2019 March 22

Asteroid (260) Huberta occulted UCAC4 376-077090 for 18 s. The measured lightdrop was 0.7 mag.

2019 February 27

The uncertain occultation of UCAC4 500-012561 by the asteroid (14446) Kinkowan. The event lasted 0,08 s , i.e. one integration interval.

2019 February 25

Asteroid (3631) Sigyn occults UCAC4 501-012393 for 2,56 s.

2019 February 24

Asteroid (58) Concordia occulted UCAC4 543-024190 for 6,7 s.

2019 January 3

Asteroid (137) Meliboea occulted UCAC4 418-150499 for 1,92 s from Locarno.

2018 December 28

Asteroid (95) Arethusa occulted UCAC4-498-040974 for 7,98 s.

2018 December 24

Centaur (145451) 2005 RM43 occulted UCAC4 534-010144 for 19 s.

2018 December 21

Asteroid (326) Tamara occulted UCAC4-524-054132 for 1,92 s.

2018 November 29

Asteroid (539) Pamina occulted UCAC4 586-14797 for 3,28 s.

2018 November 28

Ateroid (1256) Normannia occulted 4UC 534-004727 for 6,4 s.

2018 October 4

Asteroid (2111) Tselina occulted TYC 0754-01369-1 for 1,48 s.

2018 September 8

At 02:58 UT the GNO_1 and GNO_2 cameras triggered and captured the longest meteor so far. Its duration was 23 s. Video1 and video2.

2018 April 21

Asteroid (130) Elektra occulted TYC 0408-00029-1 for 16,2 s from Gnosca, Bellinzona and Locarno.

2018 April 17

Asteroid (4164) Shilov occulted 4U 411-52807 for 0,9 s.

2018 March 22

Two new probable impact flashes on the Moon were recorded from Gnosca.

2018 March 14

Asteroid (4000) Hipparchus occulted 4UC 574-016894 for 0,6 s.

2018 February 27

Asteroid (466) Tisiphone occulted 2UCAC 41158475 for 11,8 s.

2018 January 28

Asteroid (84522) 2002 TC302 occulted 4UC 593-005847 for 103 s. This is the longest occultation recorded at Gnosca.

2017 December 22

Asteroid (1116) Catriona occulted 4UC 705-043934 for 4.5 s.

2017 December 20

Asteroid (62128) 2000 SO1 occulted 4UC 754-033794 for 1.1 s.

2017 November 30

Asteroid (50) Virginia occulted 4UC 543-025637 for 4.5 s.

2017 November 23

Asteroid (155) Scylla occulted 4UC 523-003622 for 4.4 s.

2017 November 19

Asteroid (38409) 1999 RK205 occulted 4UC 563-016974 for 1.0 s.

2017 October 23

Asteroid (154) Bertha occulted TYC 0638-00660-1 for 11.3 s.

2017 October 14

Asteroid (543) Charlotte occulted 4UC 611-020054 for 17.3 s.

2017 October 13

Asteroid (335) Roberta occulted 4UC 525-008744 for 19.8 s.

2017 October 06

Asteroid (173) Ino occulted TYC 5632-00827-1 for 4.36 s from the remote site Locarno.

2017 March 17

Asteroid (25846) 2000 EF93 probably occulted 4U 423-53132 during 2 integration times. The event is uncertain.

December 31 2016

Three flashes on the Moon (probably related to meteoroid impacts) were detected in 2016.

December 31 2016

Asteroid (1076) Viola occulted 4U 545-29824 for 1.2 s.2016dec31_viola

December 30 2016

Asteroid (754) Malabar occulted 2UCAC 27466644 for 10 s from the remote site Locarno.2016dec30_malabar

December 11 2016

Asteroid (3970) Herran occulted 4U 501-1113 for 0.8 s.2016dec11_herran

November 29 2016

Asteroid (6983) Komatsusakyo occulted 4U 548-29774 for 0.6 s.20161129_komatsusakyo

November 7 2016

Asteroid (2494) Inge occulted 2UCAC 43051828.2016_11_07_inge2016_11_07_inge_2

October 18 2016

Asteroid (43857)1993 VP2 suspectedly occulted 4U 582-5597 for 0.16 s from Gnosca. The event lasted 1 integration time.



October 8 2016

Asteroid (67) Asia occulted TYC 5242-00199-1  for 7.1 s from Gnosca.

A 420 mm newtonian and a 280 mm SC telescope located 2.5 m apart observed the same lightcurve.


September 28 2016

Asteroid (36030) 1999NR59 occulted 1UT 457-443151  for 5.3 s from Gnosca.


September 24 2016

Asteroid (45) Eugenia occulted TYC 1298-00763-1 for 11 s from the remote location of San Bernardino. Observation made with Andrea Manna.


March 1 2016

Asteroid (7) Iris occulted 2UCAC 21800401 for 5.7 s from Gnosca2016_mar_01_Iris

January 13 2016

Asteroid (76) Freia occulted 4UC 369-068390 for 5.1 s from Gnosca2016_01_13_Freia

December 2 2015

Asteroid (1114) Lorraine occulted UCAC4-493-006725 for 6.0 s from Gnosca.2015_Dec_02_Lorraine

October 31 2015

Asteroid (1075) Helina occulted 2UCAC 29389633 with a duration of 1.0 s from Gnosca.


August 20 2015

Asteroid (409) Aspasia occulted 1UT 571-046124 with a duration of 6.4 s from Gnosca.2015_Aug_20_Aspasia_Sposetti

April 9 2015

Asteroid (173) Ino occulted 2UCAC 37328537 with a duration of about 5 s from Gnosca and from Bellinzona.


March 12 2015

Asteroid (216) Kleopatra occulted HIP 54599 with a duration of 4.17 s from Bellinzona and 4.34 s from Lumino.


 March 9 2015

Asteroid (51) Nemausa occulted 4UC382-077757 for about 7 s from Gnosca


February 26 2015

Marco Iten recorded a very interesting flash of light on the Moon. With Raffaello Lena , we prepared a preliminary report of this rare event.

December 11 2014

Asteroid (465) Alekto occulted 2UCAC 40177689 with a duration of 7.97 s from Gnosca.


September 2 2014

Asteroid (924) Toni occulted 4UC 366-150084 with a duration of 17 s from remote site Bellinzona. The event was recorded with RA motors OFF.


August 23 2014

Asteroid (240) Vanadis occulted 4UC 335-172956 with a duration of 5.1 s from remote site Cadagno.


August 15 2014

Asteroid (4889) Praetorius occulted 4UC 442-123218 with a duration of 0.88 s from Gnosca. This is the shortest duration measured so far.


March 31 2014

Asteroid (442) Eichsfeldia occulted 2UCAC 37717864 with a duration of 15.3 s from Gnosca.


March 24 2014

Asteroid (2562) Chaliapin occulted TYC 1933-01727-1 with a duration of 2.4 s from Gnosca.


March 7 2014

Asteroid (9) Metis occulted HIP 78193 for several seconds from 4 stations: Bellinzona, Gnosca, Biasca and Semione.


March 8 2014

Asteroid (51) Neumasa occulted 4UC 514-024427 with a duration of 11.8 s from Gnosca.


February 6 2014

Asteroid (120) Lachesis occulted TYC 2406-00962-1 with a duration of 18.3 s from Gnosca.


January 15 2014

Asteroid (508) Princetonia occulted 2UCAC 45489325 with a duration of 8.6 s from Gnosca.


January 1 2014

Four probable meteoroid lunar impacts were detected in 2013. The number of the detected moon impacts reaches now 17.

September 9 2013

23 Meteors brighter than 0 mag were captured in less than 3 hours above Gnosca. The September Perseids showed a nice and unpredicted spectacle.

August 10 2013

Asteroid (268) Adorea occulted 4UC 355-195889 with a duration of 6.5 s from Gnosca.


August 3 2013

Asteroid (407) Arachne occulted 4UC 319-088789 with a duration of 23 s from remote site Cadagno.


February 6 2013

Asteroid (31) Euphrosyne occulted 2UCAC 40191357 with a duration of 17.3 s from Gnosca and 6.7 s from Iragna. This observation was made with Jacopo Nannini.


 January 26 2013
Asteroid (100) Ekate occulted TYC 0835-01282-1 with a 4.8 sec duration.


January 6 2013

Asteroid (87) Sylvia occulted TYC 1856-00745-1: 25.3 sec duration; 1.7 mag drop. Event captured with Andrea Manna from the remote site Condove.


January 1 2013

Marco Iten and me detected 5 possible meteoroid impacts on the Moon in the year 2013. The grand total is now 13.

November 24 2012

Asteroid (1309) Hyperborea occulted HIP 28558 with a 5 mag lightdrop.


October 8 2012

Asteroid (792) Metcalfia occulted 3UC200-115962. The event lasted 1.2 s.


March 26 2012

Asteroid (712) Boliviana occulted 3UC142-236470. The event lasted 4.5 s.


March 24 2012

Asteroid (686) Gersuind occulted 3UC147-126050. The event lasted 1.8 s.

Gersuind-finale 1

February 21 2012

The Yaogan1 satellite is flashing quite brigthly (brighter than +1mag) with a period of 6.7s above Gnosca.
N. of flashes: 14 (some clouds prevented the sight)
Date: Feb 14 2012
Time: from 04:48:43.4 UT to 04:50:37.8 UT


February 17 2012

Quaoar occulted a 15.2 magV. A videocamera Watec 120N+ working in 10.24 s integration mode was used. The event lasted three integration intervals.


January 5 2012

Asteroid (198) Ampella occulted UCAC2 40143290 on Dec 29 2011. The event was captured from Gnosca and from the remote site Bigorio.


January 1 2012

Eight lunar impact candidates were detected so far (with Marco Iten) from 2 distant observatories. 6 other flashes (with the same characteristics of a meteoroid impact) were detected from only a single observatory.

September 20 2011

Asteroid (895) Helio occulted the 12.5 magV star TYC 2764-01038-1 on Sep 20 2011. The event lasted 3.2 s.


August 14 2011

A bright sporadic fireball illuminated the sky above Gnosca in the night of Aug 13 2011. A movie is here.

August 11 2011

Asteroid (4709) Ennomos occulted the 9.2 mag star TYC 2224-01391-1. The duration of this event was 6.3 s. The event was captured from 2 nearby telescopes. Here a 19MB movie of the occultation.


May 03 2011

Asteroid (42) Isis occulted TYC 1934-01049-1, a 11.3 mag star in Gemini. The duration was about 2 s.


April 22 2011

Several flashes on the Moon were detected on the waxing Moon of April from Gnosca and from Gordola (Marco Iten’s observatory)

April 1 2011

Asteroid (554) Peraga occulted TYC 1343-01414-1. So far, this is the 11th positive occultation from Gnosca.


February 11 2011

A probable impact on the Moon.

January 25 2011

Asteroid (144)Vibilia occulted TYC 1228-00368-1. This event was captured from the observatory with video technique. A 8.56 s duration was measured. It’s the 10th positive occultation recorded. Curiously, the asteroid Vibilia was also observed from Gnosca in a positive 5.1 s double star occultation event the Sep 19 2006. Here a small 4MB AVI file of the event.


December 14 2010

Geminids above Ticino. The all sky camera captured about 270 geminids in the night of december 13/14.

December 10 2010

The brightness of the 12 mag star UCAC2 43911923 was dimmed for 6.8 s by the 14 mag minor planet (249) Ilse.


September 2 2010

The optical counterpart of the GRB100901A was easily detected from Gnosca. About 12h post-detection that point of light was shining between 17 and 18 mag.


September 1 2010

The 14 mag minor planet (1214) Richilde occulted a 10 magV star in the night of August 28 This image shows the CCD drift-scan of the registered event taken with the main 400 mm f/4 telescope of the observatory. The upper trace was only dark subtracted, the lower trace was electronically processed. The red line shows the intensity of the CCD trace.

The lower image shows the intensity variation (blue line) of the same event registerd simultaneously with a small C8 telescope and a WAT120N+ video camera with GPS time insertion. The red vertical line is placed where the beginning of the occultation occured. Yellow and green intensity lines belong to comparison stars.

(1214) Richilde_28Aug2010_Sposetti_1and2

May 22 2010

Flyby of the 20 m asteroid 2010KO10 in the night of May 22/23. This 30 s image shows the about 15 mag asteroid trail.


January 29 2010

In the night of Jan 27 2010 was observed the 7th positive occultation. (626) Notburga occulted 2UCAC 46562578. 5 mins and 12 sec before the predicted event, a first luminosity drop was detected. It’s origin is uncertain.

First and Second occultation_Notburga_2010Jan27

January 15 2010

The 13.3 mag asteroid (442) Eichsfeldia occulted a 12.7 mag star for about 4.8 s in the night of Jan 14 2010.


January 12 2010

The asteroid 2010AL30 captured thru clouds in the evening of Jan 11 2010. (45 images of 14 s each. Luminosity: 17.3 magR).


December 8 2009

The asteroid (52) Europa occulted a 10 mag star in the night of Dec 4 2009.


July 17 2009

Iridium 33 DEB flashes captured.

May 16 2009

Three unusual flashes were detected during the moon surface patrol of April 30.

March 18 2009

The asteroid 2009FH captured when it was at a distance of 320’000 km. See also this page from NASA-JPL.

March 4 2009

An animation of comet C/2007N3 (Lulin) spanning more than 6h.

February 24 2009

Another animation of comet C/2007N3 (Lulin) spanning about 5h.

February 18 2009

This animation of the comet C/2007N3 (Lulin) spans about 1 h and one can see the movement of the ion tail. See also this picture.

October 6 2008

The roughly 3 m size object 2008TC3 crossing the sky of the observatory imaged in this 10MB movie.

January 30 2008

The 250m Potentially Hazardous Asteroid 2007TU24 passed above the european nightsky. The January 28th its distance to the earth  was 720’000 km. The day after its distance was 630’000km.  Its speed was 9,5 km/s relative to the observer. I build up a first and a second animation of this near encounter.


January 1 2008

10 years of minor planet observing : 1998-2008. The total number of  the discovered numbered minor planets at Gnosca is 109. 69th rank worldwide.

November 14 2007

A 21 mag positive detection of the optical counterpart of GRB071112C was done 4 hours and 10 mins after the BAT detection. Using FORS2 the VLT measured a redshift of z = 0.823.Sposetti_GRB071112C__2

October 27 2007

A composite image of the expanding dust of 17P Holmes.

October 25 2007

The outburts of the comet 17P/Holmes photographed between the clouds. With an angular diameter of 2.5 arcmin it is roughly 4 times larger than the angular diameter of Jupiter. Now the comet is a naked eye object in the Perseus constellation.

May 8 2007

Mr. Kazutami Namikoshi, director of the Japan Shiatsu College, and his wife Kyoko were visiting the Gnosca Observatory. The minor planet 61385 Namikoshi was discovered in Gnosca and was dedicated to the memory of Tokujiro Namikoshi (1905-2000) who was the founder of the worldknown Namikoshi Shiatsu therapy.

January 30 2007

Since 2002 ten positive optical GRB counterparts were detected. This time was the turn of GRB070125.

January 2 2007

The GRB060218 was captured from Gnosca the Feb 27 2006 and again the Dec 10 2006.

December 29 2006

The PHA asteroid 2006XG1 was imaged from Gnosca, just in the discovery day (Dec 11) and about 2 weeks after (Dec. 28). See also this link to see the positional measurements.

October 26 2006

The WMAP (Wilkinson Microwave Anisotropy Probe) satellite was imaged from Gnosca in the night of Oct 26 near the antisolar point.

See also this NASA site.

September 21 2006

Captured the transit of HD209458b.

September 20 2006

The occultation of the double star TYC 1879-02151-1 by the asteroid (144) Vibilia was positive. Its duration was 5.1 s. This is the 4th positive occultation recorded here in Gnosca.

August 1 2006

The asteroid (47164)Ticino, previously designed as 1999TX13, is now circling in the sky around the sun. The asteroid Ticino was discovered at Gnosca in 1999.

May 26 2006

At 16:28:30 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 060526.
Observations at Gnosca begun at 20:50 UT, may 26, about 4.5 h later the Swift-BAT-trigger, under fair sky conditions. Imaging lasted until 23:40 UT. As a result a first stacked R-filtered image centred at 21:14 UT  shows the OT at 18.8 mag with SNR = 9. (USNO A2.0 catalog). A second stacked R-filtered image centred at 23:20 UT shows the OT at the same magnitude and same SNR. The measured coordinates of the OT were: RA = 15h 31m 18.34s, decl = +00d 17m 04.7s (UCAC2 catalog). Observations continued from 20:40 UT to 22:30 UT, may 27 (about 27 h later the Swift BAT trigger), under good sky conditions. A stacked R-filtered image centred at 21:35 UT shows the OT at about 21 mag with SNR = 4. (USNO A2.0 catalog). Observations continued from 21:30 UT to 22:50 UT, may 29, under good but windy sky conditions. A stacked unfiltered image centred at 22:10 UT don’t show the OT anymore (limiting mag: about 21 at SNR = 3).

May 15 2006

The MACE2006 (Meeting on Asteroids and Comets in Europe) took place in the austrian capital Wien and ended the May 14 with this group photo.

March 25 2006

The Minor Planet Center accepted the proposal of the observatory to assign the name of the great theoretical physicist John A. Wheeler to the minor planet N. 31555 discovered the march 7 1999 at Gnosca. Here the citation:

John Wheeler (b. 1911) is one of the finest theoretical physicists.
From nuclear physics, to quantum theory, to relativity and gravitation,
Wheeler’s work has set the trajectory of research for half a century.

March 14 2006

The comet C/2006A1 Pojmanski in the morning sky of Gnosca.

February 19 2006

Two images show the shift of the north celestial pole between 2000 and 2006. In six years the apparent center of rotation of the stars has moved by about 2 minutes of arc. This is a manifestation of the drift of the earth rotational axis, also known under the name of precession of the equinoxes.

February 10 2006

The images on GRB060206 begun only 24h after the detection made by the Swift-BAT satellite. In this image one can see the optical counterpart at about 20 mag. A spectra made by the Lick Observatory showed a redshift of z = 4.05 for this OT.

February 7 2006

This article on Astronomy and Astrophysics describes and awards the photometric work made also at Gnosca on the double minor planets Tama, Berna, Frostia and Debussy.

January 24 2006

The night of Jan 24 at 15:55UT the HETE satellite detected a long gamma sky signal. At 19:47UT I could observe the same sky region with my telescope. A faint optical signal very near an annoying 15 mag star was to see. The day after I photographed the sky region anew: apparently the signal faded beyond my detection threshold. Here one can see an animation of the two pictures (of Jan 24 and 25).

These two images show the detection of the GRB060124 (the two white lines show the position of the optical counterpart of the GRB). The blue dots in the graph refer to the intensity of both stars in the picture of the january 24th. The red dots refer to the image of january 25th. From both curves one can see that the optical counterpart had faded.

January 21 2006

In the first hours of January 21 the asteroid 2006BA was traveling at about 750’000 km from the Earth. It was quite rapid and it was heading to the south. Its brightness was around the 17 mag. That night only the friend Peter Birtwhistle of the Great Shefford Observatory (obs code J95) and I from Gnosca (obs code 143) were observing 2006BA. Curiously Peter was shooting CCD pictures exactly at the same moment as I did.
Here the  astrometry of two contemporary observations(to the tenth of a second):

K06B00A C2006 01 21.01788207 28 30.93 +00 56 21.5          16.8 R      J95
K06B00A C2006 01 21.01788307 28 16.00 +00 58 00.6          16.7 R      143

In the left image I show these two positions. The Great Shefford Observatory (J95) is located in Great Britain and is at the North-West from Gnosca (143): therefore the position of the asteroid is more South-East from the position of Gnosca. Between these two positions I could measure about 4 arcminutes, i.e. about 1/8 of the Moon angular diameter. In the right image one can see the original picture of 2006BA taken from Gnosca.Field of view 143 2006BA2006BA_Gnosca

Some hours later 2006BA was transiting at 500’000 km from the earth orbit. This object is not classified as PHA (Potentially Hazardous Asteroid) because it has a too small estimated diameter (roughly 15 m). The positional measurements from Gnosca were the last. No one additional observatory photographed 2006BA.

January 8 2006

The satellite Giove-A, the pioneer of the european fleet of GPS satellite system, was captured above Gnosca the Jan 8 2006. This image shows the faint trace of the satellite transiting at a distance of 23’000 km.