emamajek on 14-Sep-2026 23:53:45 GMT about ::error::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: java.lang.StringIndexOutOfBoundsException: offset 4086,length 70 at java.base/java.lang.String.checkOffset(String.java:3289) at java.base/java.lang.AbstractStringBuilder.insert(AbstractStringBuilder.java:1244) at java.base/java.lang.StringBuffer.insert(StringBuffer.java:592) at java.base/java.lang.StringBuffer.insert(StringBuffer.java:106) at java.base/java.lang.AbstractStringBuilder.insert(AbstractStringBuilder.java:1191) at java.base/java.lang.StringBuffer.insert(StringBuffer.java:579) at cds.xml.XmlGen.addAttr(XmlGen.java:310) at cds.xml.Html.addAttr(Html.java:269) at cds.simbad.servlet.SimbadNavigationBar.display(SimbadNavigationBar.java:179) at cds.simbad.servlet.WebSimbadTools.cdsHeader(WebSimbadTools.java:184) at cds.simbad.servlet.WebOutputHtml.begin(WebOutputHtml.java:80) at cds.simbad.servlet.WebOutput.write(WebOutput.java:106) at cds.simbad.servlet.WebSimbadCoo.doPost(WebSimbadCoo.java:363) at cds.simbad.servlet.WebSimbadCoo.doGet(WebSimbadCoo.java:85) at javax.servlet.http.HttpServlet.service(HttpServlet.java:626) at javax.servlet.http.HttpServlet.service(HttpServlet.java:733) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:687) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:357) at org.apache.coyote.ajp.AjpProcessor.service(AjpProcessor.java:433) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:893) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1707) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.base/java.lang.Thread.run(Thread.java:834) ::data:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: V* EF Cha
HD 105234 = EF Cha is a binary star in the Washington Double Star catalog (WDS J12071-7844 = BRC 10) which was resolved by Gaia DR2 and DR3 (the component is not yet in SIMBAD as of 14 Sept 2026). Briceno & Tokovinin (2017) first reported the pair, and their 2nd epoch in 2017 confirmed the system as physical. Kervella+2022 (2022A&A...657A...7K) showed that the astrometry is consistent with it being a gravitationally bound pair, i.e. the stars are statistically codistant and their tangentially velocities differ by only 3.50+-0.16 km/s, whereas the predicted escape velocity at the separation (144 au) of B from A is 5.25 km/s. Both stars are part of the nearby epsilon Cha association (Mamajek+2000, Murphy+2013, Briceno & Tokovinin 2017), part of the greater Sco-Cen complex (Kerr+2023, Ratzenboeck+2023).
WDS J12071-7844A = BRC 10A = Gaia DR3 5788542967759337472 = HD 105234 = EF Cha
WDS J12071-7844B = BRC 10B = Gaia DR3 5788542967753682048
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View annotation on V* EF Cha object