IOTA/IOTA-ES occultation update for (207) Hedda / TYC 6804-00660-1 event on 2023 May 30, 20:18 UT Visible from W Australia Summary ------- On 2023 May 30 UT, the 58.8 km diameter asteroid (207) Hedda will occult a 11.2 mag star in the constellation Scorpius for observers along a path across W Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.70 mag to 12.59 mag (the magnitude of the asteroid) for at most 6.410 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 May 30, 20:07 - 2023 May 30, 20:30 * geocentric midpoint of event [JD]: 2460095.34648046 * magnitude of target star: 11.15 * magnitude drop [mag]: 1.70 * estimated maximum duration [s]: 6.410 * Moon: 80 % sunlit, 58° distance * Sun: 174° distance * rough path description: W Australia The occultation path -------------------- * approximate projected width [km]: 61 * 1 sigma uncertainty interval [path widths]: +/- 0.33 * 1 sigma uncertainty interval [seconds]: +/- 3.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.035, +/- 0.022) * 1 sigma uncertainty ellipse (major, minor, PA): (0.035", 0.021", 100°) * approx speed of asteroid's shadow [km/s]: 9.1681 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6804-00660-1 by 207 Hedda on 2023 May 30 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 - 41 0 0 -13 53 40 20 30 5.8 1 118 -2 -13 35 4 -14 12 18 -13 22 53 -14 24 32 .... - 40 0 0 -14 24 41 20 30 5.6 2 117 -4 -14 6 4 -14 43 19 -13 53 53 -14 55 33 0.27 - 39 0 0 -14 55 39 20 30 5.0 3 117 -5 -14 37 2 -15 14 18 -14 24 51 -15 26 32 0.26 - 38 0 0 -15 26 36 20 30 4.2 4 117 -6 -15 7 58 -15 45 15 -14 55 47 -15 57 29 0.26 - 37 0 0 -15 57 28 20 30 3.2 5 117 -7 -15 38 51 -16 16 7 -15 26 40 -16 28 22 0.26 - 36 0 0 -16 28 17 20 30 1.9 6 116 -8 -16 9 39 -16 46 56 -15 57 28 -16 59 10 0.26 - 35 0 0 -16 59 0 20 30 0.3 7 116 -9 -16 40 22 -17 17 39 -16 28 11 -17 29 53 0.26 - 34 0 0 -17 29 37 20 29 58.5 8 116 -10 -17 11 0 -17 48 16 -16 58 49 -18 0 30 0.26 - 33 0 0 -18 0 7 20 29 56.4 9 116 -11 -17 41 30 -18 18 46 -17 29 19 -18 31 0 0.26 - 32 0 0 -18 30 30 20 29 54.2 10 115 -12 -18 11 53 -18 49 8 -17 59 43 -19 1 22 0.26 - 31 0 0 -19 0 44 20 29 51.6 11 115 -13 -18 42 8 -19 19 22 -18 29 58 -19 31 36 0.26 - 30 0 0 -19 30 50 20 29 48.9 12 115 -14 -19 12 14 -19 49 27 -19 0 4 -20 1 40 0.26 - 29 0 0 -20 0 45 20 29 45.9 13 114 -15 -19 42 10 -20 19 22 -19 30 0 -20 31 34 0.26 - 28 0 0 -20 30 30 20 29 42.7 14 114 -16 -20 11 55 -20 49 6 -19 59 46 -21 1 18 0.26 - 27 0 0 -21 0 3 20 29 39.2 16 113 -17 -20 41 30 -21 18 39 -20 29 21 -21 30 51 0.26 - 26 0 0 -21 29 25 20 29 35.6 17 113 -18 -21 10 52 -21 48 0 -20 58 44 -22 0 11 0.26 - 25 0 0 -21 58 34 20 29 31.8 18 113 -19 -21 40 2 -22 17 8 -21 27 55 -22 29 18 0.26 - 24 0 0 -22 27 30 20 29 27.7 19 112 -20 -22 8 59 -22 46 3 -21 56 52 -22 58 13 0.26 - 23 0 0 -22 56 12 20 29 23.5 20 112 -21 -22 37 42 -23 14 44 -22 25 36 -23 26 53 0.26 - 22 0 0 -23 24 40 20 29 19.0 21 111 -22 -23 6 11 -23 43 10 -22 54 6 -23 55 19 0.26 - 21 0 0 -23 52 52 20 29 14.4 22 111 -23 -23 34 25 -24 11 21 -23 22 20 -24 23 29 0.26 - 20 0 0 -24 20 49 20 29 9.6 23 111 -24 -24 2 23 -24 39 17 -23 50 19 -24 51 24 0.26 - 19 0 0 -24 48 30 20 29 4.6 24 110 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51.6 7 244 -2 -17 18 27 -17 55 43 -17 6 15 -18 7 57 0.30 153 0 0 -17 6 26 20 7 50.0 6 244 -1 -16 47 48 -17 25 5 -16 35 37 -17 37 20 0.31 154 0 0 -16 35 42 20 7 48.7 5 243 0 -16 17 4 -16 54 21 -16 4 53 -17 6 36 0.32 155 0 0 -16 4 52 20 7 47.6 4 243 1 -15 46 15 -16 23 32 -15 34 3 -16 35 46 0.33 156 0 0 -15 33 58 20 7 46.8 3 243 2 -15 15 21 -15 52 38 -15 3 9 -16 4 52 0.36 157 0 0 -15 3 1 20 7 46.3 2 242 3 -14 44 23 -15 21 40 -14 32 12 -15 33 54 0.44 158 0 0 -14 32 0 20 7 46.0 1 242 4 -14 13 23 -14 50 39 -14 1 11 -15 2 53 0.76 Uncertainty in time = +/- 3 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: TYC 6804-00660-1 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 43 15.4060 DE: -26 58 16.978 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 43 15.4060 DE: -26 58 16.978 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (207) Hedda asteroid class: approx. diameter [km]: 59 approx. diameter ["]: 0.067 distance from Earth [AU]: 1.21450 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#72 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): 0.035", 0.021", 100.185° remarks: * orbital elements for (207)Hedda : Mean anomaly = 28.1920519711 deg Arg. of pericenter = 192.1404851795 deg Long. of node = 29.1420228006 deg Inclination = 3.8023553921 deg Eccentricity = 0.0295351136 Semimajor axis = 2.2839574541 AU Perihelion dist = 2.2165005111 AU Mag: H = 10.12, G = 0.15 Epoch of elements : MJD 60094.84638889 TDT (2023 May 30.8464) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#722023Apr24,6.41,2023,5,30,20.315531,-0.001614,-0.268732,-5.174618,0.030991,-0.000290,0.000470,0.000001,0.000000 58.3621,-27.0161,-125.33,21.83,False TYC 6804-00660-1,16.72094610,-26.9713828,0.00,11.15,0.00,0.0,0,,16.74531403,-27.0160977,1.70,0.00,0,0,0 207,Hedda,12.59,58.8,1.2145,0,0,-2.804,0.23,,3.2,0 0,27.9504,2023,5,30,192.1405,29.1420,3.8024,0.02954,2.28396,2.21650,10.14,5.0,0.15 1.328,0.0353,0.0213,100,0.0219,Known errors,-1.00,-1,-1,-1 20230530_0660-1,60063.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:32 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org