New Ground-based follow up of asteroids observed by Gaia · 2011. 5. 10. · 04/05/2011 10 Gaia SSO...

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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• 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



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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


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)


-sso

04/05/2011 12


-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


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


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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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]

New Ground-based follow up of asteroids observed by Gaia · 2011. 5. 10. · 04/05/2011 10 Gaia SSO...

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