpoint of event [JD]: 2460350.37728534 * magnitude of target star: 11.98 * magnitude drop [mag]: 2.95 * estimated maximum duration [s]: 2.040 * Moon: 0 % sunlit, 47° distance * Sun: 48° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 80 * 1 sigma uncertainty interval [path widths]: +/- 0.07 * 1 sigma uncertainty interval [seconds]: +/- 0.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.007, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.007", 0.002", 99°) * approx speed of asteroid's shadow [km/s]: 37.8325 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 338-124198 by 535 Montague on 2024 Feb 9 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 83 0 0 -12 2 52 21 0 34.4 0 113 -47 -12 26 28 .. .. .. -12 30 0 .. .. .. .... 84 0 0 -12 28 1 21 0 34.4 1 113 -46 -12 51 39 -12 4 27 -12 55 11 -12 0 56 0.27 85 0 0 -12 53 14 21 0 34.5 2 113 -45 -13 16 52 -12 29 39 -13 20 24 -12 26 7 0.27 86 0 0 -13 18 28 21 0 34.6 3 112 -44 -13 42 7 -12 54 53 -13 45 39 -12 51 21 0.27 87 0 0 -13 43 44 21 0 34.9 4 112 -42 -14 7 23 -13 20 8 -14 10 56 -13 16 36 0.27 88 0 0 -14 9 1 21 0 35.1 5 112 -41 -14 32 40 -13 45 24 -14 36 13 -13 41 53 0.27 89 0 0 -14 34 18 21 0 35.5 6 112 -40 -14 57 57 -14 10 41 -15 1 30 -14 7 9 0.27 90 0 0 -14 59 34 21 0 35.9 7 111 -39 -15 23 14 -14 35 57 -15 26 47 -14 32 25 0.27 91 0 0 -15 24 49 21 0 36.3 9 111 -38 -15 48 29 -15 1 12 -15 52 2 -14 57 40 0.27 92 0 0 -15 50 2 21 0 36.8 10 111 -37 -16 13 43 -15 26 25 -16 17 15 -15 22 53 0.27 93 0 0 -16 15 13 21 0 37.4 11 111 -36 -16 38 54 -15 51 36 -16 42 26 -15 48 4 0.27 94 0 0 -16 40 21 21 0 38.0 12 110 -35 -17 4 2 -16 16 44 -17 7 34 -16 13 12 0.27 95 0 0 -17 5 26 21 0 38.7 13 110 -34 -17 29 6 -16 41 48 -17 32 38 -16 38 17 0.27 96 0 0 -17 30 26 21 0 39.4 14 110 -33 -17 54 6 -17 6 48 -17 57 38 -17 3 17 0.27 97 0 0 -17 55 21 21 0 40.2 15 109 -32 -18 19 0 -17 31 44 -18 22 33 -17 28 12 0.27 98 0 0 -18 20 10 21 0 41.0 16 109 -31 -18 43 50 -17 56 34 -18 47 22 -17 53 2 0.27 99 0 0 -18 44 54 21 0 41.9 17 109 -30 -19 8 33 -18 21 18 -19 12 5 -18 17 46 0.27 100 0 0 -19 9 31 21 0 42.9 18 108 -29 -19 33 9 -18 45 55 -19 36 41 -18 42 24 0.27 101 0 0 -19 34 0 21 0 43.9 19 108 -28 -19 57 38 -19 10 25 -20 1 10 -19 6 54 0.27 102 0 0 -19 58 22 21 0 44.9 20 108 -27 -20 21 58 -19 34 48 -20 25 31 -19 31 16 0.27 103 0 0 -20 22 35 21 0 46.0 21 107 -26 -20 46 11 -19 59 2 -20 49 43 -19 55 30 0.27 104 0 0 -20 46 39 21 0 47.1 22 107 -25 -21 10 14 -20 23 7 -21 13 46 -20 19 36 0.27 105 0 0 -21 10 34 21 0 48.3 23 106 -24 -21 34 8 -20 47 2 -21 37 40 -20 43 31 0.27 106 0 0 -21 34 18 21 0 49.6 24 106 -23 -21 57 52 -21 10 48 -22 1 23 -21 7 17 0.27 107 0 0 -21 57 52 21 0 50.8 25 106 -22 -22 21 25 -21 34 23 -22 24 56 -21 30 53 0.27 108 0 0 -22 21 15 21 0 52.2 26 105 -21 -22 44 46 -21 57 47 -22 48 18 -21 54 17 0.27 109 0 0 -22 44 27 21 0 53.5 27 105 -20 -23 7 57 -22 21 0 -23 11 28 -22 17 30 0.27 110 0 0 -23 7 26 21 0 54.9 28 104 -19 -23 30 55 -22 44 1 -23 34 25 -22 40 31 0.27 111 0 0 -23 30 13 21 0 56.4 29 104 -18 -23 53 40 -23 6 49 -23 57 11 -23 3 20 0.27 112 0 0 -23 52 47 21 0 57.9 30 103 -17 -24 16 13 -23 29 25 -24 19 43 -23 25 55 0.27 113 0 0 -24 15 8 21 0 59.4 31 103 -16 -24 38 32 -23 51 47 -24 42 2 -23 48 17 0.27 114 0 0 -24 37 15 21 1 1.0 32 102 -15 -25 0 37 -24 13 55 -25 4 7 -24 10 26 0.27 115 0 0 -24 59 7 21 1 2.6 33 102 -14 -25 22 28 -24 35 49 -25 25 58 -24 32 20 0.27 116 0 0 -25 20 45 21 1 4.2 34 101 -13 -25 44 4 -24 57 29 -25 47 34 -24 54 0 0.27 117 0 0 -25 42 8 21 1 5.9 35 101 -12 -26 5 26 -25 18 54 -26 8 55 -25 15 25 0.27 118 0 0 -26 3 16 21 1 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5 50.1 20 253 63 -23 32 9 -22 45 16 -23 35 40 -22 41 46 0.28 -105 0 0 -22 45 45 21 5 51.1 19 253 62 -23 9 14 -22 22 18 -23 12 45 -22 18 48 0.28 -104 0 0 -22 22 36 21 5 52.1 18 252 62 -22 46 7 -21 59 8 -22 49 38 -21 55 38 0.28 -103 0 0 -21 59 16 21 5 53.0 17 252 61 -22 22 48 -21 35 47 -22 26 19 -21 32 17 0.28 -102 0 0 -21 35 45 21 5 53.9 16 252 60 -21 59 18 -21 12 15 -22 2 50 -21 8 45 0.29 -101 0 0 -21 12 4 21 5 54.7 15 251 59 -21 35 38 -20 48 33 -21 39 9 -20 45 2 0.29 -100 0 0 -20 48 12 21 5 55.4 14 251 58 -21 11 47 -20 24 40 -21 15 19 -20 21 10 0.29 - 99 0 0 -20 24 11 21 5 56.1 13 250 57 -20 47 47 -20 0 39 -20 51 19 -19 57 8 0.29 - 98 0 0 -20 0 2 21 5 56.8 12 250 56 -20 23 38 -19 36 28 -20 27 10 -19 32 57 0.29 - 97 0 0 -19 35 43 21 5 57.4 11 250 55 -19 59 20 -19 12 9 -20 2 53 -19 8 38 0.29 - 96 0 0 -19 11 17 21 5 57.9 9 249 54 -19 34 55 -18 47 42 -19 38 27 -18 44 11 0.30 - 95 0 0 -18 46 44 21 5 58.4 8 249 53 -19 10 22 -18 23 8 -19 13 54 -18 19 37 0.30 - 94 0 0 -18 22 3 21 5 58.8 7 249 53 -18 45 42 -17 58 27 -18 49 15 -17 54 56 0.31 - 93 0 0 -17 57 17 21 5 59.2 6 248 52 -18 20 56 -17 33 41 -18 24 29 -17 30 9 0.31 - 92 0 0 -17 32 25 21 5 59.6 5 248 51 -17 56 5 -17 8 49 -17 59 37 -17 5 17 0.32 - 91 0 0 -17 7 29 21 5 59.8 4 248 50 -17 31 8 -16 43 52 -17 34 41 -16 40 20 0.33 - 90 0 0 -16 42 28 21 6 0.0 3 247 49 -17 6 8 -16 18 50 -17 9 40 -16 15 19 0.36 - 89 0 0 -16 17 23 21 6 0.2 2 247 48 -16 41 3 -15 53 46 -16 44 35 -15 50 14 0.40 - 88 0 0 -15 52 15 21 6 0.3 1 247 47 -16 15 55 -15 28 38 -16 19 28 -15 25 6 0.51 - 87 0 0 -15 27 5 21 6 0.3 0 247 46 -15 50 45 .. .. .. -15 54 17 .. .. .. 2.71 Uncertainty in time = +/- 0 secs Prediction of 2023 Jul 13.2 Data for the target star ------------------------ * name: UCAC4 338-124198 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 08 47.6608 DE: -22 31 05.354 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 08 47.6609 DE: -22 31 05.354 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.0 * B mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (535) Montague asteroid class: approx. diameter [km]: 77 approx. diameter ["]: 0.034 distance from Earth [AU]: 3.13260 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): 0.007", 0.002", 98.593° remarks: * orbital elements for (535)Montague : Mean anomaly = 99.9621021151 deg Arg. of pericenter = 67.7958766735 deg Long. of node = 84.7543833990 deg Inclination = 6.7731998546 deg Eccentricity = 0.0258365198 Semimajor axis = 2.5695128335 AU Perihelion dist = 2.5031255644 AU Mag: H = 9.43, G = 0.15 Epoch of elements : MJD 60349.87728529 TDT (2024 Feb 09.8773) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#832023Apr24,2.04,2024,2,9,21.054848,-0.007505,-0.254833,21.342827,-0.682039,-0.004388,-0.000013,-0.000001,0.000000 177.2784,-22.5152,-132.28,-14.62,False UCAC4 338-124198,18.14657239,-22.5181539,12.36,11.98,11.77,0.0,0,,18.17051758,-22.5151659,2.95,2.72,0,0,0 535,Montague,14.86,77.253,3.1326,0,0,4.325,-1.91,,4.4,0 0,99.7522,2024,2,9,67.7959,84.7544,6.7732,0.02584,2.56951,2.50313,9.43,5.0,0.15 1.075,0.0073,0.0024,99,0.0025,Known errors,0.80,0,-1,-1 20240209_124198,60138.16 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 13, 03:53 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org