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News and Announcements
Friday, March 23, 2018 - 14:47
AAVSO Annual Report for 2016-2017 online
Thursday, March 22, 2018 - 12:28
Solar Observing Guide in Portuguese
Wednesday, March 21, 2018 - 19:20
Alert Notice 626: Bright nova in Carina - ASASSN-18fv
Wednesday, March 21, 2018 - 15:08
Alert Notice 625: ASASSN-18ey = MAXI J1820+070 coverage needed for VLT and XMM
Monday, March 19, 2018 - 08:03
Alert Notice 624: Observations requested for ASASSN-18ey = MAXI J1820+070
Friday, March 16, 2018 - 16:20
Solar Bulletin - Volume 74, Number 2
Friday, March 16, 2018 - 14:59
Alert Notice 623: Observations of V1017 Sgr requested
Thursday, March 15, 2018 - 16:00
Alert Notice 622: N Oph 2018 No. 2 = TCP J17140253-2849233 = PNV J17140261-2849237 [V3665 Oph]
Thursday, March 15, 2018 - 14:01
Alert Notice 621: Optical monitoring of NSV 24045 = HD 163296
Wednesday, March 14, 2018 - 18:26
Alert Notice 620: Coverage of Nova LMC 1996 (OGLE-2018-NOVA-01) outburst needed now
Friday, March 9, 2018 - 16:00
Solar Observing Guide in Italian
Tuesday, March 6, 2018 - 14:48
Alert Notice 619: Nova Ophiuchi 2018 = PNV J17244011-2421463
Monday, March 5, 2018 - 16:38
Alert Notice 618: Monitoring SDSS J153817.35+512338.0 for HST observations
Monday, March 5, 2018 - 13:00
Alert Notice 617: Multiwavelength observations of YZ Cnc, SU UMa, and CR Boo outbursts
Thursday, March 1, 2018 - 09:52
LPV of the Month March, 2018
Tuesday, February 27, 2018 - 16:49
AAVSO Bulletin 81 for 2018 published
Wednesday, February 21, 2018 - 17:01
Solar Observing Guide in Spanish
Tuesday, February 13, 2018 - 15:03
AAVSO Alert Notice 616: Nova Sco 2018 No. 2 = PNV J16484962-4457032
Monday, February 12, 2018 - 19:28
Alert Notice 615: ASASSN-18ca = PNV J00423439+4044255 - Probable Nova in M31
Monday, February 12, 2018 - 16:20
Alert Notice 614 : Monitoring of GW Lib to support XMM-Newton observation
Monday, February 12, 2018 - 16:17
Solar Bulletin - Volume 74, Number 1
Wednesday, January 31, 2018 - 15:56
Alert Notice 613: Nova Cir 2018 - PNV J13532700-6725110 [FM Cir]
Wednesday, January 31, 2018 - 15:45
Alert Notice 612: Nova Sco 2018 - PNV J17180658-3204279
Wednesday, January 31, 2018 - 15:32
LPV of the Month February, 2018
Friday, January 26, 2018 - 18:19
Alert Notice 611: Flaring of Blazar 3C 279
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About Us
The Organization
Vision/Mission
Services
What We Do
History and Archives
Volunteer
Funds
Contact Us
By-Laws
The People
Board: Officers and Members
Staff
Section Leaders
Honors & Awards
In Memoriam
Outreach
Presentation Library
The Location
AAVSO Headquarters
Directions
Guest Suite
Our Publications
Annual Report
Journal of the AAVSO
AAVSO Newsletter
Solar Bulletin
plus many more...
Apply for Membership
Renew Membership
Community
Meetings
Forums
Find a Member/Observer
Who's Online
Variable Stars
What Are They & Why Observe Them?
The Stories Variables Tell
Types of Variable Stars: A Guide for Beginners
Educational Materials
CHOICE Online Institute
CCD School Videos
Student Projects
Variable Star Astronomy
H-R Diagram Plotting Activity
Reporting Variable Star Discoveries
Variable Star Index (VSX)
AAVSO in Print - Publications Using AAVSO Data
Observing
Observing at a Glance
Observing Sections
Alert Notices & Observing Campaigns
Observing Manuals
Visual Observing Manual
Charge-Coupled Device (CCD) Camera Photometry Guide
Digital Single Lens Reflex (DSLR) Camera Observing Manual
Exoplanet Observing Guide
PEP Observer's Guide
Solar Observing Guide
AAVSO Guide to Getting Started in Spectroscopy
WebObs (Search AID or Submit Your Data)
Variable Star Charts
Variable Star Plotter (VSP)
Report Chart Errors
Request Comparison Stars
Chart and Sequence Updates
AAVSO Target Tool
Observation Planner Tool
JD Calculator & Calendar
Software Directory
Data
For researchers: support and data access
AAVSO International Database (AID)
WebObs (Submit/Search Data)
Exoplanet Database
Data Access
Download Data in ASCII Form
Light Curve Generator (LCGv2)
Light Curve Generator (LCGv1)
MyNewsFlash - Real-Time Data Delivery
WebObs Search (Search the AID)
Data Analysis
Transformation
VPHOT - Online Photometry Tool
Zapper - Help Validate Data
VStar - Java Visualization & Analysis Tool
Historic Light Curves
The AAVSO Photometric All-Sky Survey (APASS)
AAVSOnet Epoch Photometry Database
AAVSOnet
Eggen Card Project
Getting Started
What Are Variable Stars?
Things to Do
Find a Mentor
Online Forum for Help and Advice
Observing Tutorials
10-Star Tutorial (Visual Observations of Variable Stars)
5-Star Tutorial (Data Analysis)
Observing Sections
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