Ground-based follow up of asteroids observed by Gaia William - - PowerPoint PPT Presentation

▶
ground based follow up of
SMART_READER_LITE
LIVE PREVIEW

Ground-based follow up of asteroids observed by Gaia William - - PowerPoint PPT Presentation

Apr 29, 2023 175 likes •413 views

Ground-based follow up of asteroids observed by Gaia William Thuillot, Gaia-DPAC-CU4 Institut de mcanique cleste et de calcul des phmrides IMCCE - Observatoire de Paris UMR8028 CNRS 1 04/05/2011 Solar system science before and

slide-1
SLIDE 1

04/05/2011 Solar system science before and after Gaia (Pisa) 1

Ground-based follow up of asteroids observed by Gaia

William Thuillot,

Gaia-DPAC-CU4 Institut de mécanique céleste et de calcul des éphémérides IMCCE - Observatoire de Paris – UMR8028 CNRS

slide-2
SLIDE 2

04/05/2011 Solar system science before and after Gaia (Pisa) 2

  • 10 million objects will be checked every day
  • Identification of spurious detections to be removed
  • Classification (…moving objects)
  • Identification of specific/critical objects or events
  • Tuning of the algorithms (first 3 months)
  • Gaia alerts
  • Organization of ground-based follow-up networks

Need of ground-based observations

slide-3
SLIDE 3

04/05/2011 Solar system science before and after Gaia (Pisa) 3

Need of ground-based observations

  • Science alerts network: GREAT activity for complementary

ground-based observation of transients (photometric alerts)

  • GBOT network: Ground Based Optical Tracking for Gaia
  • bservation of the probe itself in order to garantee the best
  • rbital positionning
  • Gaia-FUN-SSO : Gaia Follow-Up Network for ground based
  • bservation of peculiar Solar System Objects (astrometric alerts)

3 ground-based networks :

slide-4
SLIDE 4

04/05/2011 Solar system science before and after Gaia (Pisa) 4

Trigger of photometric alerts

slide-5
SLIDE 5

04/05/2011 Solar system science before and after Gaia (Pisa) 5

SSO

Gaia observations

≈300.000 asteroids

  • mag. V≤20
  • diam Ø≤700mas
  • scanning law
  • ≈ 60 obs./ SSO
slide-6
SLIDE 6

04/05/2011 Solar system science before and after Gaia (Pisa) 6

Aten distribution of

  • 96obs. over 5yrs

Need of ground-based observations

slide-7
SLIDE 7

04/05/2011 Solar system science before and after Gaia (Pisa) 7

Earth & IEA

Observable region in ecliptic

Gaia will observe at low Solar elongation ~ 45 deg. Detection of Inner Earth Asteroids possible

slide-8
SLIDE 8

04/05/2011 Solar system science before and after Gaia (Pisa) 8

Observers: F. Colas, F. Vachier,

  • M. Birlan (IMCCE)

 Pic-du-Midi Obs. (French Pyrenean mont., 2877 m)  1m telescope  Dates: 4.8 to 7.8 March 2011  69 observations  Observed in twilight conditions (elong. 49 deg.):

  • Low above the horizon at the

sunset (30-24 deg.)

  • Magnitude : ~21
  • Velocity 2.7 arcsec/min.
slide-9
SLIDE 9

04/05/2011 Solar system science before and after Gaia (Pisa) 9

  • Solar System Objects : important part of the Gaia mission
  • Gaia obs. for asteroids : prec. singl meas.: 0.3-3 mas
  • 300 000 asteroids (most known)
  • including several NEAs, Trojans, Centaurs
  • Other SSO: comets, natural satellites
  • High astrometric accuracy

But…

  • Scanning law
  • Sampling
  • Duration
  • Limiting magnitude

limiting factors for SSO : Complementary GB observations

  • to confirm some new detection
  • to avoid the loss of moving objects
  • to improve orbit poorly observed by Gaia

Need of ground-based SSO

  • bservations
slide-10
SLIDE 10

Solar system science before and after Gaia (Pisa)

Minor Planet Center Lowell Obs. ASTORB

CU4-SSO Data processing

DU… DU 459 DU451 DU452

SSO update of the auxiliary data from MPC/Lowell:

  • asteroid orbital data

IAU Minor Planet Center + Lowell observatory

04/05/2011 10

Gaia SSO data processing

Gaia Data Processing

slide-11
SLIDE 11

Solar system science before and after Gaia (Pisa)

Gaia FUN Central Node

Obs. station 1 Obs. Station 2 Obs. Station 3

Minor Planet Center Lowell Obs. ASTORB

CU4-SSO Data processing

DU… DU 459 DU451 DU452

Coordination Alert: Critical SSO data ESA-SSA ? Gaia Data Processing Gaia-FUN-SSO

04/05/2011 11

+ Follow-Up Network

SSO update of the auxiliary data from MPC/Lowell:

  • asteroid orbital data

IAU Minor Planet Center + Lowell observatory

slide-12
SLIDE 12

http://gaia-fun-sso.imcce.fr

  • Focus: CU4-DU459 objectives
  • Make the network active: first meeting
  • Be informed about the instrumentation
  • Discuss the goals, the methods, the needs
  • Discuss the data policy

2010 Nov. 29 - Dec. 1, Paris observatory SOC: W.Thuillot (France), P

.Tanga (France), J.-E.Arlot (France), J. Berthier, (France),A. Cellino (Italy), D. Hestroffer (France), F . Mignard (France), R. Teixeira (Brazil), Zheng Hong Tang (China)

Solar system science before and after Gaia (Pisa)

  • sso

04/05/2011 12

slide-13
SLIDE 13

Solar system science before and after Gaia (Pisa)

  • sso

41 Participants 14 countries 33 communications

  • Status of the Gaia project
  • DPAC description
  • Role of a follow-up
  • Specificities of SSO obs.
  • Status of observing sites
  • Organization of the Gaia-FUN-SSO

Programme and talks on the Web site (login/passwrd): http://gaia-fun-sso.imcce.fr/Gaia-FUN-SSO-Programme.pdf Proceedings in preparation

04/05/2011 13

slide-14
SLIDE 14

04/05/2011 Solar system science before and after Gaia (Pisa) 14

 19 observ. Sites  29 instruments  4 Schmidt tel.  5 robotic tel. + Other candidate sites (Europe, South America)

Gaia-FUN-SSO observing sites

From census forms received from the observing sites (empty forms can be accessed at gaia-fun-sso.imcce.fr)

slide-15
SLIDE 15

04/05/2011 Solar system science before and after Gaia (Pisa) 15

Gaia-FUN-SSO observing sites

slide-16
SLIDE 16

04/05/2011 Solar system science before and after Gaia (Pisa) 16

From 25 cm to 2.4 m… Telescope diameter (m)

Gaia-FUN-SSO telescopes

slide-17
SLIDE 17

04/05/2011 Solar system science before and after Gaia (Pisa) 17

From limiting magnitude 15 to 25… Telescope diameter (m) Limiting magnitude

Gaia-FUN-SSO telescopes

slide-18
SLIDE 18

Solar system science before and after Gaia (Pisa)

  • 1. CN

Ephem. Dissem.

  • 2. OS

performs OBS.

  • 3. CN

receives OBS.

  • 4. CN

analyzes data

  • 5. CN

stores data

  • 6. CN

dissemina tes data CN transforms Gaia data into data usable for

  • bservation

and sends to

  • bs. sites

OS

  • receives topo.

ephemerides

  • access to

FOV tool (Aladin) CN collects the

  • bs. data

(images or MPC format lines) and metadata CN analyzes images (or MPC format lines):

  • Runs Praia

soft

  • runs other

soft? CN stores

  • bserving data

(images, metadata, MPC format data) CN

  • Improves

ephemerides

  • sends MPC

format

Gaia data To MPC

04/05/2011 18

Gaia-FUN-SSO Work Chain

slide-19
SLIDE 19

Solar system science before and after Gaia (Pisa)

1. Receiving Gaia data and disseminating ephemerides 2. Performing the observation 3. Collecting the data 4. Analyzing the observing data 5. Disseminating the results 6. Storing the data

Work chain

  • 1. CN

Ephem. Dissem .

  • 2. OS

perform s OBS.

  • 3. CN

receive s OBS.

  • 4. CN

analyze s data

  • 5. CN

stores data

  • 6. CN

dissemi nates data

Collaboration with

  • ther Gaia network ?

04/05/2011 19

slide-20
SLIDE 20

Solar system science before and after Gaia (Pisa)

1. Receiving Gaia data and disseminating ephemerides 2. Performing the observation 3. Collecting the data 4. Analyzing the observing data 5. Disseminating the results 6. Storing the data

Work chain

  • 1. CN

Ephem. Dissem .

  • 2. OS

perform s OBS.

  • 3. CN

receive s OBS.

  • 4. CN

analyze s data

  • 5. CN

stores data

  • 6. CN

dissemi nates data

  • collaboration or exchange
  • f experience may be

possible with the other Gaia networks

04/05/2011 20

Collaboration with

  • ther Gaia network ?

 GBOT  Science Alerts

slide-21
SLIDE 21

04/05/2011 Solar system science before and after Gaia (Pisa) 21

Some observing sites ask for more help for astrometry:  Tubitak/Antalya (Turkey)  Astrometry school

  • 5 days + 2 nights
  • 20 students

 Workshop registration deadline May 23

slide-22
SLIDE 22

04/05/2011 Solar system science before and after Gaia (Pisa) 22

Gaia Ground-based Follow-up Network for Solar System Objects Contact: gaia-fun-sso@imcce.fr