CCSDS 508.0-R-1, Conjunction Data Message (Red Book, Issue 1 ...

DRAFT CCSDS RECOMMENDED STANDARD FOR CONJUNCTION DATA MESSAGESb) exponents of units are denoted with a double asterisk (i.e., ‘**’, for example, m/s 2 =m/s**2).1.4.1.2 Unit NotationsThe following conventions for unit notations apply throughout this Recommended Standard.Insofar as possible, an effort has been made to use units that are part of the InternationalSystem of Units (SI); units are either SI base units, SI derived units, or units outside the SIthat are accepted for use with the SI (see reference [1]). There is one specific case, that of thenotation for degrees of plane angle, where the notation that is more widely used in thenavigation community is specified (‘deg’ instead of ‘°’), but every effort has been made tominimize these departures from the SI. The units used within this document are as follows:– deg: degrees of plane angle;– km: kilometers;– m: meters;– m/s: meters per second;– m**2/s: square meters per second;– m**2/s**2: square meters per second squared;– d: days, 86400 SI seconds;– h: hours, 3600 SI seconds;– s: SI seconds;– kg: kilograms;– W/kg: watt per kilogram.1.4.2 NOMENCLATURE1.4.2.1 GeneralThe CDM contains information about a conjunction between two space objects (hereafterreferred to as ‘Object1’ and ‘Object2’).1.4.2.2 Normative TextThe following conventions apply for the normative specifications in this RecommendedStandard:a) the words ‘shall’ and ‘must’ imply a binding and verifiable specification;CCSDS 508.0-R-1 Page 1-3 March 2012