IOTA/IOTA-ES occultation update for (705) Erminia / TYC 7790-00105-1 event on 2023 May 06, 22:59 UT Visible from South America Summary ------- On 2023 May 06 UT, the 141.5 km diameter asteroid (705) Erminia will occult a 11.5 mag star in the constellation Centaurus 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 1.69 mag to 12.96 mag (the magnitude of the asteroid) for at most 9.980 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 06, 22:51 - 2023 May 06, 23:07 * geocentric midpoint of event [JD]: 2460071.45796008 * magnitude of target star: 11.53 * magnitude drop [mag]: 1.69 * estimated maximum duration [s]: 9.980 * Moon: 98 % sunlit, 30° distance * Sun: 155° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 142 * 1 sigma uncertainty interval [path widths]: +/- 0.18 * 1 sigma uncertainty interval [seconds]: +/- 2.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.020, +/- 0.018) * 1 sigma uncertainty ellipse (major, minor, PA): (0.027", 0.005", 132°) * approx speed of asteroid's shadow [km/s]: 14.1787 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7790-00105-1 by 705 Erminia on 2023 May 6 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 - 93 0 0 - 1 43 37 23 6 55.8 0 128 14 .. .. .. - 2 32 44 .. .. .. - 2 50 27 .... - 92 0 0 - 2 31 28 23 6 55.6 2 128 13 - 1 42 22 - 3 20 38 - 1 24 42 - 3 38 22 0.15 - 91 0 0 - 3 19 23 23 6 55.2 3 128 12 - 2 30 15 - 4 8 35 - 2 12 35 - 4 26 19 0.12 - 90 0 0 - 4 7 19 23 6 54.5 4 128 11 - 3 18 10 - 4 56 32 - 3 0 29 - 5 14 16 0.10 - 89 0 0 - 4 55 14 23 6 53.7 6 128 9 - 4 6 5 - 5 44 27 - 3 48 23 - 6 2 11 0.10 - 88 0 0 - 5 43 6 23 6 52.6 7 128 8 - 4 53 57 - 6 32 19 - 4 36 15 - 6 50 3 0.09 - 87 0 0 - 6 30 53 23 6 51.3 8 128 7 - 5 41 44 - 7 20 5 - 5 24 3 - 7 37 49 0.09 - 86 0 0 - 7 18 33 23 6 49.8 9 128 6 - 6 29 26 - 8 7 44 - 6 11 45 - 8 25 28 0.09 - 85 0 0 - 8 6 4 23 6 48.1 11 128 5 - 7 16 59 - 8 55 14 - 6 59 19 - 9 12 57 0.08 - 84 0 0 - 8 53 25 23 6 46.1 12 128 4 - 8 4 22 - 9 42 32 - 7 46 43 -10 0 14 0.08 - 83 0 0 - 9 40 33 23 6 44.0 13 127 2 - 8 51 33 -10 29 37 - 8 33 55 -10 47 19 0.08 - 82 0 0 -10 27 27 23 6 41.7 14 127 1 - 9 38 30 -11 16 28 - 9 20 53 -11 34 8 0.08 - 81 0 0 -11 14 5 23 6 39.1 16 127 0 -10 25 12 -12 3 2 -10 7 37 -12 20 41 0.08 - 80 0 0 -12 0 26 23 6 36.4 17 127 -1 -11 11 37 -12 49 18 -10 54 3 -13 6 55 0.08 - 79 0 0 -12 46 27 23 6 33.5 18 127 -2 -11 57 43 -13 35 14 -11 40 11 -13 52 49 0.08 - 78 0 0 -13 32 7 23 6 30.4 19 126 -3 -12 43 28 -14 20 49 -12 25 58 -14 38 22 0.08 - 77 0 0 -14 17 24 23 6 27.1 20 126 -4 -13 28 52 -15 6 1 -13 11 24 -15 23 32 0.08 - 76 0 0 -15 2 18 23 6 23.7 22 126 -6 -14 13 52 -15 50 48 -13 56 26 -16 8 17 0.08 - 75 0 0 -15 46 47 23 6 20.1 23 126 -7 -14 58 27 -16 35 10 -14 41 3 -16 52 37 0.08 - 74 0 0 -16 30 49 23 6 16.3 24 125 -8 -15 42 36 -17 19 5 -15 25 15 -17 36 29 0.08 - 73 0 0 -17 14 23 23 6 12.4 25 125 -9 -16 26 17 -18 2 32 -16 8 59 -18 19 53 0.08 - 72 0 0 -17 57 28 23 6 8.4 26 125 -10 -17 9 30 -18 45 29 -16 52 15 -19 2 48 0.08 - 71 0 0 -18 40 3 23 6 4.2 28 124 -11 -17 52 13 -19 27 56 -17 35 1 -19 45 11 0.08 - 70 0 0 -19 22 7 23 5 59.8 29 124 -12 -18 34 26 -20 9 51 -18 17 16 -20 27 4 0.08 - 69 0 0 -20 3 38 23 5 55.4 30 124 -13 -19 16 6 -20 51 14 -18 59 0 -21 8 23 0.08 - 68 0 0 -20 44 37 23 5 50.8 31 123 -14 -19 57 14 -21 32 4 -19 40 11 -21 49 10 0.08 - 67 0 0 -21 25 2 23 5 46.1 32 123 -15 -20 37 48 -22 12 19 -20 20 49 -22 29 22 0.08 - 66 0 0 -22 4 52 23 5 41.3 33 122 -16 -21 17 48 -22 52 0 -21 0 52 -23 8 59 0.08 - 65 0 0 -22 44 7 23 5 36.4 34 122 -17 -21 57 13 -23 31 5 -21 40 20 -23 48 1 0.08 - 64 0 0 -23 22 46 23 5 31.4 36 122 -18 -22 36 2 -24 9 34 -22 19 13 -24 26 26 0.08 - 63 0 0 -24 0 49 23 5 26.3 37 121 -19 -23 14 15 -24 47 26 -22 57 29 -25 4 15 0.08 - 62 0 0 -24 38 14 23 5 21.1 38 121 -20 -23 51 51 -25 24 42 -23 35 9 -25 41 26 0.08 - 61 0 0 -25 15 3 23 5 15.8 39 120 -21 -24 28 50 -26 1 19 -24 12 12 -26 18 0 0.08 - 60 0 0 -25 51 13 23 5 10.5 40 120 -22 -25 5 11 -26 37 19 -24 48 37 -26 53 56 0.08 - 59 0 0 -26 26 46 23 5 5.1 41 119 -23 -25 40 54 -27 12 41 -25 24 24 -27 29 14 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Uncertainty in time = +/- 3 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: TYC 7790-00105-1 * constellation : Centaurus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 13 54 58.3622 DE: -38 13 59.112 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 13 54 58.3622 DE: -38 13 59.113 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (705) Erminia asteroid class: approx. diameter [km]: 142 approx. diameter ["]: 0.095 distance from Earth [AU]: 2.04950 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#62 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): 0.027", 0.005", 131.511° remarks: * orbital elements for (705)Erminia : Mean anomaly = 115.0534021775 deg Arg. of pericenter = 102.3185836629 deg Long. of node = 2.7805051889 deg Inclination = 25.0169437778 deg Eccentricity = 0.0511332030 Semimajor axis = 2.9239787299 AU Perihelion dist = 2.7744663319 AU Mag: H = 8.43, G = 0.15 Epoch of elements : MJD 60070.95791667 TDT (2023 May 06.9579) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#622023Apr24,9.98,2023,5,6,22.991042,-0.005236,-0.090403,-7.989250,0.466455,0.001359,0.001987,0.000001,-0.000001 -0.3106,-38.3491,-165.71,16.67,False TYC 7790-00105-1,13.91621173,-38.2330866,0.00,11.53,0.00,0.0,0,,13.93958475,-38.3491317,1.69,0.00,0,0,0 705,Erminia,12.96,141.5,2.0495,0,0,-2.913,2.01,,7.8,0 0,114.8646,2023,5,6,102.3186,2.7805,25.0169,0.05113,2.92398,2.77447,8.45,5.0,0.15 1.180,0.0270,0.0050,132,0.0171,Known errors,-1.00,-1,-1,-1 20230506_0105-1,60063.18 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:22 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org