IOTA/IOTA-ES occultation update for (1867) Deiphobus / UCAC4 541-144858 event on 2023 Sep 18, 18:29 UT Visible from Asia, Africa Summary ------- On 2023 Sep 18 UT, the 122.8 km diameter asteroid (1867) Deiphobus will occult a 12.4 mag star in the constellation Pegasus for observers along a path across Asia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.19 mag to 15.52 mag (the magnitude of the asteroid) for at most 8.060 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 Sep 18, 18:22 - 2023 Sep 18, 18:36 * geocentric midpoint of event [JD]: 2460206.27050829 * magnitude of target star: 12.39 * magnitude drop [mag]: 3.19 * estimated maximum duration [s]: 8.060 * Moon: 12 % sunlit, 119° distance * Sun: 147° distance * rough path description: Asia, Africa The occultation path -------------------- * approximate projected width [km]: 127 * 1 sigma uncertainty interval [path widths]: +/- 0.10 * 1 sigma uncertainty interval [seconds]: +/- 3.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.012) * 1 sigma uncertainty ellipse (major, minor, PA): (0.019", 0.001", 52°) * approx speed of asteroid's shadow [km/s]: 15.2396 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 541-144858 by 1867 Deiphobus on 2023 Sep 18 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 - 33 0 0 -11 32 5 18 36 18.2 0 71 22 -10 55 54 -12 8 11 -10 48 33 -12 15 29 .... - 32 0 0 -11 11 44 18 36 18.1 1 71 21 -10 35 27 -11 47 56 -10 28 5 -11 55 15 -0.23 - 31 0 0 -10 50 51 18 36 17.8 2 71 20 -10 14 29 -11 27 8 -10 7 5 -11 34 29 -0.23 - 30 0 0 -10 29 27 18 36 17.4 3 71 19 - 9 52 58 -11 5 50 - 9 45 34 -11 13 11 -0.23 - 29 0 0 -10 7 30 18 36 16.9 4 71 18 - 9 30 55 -10 43 59 - 9 23 30 -10 51 22 -0.24 - 28 0 0 - 9 45 2 18 36 16.2 6 70 17 - 9 8 21 -10 21 37 - 9 0 55 -10 29 1 -0.24 - 27 0 0 - 9 22 3 18 36 15.4 7 70 16 - 8 45 16 - 9 58 44 - 8 37 48 -10 6 9 -0.24 - 26 0 0 - 8 58 33 18 36 14.4 8 70 15 - 8 21 40 - 9 35 20 - 8 14 10 - 9 42 46 -0.24 - 25 0 0 - 8 34 32 18 36 13.2 9 70 14 - 7 57 32 - 9 11 25 - 7 50 2 - 9 18 53 -0.24 - 24 0 0 - 8 10 0 18 36 12.0 10 70 13 - 7 32 55 - 8 47 0 - 7 25 23 - 8 54 29 -0.24 - 23 0 0 - 7 44 59 18 36 10.5 11 70 12 - 7 7 47 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0 5 35 46 18 34 39.3 39 71 -13 6 15 28 4 56 13 6 23 31 4 48 12 -0.24 4 0 0 6 10 55 18 34 33.9 41 71 -14 6 50 40 5 31 17 6 58 45 5 23 16 -0.24 5 0 0 6 46 15 18 34 28.3 42 72 -15 7 26 4 6 6 33 7 34 9 5 58 31 -0.24 6 0 0 7 21 45 18 34 22.5 43 72 -16 8 1 38 6 42 0 8 9 44 6 33 57 -0.24 7 0 0 7 57 24 18 34 16.7 44 72 -17 8 37 21 7 17 35 8 45 27 7 9 32 -0.24 8 0 0 8 33 12 18 34 10.7 45 73 -18 9 13 11 7 53 20 9 21 19 7 45 16 -0.24 9 0 0 9 9 6 18 34 4.7 46 73 -18 9 49 9 8 29 11 9 57 17 8 21 6 -0.24 10 0 0 9 45 6 18 33 58.5 47 74 -19 10 25 12 9 5 9 10 33 21 8 57 3 -0.24 11 0 0 10 21 12 18 33 52.2 48 74 -20 11 1 20 9 41 11 11 9 29 9 33 6 -0.24 12 0 0 10 57 21 18 33 45.8 49 75 -21 11 37 31 10 17 18 11 45 41 10 9 12 -0.24 13 0 0 11 33 33 18 33 39.3 50 75 -22 12 13 45 10 53 28 12 21 56 10 45 21 -0.24 14 0 0 12 9 46 18 33 32.7 51 76 -23 12 50 1 11 29 39 12 58 11 11 21 32 -0.24 15 0 0 12 46 0 18 33 26.1 52 77 -24 13 26 16 12 5 52 13 34 27 11 57 44 -0.24 16 0 0 13 22 13 18 33 19.3 54 77 -25 14 2 31 12 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Uncertainty in time = +/- 4 secs Prediction of 2023 Aug 27.0 Data for the target star ------------------------ * name: UCAC4 541-144858 * constellation : Pegasus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 21 56 14.4170 DE: +18 07 04.055 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 21 56 14.4170 DE: +18 07 04.055 * 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: (1867) Deiphobus asteroid class: approx. diameter [km]: 123 approx. diameter ["]: 0.041 distance from Earth [AU]: 4.13600 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#94 date of fit: 2023 Aug 22 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): 0.019", 0.001", 51.637° remarks: * orbital elements for (1867)Deiphobus : Mean anomaly = 55.5420811209 deg Arg. of pericenter = 1.0730300112 deg Long. of node = 283.7002701219 deg Inclination = 26.8980051206 deg Eccentricity = 0.0460024470 Semimajor axis = 5.1351536650 AU Perihelion dist = 4.8989240306 AU Mag: H = 8.44, G = 0.15 Epoch of elements : MJD 60205.77013889 TDT (2023 Sep 18.7701) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#942023Aug22,8.06,2023,9,18,18.492199,-0.105577,0.215895,-7.725727,-3.781771,0.002678,-0.001823,0.000001,0.000001 54.5439,18.2321,-98.84,1.75,False UCAC4 541-144858,21.93733806,18.1177930,0.00,12.39,0.00,0.0,0,,21.95627105,18.2320758,3.18,0.00,0,0,0 1867,Deiphobus,15.52,122.800,4.1360,0,0,-1.153,-8.04,,6.6,0 0,55.4769,2023,9,18,1.0730,283.7003,26.8980,0.04600,5.13515,4.89892,8.45,5.0,0.15 1.101,0.0190,0.0010,52,0.0190,Known errors,-1.00,0,-1,-1 20230918_144858,60182.99 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Aug 26, 23:46 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org