IOTA/IOTA-ES occultation update for (550) Senta / UCAC4 391-109548 event on 2024 Sep 01, 22:15 UT Visible from Summary ------- On 2024 Sep 01 UT, the 41.793776294591 km diameter asteroid (550) Senta will occult a 10.9 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 1.79 mag to 12.43 mag (the magnitude of the asteroid) for at most 12.910 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 Sep 01, 21:42 - 2024 Sep 01, 22:48 * geocentric midpoint of event [JD]: 2460555.42739813 * magnitude of target star: 10.87 * magnitude drop [mag]: 1.79 * estimated maximum duration [s]: 12.910 * Moon: 1 % sunlit, 138° distance * Sun: 127° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 42 * 1 sigma uncertainty interval [path widths]: +/- 0.06 * 1 sigma uncertainty interval [seconds]: +/- 6.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.022, +/- 0.008) * 1 sigma uncertainty ellipse (major, minor, PA): (0.024", 0.002", 71°) * approx speed of asteroid's shadow [km/s]: 3.2445 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 391-109548 by 550 Senta on 2024 Sep 1 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 -111 0 0 - 8 10 44 21 42 53.5 1 102 52 - 8 22 23 - 7 59 4 - 8 23 42 - 7 57 45 .... -110 0 0 - 8 23 4 21 42 54.2 2 102 51 - 8 34 43 - 8 11 25 - 8 36 2 - 8 10 6 -0.02 -109 0 0 - 8 35 8 21 42 55.5 3 102 50 - 8 46 46 - 8 23 30 - 8 48 5 - 8 22 11 -0.05 -108 0 0 - 8 46 56 21 42 57.5 4 101 49 - 8 58 34 - 8 35 19 - 8 59 53 - 8 34 0 -0.06 -107 0 0 - 8 58 28 21 43 0.1 5 101 48 - 9 10 4 - 8 46 50 - 9 11 23 - 8 45 32 -0.07 -106 0 0 - 9 9 42 21 43 3.3 6 101 47 - 9 21 18 - 8 58 5 - 9 22 37 - 8 56 46 -0.07 -105 0 0 - 9 20 39 21 43 7.1 7 101 46 - 9 32 15 - 9 9 3 - 9 33 33 - 9 7 44 -0.08 -104 0 0 - 9 31 18 21 43 11.6 8 101 45 - 9 42 54 - 9 19 43 - 9 44 12 - 9 18 24 -0.08 -103 0 0 - 9 41 40 21 43 16.7 9 101 44 - 9 53 15 - 9 30 5 - 9 54 33 - 9 28 47 -0.08 -102 0 0 - 9 51 44 21 43 22.5 10 100 43 -10 3 18 - 9 40 10 -10 4 37 - 9 38 51 -0.09 -101 0 0 -10 1 29 21 43 28.8 11 100 42 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49 - 8 27 42 - 8 1 29 -0.13 - 40 0 0 - 8 0 1 22 8 36.9 76 107 -23 - 8 11 49 - 7 48 13 - 8 13 9 - 7 46 53 -0.13 - 39 0 0 - 7 45 2 22 9 16.7 77 110 -24 - 7 56 51 - 7 33 13 - 7 58 11 - 7 31 53 -0.13 - 38 0 0 - 7 29 39 22 9 56.7 78 112 -25 - 7 41 29 - 7 17 49 - 7 42 49 - 7 16 28 -0.13 - 37 0 0 - 7 13 52 22 10 36.9 79 116 -26 - 7 25 42 - 7 2 0 - 7 27 3 - 7 0 40 -0.13 - 36 0 0 - 6 57 41 22 11 17.4 80 120 -27 - 7 9 33 - 6 45 48 - 7 10 53 - 6 44 28 -0.13 - 35 0 0 - 6 41 6 22 11 58.1 81 125 -29 - 6 52 59 - 6 29 13 - 6 54 20 - 6 27 52 -0.13 - 34 0 0 - 6 24 9 22 12 38.9 82 131 -30 - 6 36 3 - 6 12 14 - 6 37 24 - 6 10 53 -0.12 - 33 0 0 - 6 6 49 22 13 20.0 82 137 -31 - 6 18 44 - 5 54 53 - 6 20 5 - 5 53 32 -0.12 - 32 0 0 - 5 49 7 22 14 1.2 83 146 -32 - 6 1 3 - 5 37 10 - 6 2 25 - 5 35 49 -0.12 - 31 0 0 - 5 31 3 22 14 42.5 83 155 -33 - 5 43 1 - 5 19 6 - 5 44 22 - 5 17 44 -0.12 - 30 0 0 - 5 12 39 22 15 23.9 83 164 -34 - 5 24 37 - 5 0 40 - 5 25 58 - 4 59 18 -0.12 - 29 0 0 - 4 53 53 22 16 5.4 83 174 -35 - 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-0.08 23 0 0 14 24 11 22 44 28.4 27 249 -67 14 12 8 14 36 14 14 10 46 14 37 36 -0.08 24 0 0 14 44 12 22 44 44.7 25 249 -67 14 32 10 14 56 15 14 30 49 14 57 37 -0.08 25 0 0 15 3 58 22 45 0.4 24 249 -66 14 51 57 15 16 0 14 50 36 15 17 22 -0.08 26 0 0 15 23 29 22 45 15.4 23 250 -66 15 11 29 15 35 30 15 10 7 15 36 51 -0.08 27 0 0 15 42 44 22 45 29.6 22 250 -65 15 30 45 15 54 44 15 29 23 15 56 5 -0.08 28 0 0 16 1 43 22 45 43.1 21 250 -64 15 49 44 16 13 42 15 48 23 16 15 3 -0.08 29 0 0 16 20 26 22 45 56.0 20 251 -64 16 8 28 16 32 24 16 7 7 16 33 45 -0.08 30 0 0 16 38 52 22 46 8.1 19 251 -63 16 26 55 16 50 49 16 25 34 16 52 10 -0.08 31 0 0 16 57 2 22 46 19.5 18 251 -62 16 45 6 17 8 58 16 43 45 17 10 19 -0.08 32 0 0 17 14 54 22 46 30.3 17 251 -62 17 2 59 17 26 50 17 1 38 17 28 11 -0.08 33 0 0 17 32 30 22 46 40.4 16 252 -61 17 20 36 17 44 25 17 19 15 17 45 46 -0.08 34 0 0 17 49 49 22 46 49.8 15 252 -60 17 37 55 18 1 42 17 36 35 18 3 3 -0.08 35 0 0 18 6 50 22 46 58.6 14 252 -59 17 54 57 18 18 43 17 53 37 18 20 3 -0.08 36 0 0 18 23 34 22 47 6.7 13 253 -58 18 11 42 18 35 25 18 10 21 18 36 46 -0.08 37 0 0 18 40 0 22 47 14.1 12 253 -58 18 28 9 18 51 51 18 26 49 18 53 11 -0.08 38 0 0 18 56 8 22 47 20.9 11 253 -57 18 44 18 19 7 58 18 42 58 19 9 19 -0.08 39 0 0 19 11 59 22 47 27.1 10 254 -56 19 0 10 19 23 48 18 58 49 19 25 8 -0.08 40 0 0 19 27 31 22 47 32.7 9 254 -55 19 15 43 19 39 20 19 14 23 19 40 40 -0.08 41 0 0 19 42 46 22 47 37.6 8 254 -54 19 30 59 19 54 34 19 29 39 19 55 54 -0.08 42 0 0 19 57 43 22 47 41.9 7 255 -54 19 45 56 20 9 29 19 44 36 20 10 49 -0.08 43 0 0 20 12 21 22 47 45.6 6 255 -53 20 0 36 20 24 7 19 59 16 20 25 27 -0.08 44 0 0 20 26 42 22 47 48.8 5 255 -52 20 14 57 20 38 27 20 13 37 20 39 46 -0.08 45 0 0 20 40 44 22 47 51.3 4 256 -51 20 29 0 20 52 28 20 27 40 20 53 48 -0.08 46 0 0 20 54 28 22 47 53.3 3 256 -50 20 42 45 21 6 11 20 41 25 21 7 31 -0.07 47 0 0 21 7 54 22 47 54.6 2 257 -49 20 56 11 21 19 36 20 54 52 21 20 56 -0.07 48 0 0 21 21 1 22 47 55.5 1 257 -49 21 9 19 21 32 43 21 8 0 21 34 2 -0.05 49 0 0 21 33 50 22 47 55.7 0 257 -48 21 22 9 .. .. .. 21 20 50 .. .. .. 1.67 Uncertainty in time = +/- 7 secs Prediction of 2023 Jul 15.5 Data for the target star ------------------------ * name: UCAC4 391-109548 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 07 49.4819 DE: -11 51 23.626 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 07 49.4819 DE: -11 51 23.626 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 10.9 * B mag [mag]: 11.8 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (550) Senta asteroid class: approx. diameter [km]: 42 approx. diameter ["]: 0.046 distance from Earth [AU]: 1.24400 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#57 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): 0.024", 0.002", 70.667° remarks: * orbital elements for (550)Senta : Mean anomaly = 356.9699038646 deg Arg. of pericenter = 45.1934129331 deg Long. of node = 270.6604389478 deg Inclination = 10.1067053944 deg Eccentricity = 0.2221728315 Semimajor axis = 2.5887595004 AU Perihelion dist = 2.0136074721 AU Mag: H = 9.32, G = 0.15 Epoch of elements : MJD 60554.92739737 TDT (2024 Sep 01.9274) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#572023Apr24,12.91,2024,9,1,22.257555,-0.031196,0.115980,1.768500,0.475315,0.004178,-0.000080,0.000001,0.000000 -28.1248,-11.8174,-153.93,7.83,False UCAC4 391-109548,19.13041166,-11.8565627,11.77,10.87,10.38,0.1,0,,19.15352331,-11.8174473,1.79,1.82,0,0,0 550,Senta,12.43,41.884,1.2440,0,0,0.853,3.36,,1.8,0 0,356.7505,2024,9,1,45.1934,270.6604,10.1067,0.22217,2.58876,2.01361,9.32,5.0,0.15 1.057,0.0237,0.0019,71,0.0026,Known errors,0.91,0,-1,-1 20240901_109548,60140.54 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 12:51 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org