1   /* Copyright 2002-2026 CS GROUP
2    * Licensed to CS GROUP (CS) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * CS licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *   http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.orekit.bodies;
18  
19  import org.orekit.frames.Frame;
20  import org.orekit.utils.ExtendedPositionProvider;
21  
22  /** Interface for celestial bodies like Sun, Moon or solar system planets.
23   * @author Luc Maisonobe
24   * @see CelestialBodyFactory
25   */
26  public interface CelestialBody extends ExtendedPositionProvider {
27  
28      /**
29       * Get the body centered ICRF aligned frame. For example, for Earth this
30       * would return GCRF.
31       *
32       * @return body centered, ICRF aligned frame.
33       * @since 14.0
34       */
35      Frame getIcrfAlignedFrame();
36  
37      /** Get an inertially oriented, body centered frame.
38       * <p>The frame is always bound to the body center, and its axes have a
39       * fixed orientation with respect to other inertial frames.</p>
40       * @return an inertially oriented, body centered frame
41       * @see #getBodyOrientedFrame()
42       */
43      Frame getInertiallyOrientedFrame();
44  
45      /** Get a body oriented, body centered frame.
46       * <p>The frame is always bound to the body center, and its axes have a
47       * fixed orientation with respect to the celestial body.</p>
48       * @return a body oriented, body centered frame
49       * @see #getInertiallyOrientedFrame()
50       */
51      Frame getBodyOrientedFrame();
52  
53      /** Get the name of the body.
54       * @return name of the body
55       */
56      String getName();
57  
58      /** Get the attraction coefficient of the body.
59       * @return attraction coefficient of the body (m³/s²)
60       */
61      double getGM();
62  
63  }