new ground-based follow up of asteroids observed by gaia · 2011. 5. 10. · 04/05/2011 10 gaia sso...
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04/05/2011 Solar system science before and after Gaia (Pisa)
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Ground-based follow up of
asteroids observed by Gaia
William Thuillot, Gaia-DPAC-CU4
Institut de mécanique céleste et de calcul des éphéméridesIMCCE - Observatoire de Paris – UMR8028 CNRS
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• 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
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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 observation of the probe itself in order to garantee the best orbital positionning
• Gaia-FUN-SSO : Gaia Follow-Up Network for ground based observation of peculiar Solar System Objects (astrometric alerts)
3 ground-based networks :
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Trigger of photometric alerts
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SSO
Gaia observations
≈300.000 asteroids
‣mag. V≤20
‣diam Ø≤700mas
‣ scanning law
‣≈ 60 obs./ SSO
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Aten
distribution of
96obs. over 5yrs
Need of ground-based observations
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Earth &
IEA
Observable region in ecliptic
Gaia will observe at low Solar elongation~ 45 deg.
Detection of Inner Earth Asteroidspossible
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Observers: F. Colas, F. Vachier, M. Birlan (IMCCE)
Pic-du-Midi Obs. (French Pyreneanmont., 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.
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• 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 observations
Solar system science before and after Gaia (Pisa)
Minor PlanetCenter
Lowell
Obs.
ASTORB
CU4-SSO
Data processing
DU…
DU 459
DU451
DU452
SSO update ofthe auxiliary data from MPC/Lowell:- asteroid orbital data
IAU MinorPlanet Center
+Lowell observatory
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Gaia SSO data processing
Gaia DataProcessing
Solar system science before and after Gaia (Pisa)
Gaia FUN
Central Node
Obs. station 1
Obs. Station 2
Obs. Station 3
Minor PlanetCenter
Lowell
Obs.
ASTORB
CU4-SSO
Data processing
DU…
DU 459
DU451
DU452
Coordination
Alert: Critical SSO data
ESA-SSA ?
Gaia DataProcessing
Gaia-FUN-SSO
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+ Follow-Up Network
SSO update ofthe auxiliary data from MPC/Lowell:- asteroid orbital data
IAU MinorPlanet Center
+Lowell observatory
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
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Solar system science before and after Gaia (Pisa)
-sso
41 Participants14 countries33 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 preparation04/05/2011 13
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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)
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Gaia-FUN-SSO observing sites
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From 25 cm to 2.4 m…
Telescope diameter (m)
Gaia-FUN-SSO telescopes
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From limiting magnitude 15 to 25…
Telescope diameter (m)
Lim
itin
g m
agnitude
Gaia-FUN-SSO telescopes
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 disseminates data
CN transforms Gaia data into data usable for
observation and sends to
obs. sites OS -receives topo. ephemerides - access to FOV tool (Aladin)
CN collects the obs. data
(images or MPC format lines) and metadata
CN analyzes images (or MPC format
lines):-Runs Praia
soft-runs other
soft?
CN stores observing data
(images, metadata, MPC format
data)
CN -Improves
ephemerides- sends MPC
format
Gaia data
To MPC
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Gaia-FUN-SSO Work Chain
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 performs OBS.
3. CN receives OBS.
4. CN analyzes data
5. CN stores data
6. CN disseminatesdata
Collaboration with other Gaia network ?
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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 performs OBS.
3. CN receives OBS.
4. CN analyzes data
5. CN stores data
6. CN disseminatesdata
• collaboration or exchange
of experience may be
possible with the other
Gaia networks
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Collaboration with other Gaia network ?
GBOT
Science Alerts
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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
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Gaia Ground-based Follow-up Network for Solar System Objects
Contact: [email protected]