IOTA/IOTA-ES occultation update for (535) Montague / TYC 0862-00080-1 event on 2023 Apr 15, 05:31 UT Visible from South America Summary ------- On 2023 Apr 15 UT, the 77.2 km diameter asteroid (535) Montague will occult a 9.7 mag star in the constellation Leo 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 3.71 mag to 13.33 mag (the magnitude of the asteroid) for at most 12.400 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: 2023 Apr 15, 05:14 - 2023 Apr 15, 05:48 * geocentric midpoint of event [JD]: 2460049.73028671 * magnitude of target star: 9.66 * magnitude drop [mag]: 3.71 * estimated maximum duration [s]: 12.400 * Moon: 29 % sunlit, 151° distance * Sun: 142° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 80 * 1 sigma uncertainty interval [path widths]: +/- 0.12 * 1 sigma uncertainty interval [seconds]: +/- 2.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.008) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.005", 115°) * approx speed of asteroid's shadow [km/s]: 6.2245 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0862-00080-1 by 535 Montague on 2023 Apr 15 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 158 0 0 -16 15 26 5 48 1.5 0 75 21 -15 52 49 -16 38 5 -15 47 12 -16 43 44 .... 159 0 0 -16 0 21 5 48 1.3 1 75 20 -15 37 45 -16 23 0 -15 32 7 -16 28 39 0.12 160 0 0 -15 45 17 5 48 0.7 2 75 19 -15 22 41 -16 7 56 -15 17 4 -16 13 35 0.20 161 0 0 -15 30 14 5 47 59.8 3 74 18 -15 7 38 -15 52 53 -15 2 1 -15 58 32 0.23 162 0 0 -15 15 13 5 47 58.6 4 74 17 -14 52 37 -15 37 51 -14 47 0 -15 43 30 0.25 163 0 0 -15 0 13 5 47 57.0 5 74 16 -14 37 38 -15 22 51 -14 32 1 -15 28 30 0.26 164 0 0 -14 45 15 5 47 55.2 6 74 16 -14 22 41 -15 7 53 -14 17 3 -15 13 32 0.27 165 0 0 -14 30 20 5 47 53.0 7 73 15 -14 7 46 -14 52 57 -14 2 8 -14 58 36 0.27 166 0 0 -14 15 28 5 47 50.5 8 73 14 -13 52 53 -14 38 5 -13 47 16 -14 43 43 0.28 167 0 0 -14 0 38 5 47 47.7 9 73 13 -13 38 4 -14 23 14 -13 32 27 -14 28 53 0.28 168 0 0 -13 45 51 5 47 44.6 10 73 12 -13 23 18 -14 8 27 -13 17 41 -14 14 6 0.28 169 0 0 -13 31 8 5 47 41.1 11 72 11 -13 8 35 -13 53 44 -13 2 59 -13 59 22 0.28 170 0 0 -13 16 29 5 47 37.4 12 72 10 -12 53 57 -13 39 4 -12 48 20 -13 44 42 0.29 171 0 0 -13 1 54 5 47 33.4 13 72 9 -12 39 22 -13 24 29 -12 33 46 -13 30 7 0.29 172 0 0 -12 47 23 5 47 29.0 14 72 9 -12 24 52 -13 9 57 -12 19 16 -13 15 35 0.29 173 0 0 -12 32 57 5 47 24.4 15 72 8 -12 10 26 -12 55 31 -12 4 50 -13 1 9 0.29 174 0 0 -12 18 36 5 47 19.4 16 71 7 -11 56 6 -12 41 9 -11 50 30 -12 46 47 0.29 175 0 0 -12 4 20 5 47 14.2 17 71 6 -11 41 50 -12 26 53 -11 36 14 -12 32 30 0.29 176 0 0 -11 50 10 5 47 8.6 18 71 5 -11 27 40 -12 12 41 -11 22 5 -12 18 19 0.29 177 0 0 -11 36 5 5 47 2.8 19 71 4 -11 13 36 -11 58 36 -11 8 1 -12 4 13 0.29 178 0 0 -11 22 6 5 46 56.6 20 70 3 -10 59 38 -11 44 36 -10 54 3 -11 50 13 0.29 179 0 0 -11 8 13 5 46 50.2 21 70 2 -10 45 46 -11 30 43 -10 40 11 -11 36 20 0.29 -180 0 0 -10 54 27 5 46 43.5 22 70 1 -10 32 0 -11 16 56 -10 26 25 -11 22 33 0.29 -179 0 0 -10 40 47 5 46 36.5 23 70 1 -10 18 22 -11 3 16 -10 12 47 -11 8 52 0.29 -178 0 0 -10 27 15 5 46 29.3 24 69 0 -10 4 50 -10 49 43 - 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Uncertainty in time = +/- 3 secs Prediction of 2023 Feb 15.9 Data for the target star ------------------------ * name: TYC 0862-00080-1 * constellation : Leo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 11 33 15.0860 DE: +14 07 25.004 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 11 33 15.0860 DE: +14 07 25.004 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 9.7 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (535) Montague asteroid class: approx. diameter [km]: 77 approx. diameter ["]: 0.065 distance from Earth [AU]: 1.64180 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#82 date of fit: 2023 Feb 07 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): 0.016", 0.005", 115.424° remarks: * orbital elements for (535)Montague : Mean anomaly = 27.7992011304 deg Arg. of pericenter = 68.0333520910 deg Long. of node = 84.7599201147 deg Inclination = 6.7726240534 deg Eccentricity = 0.0256971650 Semimajor axis = 2.5696230126 AU Perihelion dist = 2.5035909861 AU Mag: H = 9.44, G = 0.15 Epoch of elements : MJD 60049.23027778 TDT (2023 Apr 15.2303) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#822023Feb07,12.40,2023,4,15,5.526881,0.003490,-0.276206,-3.513036,-0.043313,0.002708,-0.002072,0.000001,0.000000 -112.4088,13.9949,97.14,9.68,False TYC 0862-00080-1,11.55419057,14.1236120,0.00,9.66,0.00,0.0,0,,11.57449433,13.9948745,3.71,0.00,0,0,0 535,Montague,13.33,77.2,1.6418,0,0,-1.292,-0.24,,4.4,0 0,27.7441,2023,4,15,68.0334,84.7599,6.7726,0.02570,2.56962,2.50359,9.45,5.0,0.15 1.125,0.0157,0.0047,115,0.0081,Known errors,-1.00,-1,-1,-1 20230415_0080-1,59990.88 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Feb 15, 21:00 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org