IOTA/IOTA-ES occultation update for (20) Massalia / UCAC4 337-120691 event on 2023 Oct 20, 09:25 UT Visible from Australia Summary ------- On 2023 Oct 20 UT, the 138.3 km diameter asteroid (20) Massalia will occult a 12.4 mag star in the constellation Sagittarius for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.67 mag to 12.18 mag (the magnitude of the asteroid) for at most 4.780 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: 2023 Oct 20, 09:21 - 2023 Oct 20, 09:29 * geocentric midpoint of event [JD]: 2460237.89283388 * magnitude of target star: 12.36 * magnitude drop [mag]: 0.67 * estimated maximum duration [s]: 4.780 * Moon: 32 % sunlit, 7° distance * Sun: 65° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 140 * 1 sigma uncertainty interval [path widths]: +/- 0.02 * 1 sigma uncertainty interval [seconds]: +/- 0.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.002, +/- 0.001) * 1 sigma uncertainty ellipse (major, minor, PA): (0.002", 0.001", 89°) * approx speed of asteroid's shadow [km/s]: 28.9338 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 337-120691 by 20 Massalia on 2023 Oct 20 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 9 0 0 - 9 35 14 9 22 3.8 1 113 64 -10 16 45 - 8 53 49 -10 18 18 - 8 52 17 .... 10 0 0 -10 0 41 9 22 3.9 2 113 65 -10 42 12 - 9 19 16 -10 43 45 - 9 17 43 0.21 11 0 0 -10 26 7 9 22 4.1 3 113 66 -11 7 39 - 9 44 42 -11 9 12 - 9 43 9 0.20 12 0 0 -10 51 33 9 22 4.3 4 112 67 -11 33 4 -10 10 7 -11 34 37 -10 8 34 0.19 13 0 0 -11 16 56 9 22 4.6 5 112 68 -11 58 28 -10 35 30 -12 0 1 -10 33 58 0.19 14 0 0 -11 42 18 9 22 5.0 6 112 69 -12 23 49 -11 0 52 -12 25 22 -10 59 19 0.19 15 0 0 -12 7 36 9 22 5.5 7 112 70 -12 49 7 -11 26 10 -12 50 40 -11 24 38 0.19 16 0 0 -12 32 50 9 22 6.1 8 112 71 -13 14 21 -11 51 25 -13 15 54 -11 49 53 0.19 17 0 0 -12 58 1 9 22 6.7 9 111 71 -13 39 31 -12 16 36 -13 41 4 -12 15 4 0.19 18 0 0 -13 23 7 9 22 7.4 10 111 72 -14 4 36 -12 41 43 -14 6 9 -12 40 11 0.19 19 0 0 -13 48 7 9 22 8.2 11 111 73 -14 29 35 -13 6 44 -14 31 8 -13 5 12 0.19 20 0 0 -14 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247 -61 -10 20 10 - 8 57 13 -10 21 42 - 8 55 41 0.36 -166 0 0 - 9 13 12 9 29 18.0 0 247 -62 - 9 54 42 - 8 31 47 - 9 56 15 - 8 30 15 1.03 Uncertainty in time = +/- 0 secs Prediction of 2023 Oct 15.9 Data for the target star ------------------------ * name: UCAC4 337-120691 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 03 56.3560 DE: -22 47 41.274 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 03 56.3559 DE: -22 47 41.274 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (20) Massalia asteroid class: ShapeModel approx. diameter [km]: 138 approx. diameter ["]: 0.063 distance from Earth [AU]: 3.02830 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#128 date of fit: 2023 Oct 09 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): 0.002", 0.001", 89.334° remarks: * orbital elements for (20)Massalia : Mean anomaly = 188.6310205141 deg Arg. of pericenter = 257.4693448850 deg Long. of node = 205.9811267968 deg Inclination = 0.7092820509 deg Eccentricity = 0.1435173277 Semimajor axis = 2.4080757995 AU Perihelion dist = 2.0624751958 AU Mag: H = 6.54, G = 0.25 Epoch of elements : MJD 60237.39277778 TDT (2023 Oct 20.3928) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1282023Oct09,4.78,2023,10,20,9.428013,0.000113,-0.172351,16.331017,0.029559,0.005220,0.000080,-0.000001,0.000000 101.3345,-22.7945,34.80,-10.31,False UCAC4 337-120691,18.06565449,-22.7947983,0.00,12.36,0.00,0.0,0,,18.08934566,-22.7944547,0.67,0.00,0,0,0 20,Massalia,12.18,138.300,3.0283,0,0,3.430,0.09,,7.2,0 0,188.5274,2023,10,20,257.4693,205.9811,0.7093,0.14352,2.40808,2.06248,6.61,5.0,0.15 1.019,0.0021,0.0012,89,0.0024,Known errors,-1.00,0,-1,-1 20231020_120691,60232.87 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Oct 15, 20:55 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org