diff --git a/src/App.vue b/src/App.vue
index 0db1af1..11d05ad 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -4,23 +4,10 @@
     @select:font="setFont($event)"
     @select:theme="setTheme($event)"
   />
-  <SystemDiagram v-bind="{ star, objects, selectedObject }"
-    @select="selectObject"
-    @update="updateSelectedObject"
-  />
+  <SystemDiagram />
 
   <section id="settings">
-    <ObjectSettings v-if="selectedObject"
-      v-model:name="selectedObject.name"
-      v-model:distance="selectedObject.distance"
-      v-model:type="selectedObject.type"
-      v-model:radius="selectedObject.radius"
-      v-model:rings="selectedObject.rings"
-      v-model:satellites="selectedObject.satellites"
-      :auto-name="autoName(selectedObject)"
-      @delete="deleteObject"
-      @close="editObject(null)"
-    />
+    <ObjectSettings v-if="selectedObject" />
     <Tips>
       <li>Edit planets by clicking directly inside the graphic or in the table below.</li>
       <li>Drag planets around to change their distance.</li>
@@ -28,8 +15,8 @@
       <li>The last removed planet can be restored from the table.</li>
       <li><strong>ONLY THE LAST</strong> removed planet can be restored.</li>
     </Tips>
-    <SystemSettings v-model:designation="star.designation" v-model:radius="star.radius" />
-    <ObjectList v-bind="{ objects, deletedObject, addObject, editObject, deleteObject, restoreDeleted }" />
+    <SystemSettings />
+    <ObjectList />
   </section>
 
 </template>
@@ -43,89 +30,12 @@ import Tips from './components/Tips.vue'
 import SystemSettings from './components/SystemSettings.vue'
 import ObjectList from './components/ObjectList.vue'
 import ObjectSettings from './components/ObjectSettings.vue'
-import { MAX_DISTANCE_PLANET } from './constants'
+import useObjects from './useObjects'
 
-const star = reactive({
-  designation: 'Sol',
-  radius: 400,
-})
-
-const objects = reactive(exampleData)
+const { selectedObject } = useObjects()
 const labelFonts = ['xolonium', 'douar', 'lack']
 const themes = ['default', 'retro', 'inverse', 'paper']
 
-const selectedObject = ref(null)
-const deletedObject = ref(null) // { index: Number, object: Object }
-
-function addObject() {
-  const amount = objects.length
-  let distance = 100
-
-  if (amount) {
-    const lastObject = objects[amount - 1]
-    distance = Math.min(MAX_DISTANCE_PLANET, lastObject.distance + 2*lastObject.radius + 10)
-  }
-
-  objects.push({
-    type: 'planet',
-    name: `${star.designation}-${amount + 1}`,
-    radius: 1,
-    distance,
-    satellites: [],
-    rings: 0,
-  })
-}
-
-function editObject (object) {
-  if (object) {
-    document.documentElement.scrollTop = 0
-    document.body.scrollTop = 0
-  }
-  selectedObject.value = object
-}
-function selectObject (object) {
-  selectedObject.value = object
-}
-
-function updateSelectedObject (payload) {
-  for (const key in payload) {
-    selectedObject.value[key] = payload[key]
-  }
-}
-
-function deleteObject (object) {
-  if (deletedObject.value) {
-    const lost = deletedObject.value.object.name
-    const confirmed = confirm(`
-      Attention! Only the LAST deleted object can be restored.
-      ${lost} will be lost forever! Proceed anyway?`
-    )
-    if (!confirmed) return
-  }
-
-  if (!object) object = selectedObject.value
-  const index = objects.indexOf(object)
-
-  console.debug('deleting object at index', index)
-
-  if (index >= 0) objects.splice(index, 1)
-  if (object === selectedObject.value) selectedObject.value = null
-
-  deletedObject.value = { index, object }
-}
-
-function restoreDeleted () {
-  const { index, object } = deletedObject.value
-  console.debug('restoring deleted object', index)
-  objects.splice(index, 0, object)
-  deletedObject.value = null
-}
-
-function autoName (obj) {
-  const index = objects.indexOf(obj)
-  return `${star.designation}-${index}`
-}
-
 function setTheme (theme) {
   const classes = document.body.className.split(' ')
   const currentTheme = classes.find(c => c.startsWith('theme-'))
diff --git a/src/app.css b/src/app.css
index 4a2fa43..a8aff38 100644
--- a/src/app.css
+++ b/src/app.css
@@ -210,6 +210,9 @@ h1 {
   padding: .25em 1em;
   border-bottom: 2px solid var(--fg-app);
 }
+#object-list tr.selected {
+  font-weight: bold;
+}
 #object-list .cell {
   display: flex;
   justify-content: space-around;
diff --git a/src/components/ObjectList.vue b/src/components/ObjectList.vue
index 8889927..5db327f 100644
--- a/src/components/ObjectList.vue
+++ b/src/components/ObjectList.vue
@@ -4,14 +4,15 @@
       <th scope="col" v-for="col in columns">{{ col }}</th>
       <th scope="col">actions</th>
     </tr>
-    <tr :class="{ deleted: i === deletedObject?.index }" v-for="o,i in objectList">
+    <tr v-for="o,i in objectList" :class="{ selected: o === selectedObject }">
       <td v-for="value in values">
         <div class="cell">{{ o[value] }}</div>
       </td>
       <td><div class="cell">{{ o.satellites.length }}</div></td>
       <td><div class="cell">
-        <button class="settings" @click="editObject(o)">&nbsp;</button>
-        <button class="delete" @click="deleteObject(o)">&nbsp;</button>
+        <button class="settings" title="Configure Object" @click="editObject(o)">&nbsp;</button>
+        <button class="dice" title="Randomize Object Values" @click="randomizeObject(o)">&nbsp;</button>
+        <button class="delete" title="Delete Object" @click="deleteObject(o)">&nbsp;</button>
       </div></td>
       <button v-if="i === deletedObject?.index"
         class="deleted-overlay"
@@ -20,30 +21,41 @@
         RESTORE DELETED OBJECT
       </button>
     </tr>
-    <button class="add" @click="addObject">&nbsp;</button>
+    <button class="add" title="Add New Object" @click="addObject">&nbsp;</button>
   </table>
 </template>
 
 <script setup>
 import { computed } from 'vue'
+import useObjects from '../useObjects'
 
-const props = defineProps({
-  objects: Array,
-  deletedObject: [Object, null],
-  addObject: Function,
-  editObject: Function,
-  deleteObject: Function,
-  restoreDeleted: Function,
-})
+const {
+  objects,
+  selectedObject,
+  deletedObject,
+  addObject,
+  deleteObject,
+  restoreDeleted,
+  randomizeObject,
+} = useObjects()
 
 const columns = ['Δ', 'Name', 'Type', 'Radius', 'Rings', 'Satellites']
 const values = ['distance', 'name', 'type', 'radius', 'rings']
 const objectList = computed(() => {
-  if (!props.deletedObject) return props.objects
+  if (!deletedObject.value) return objects
 
-  const { index, object } = props.deletedObject
-  const objects = [ ...props.objects ]
-  objects.splice(index, 0, object)
-  return objects
+  const { index, object } = deletedObject.value
+  const objects_ = [ ...objects ]
+  objects_.splice(index, 0, object)
+  return objects_
 })
+
+function editObject (object) {
+  if (object) {
+    document.documentElement.scrollTop = 0
+    document.body.scrollTop = 0
+  }
+  selectedObject.value = object
+}
+
 </script>
diff --git a/src/components/ObjectSettings.vue b/src/components/ObjectSettings.vue
index 9ed7226..123f301 100644
--- a/src/components/ObjectSettings.vue
+++ b/src/components/ObjectSettings.vue
@@ -8,51 +8,50 @@
     <section class="main">
       <div>
         <input type="text" class="big"
-          :value="name"
-          @input="checkName($event.target.value)"
+          :value="selectedObject.name"
+          @input="update('name', $event.target.value)"
         />
       </div>
       <div>
         Distance Δ:
         <input type="number" :min="MIN_DISTANCE_PLANET" :max="MAX_DISTANCE_PLANET"
-          :value="distance"
+          :value="selectedObject.distance"
           @input="update('distance', $event.target.value)"
         />
       </div>
       <div>
         Radius r:
         <input type="number" :min="MIN_SIZE_PLANET" :max="MAX_SIZE_PLANET"
-          :value="radius"
+          :value="selectedObject.radius"
           @input="update('radius', $event.target.value)"
         />
       </div>
       <div>
         Rings:
         <input type="number" :min="MIN_AMOUNT_RINGS" :max="MAX_AMOUNT_RINGS"
-          :value="rings"
+          :value="selectedObject.rings"
           @input="update('rings', $event.target.value)"
         />
       </div>
-      <button class="close" title="close" @click="$emit('close')">&nbsp;</button>
+      <button class="close" title="close" @click="close">&nbsp;</button>
     </section>
 
-    <SatelliteSettings :satellites="satellites" @update:satellites="update('satellites', $event)" />
+    <SatelliteSettings :satellites="selectedObject.satellites" @update:satellites="update('satellites', $event)" />
 
     <section class="additional-options">
       Other options:
-      <button class="cta danger" @click="$emit('delete')">REMOVE OBJECT</button>
+      <button class="cta danger" @click="deleteObject()">REMOVE OBJECT</button>
     </section>
   </div>
 </template>
 
 <script setup>
 import { ref, computed } from 'vue'
+import useObjects from '../useObjects'
 import Tips from './Tips.vue'
 import SatelliteSettings from './SatelliteSettings.vue'
 
 import {
-  MIN_SIZE_STAR,
-  MAX_SIZE_STAR,
   MIN_SIZE_PLANET,
   MAX_SIZE_PLANET,
   MIN_DISTANCE_PLANET,
@@ -61,36 +60,22 @@ import {
   MAX_AMOUNT_RINGS,
 } from '../constants'
 
-const props = defineProps({
-  distance: Number,
-  name: String,
-  type: String,
-  radius: Number,
-  rings: Number,
-  satellites: Array,
-  autoName: String, // auto generated name, like Sol-3
-})
-const emit = defineEmits([
-  'update:distance',
-  'update:name',
-  'update:type',
-  'update:radius',
-  'update:rings',
-  'update:satellites',
-  'delete',
-  'close',
-])
+const {
+  selectedObject,
+  deleteObject,
+  updateSelectedObject,
+} = useObjects()
 
 const numberTargets = ['distance', 'radius', 'rings']
 
 function update (target, value) {
   console.debug('updating', target, 'with', value)
   if (numberTargets.indexOf(target) >= 0) value = parseInt(value)
-  emit(`update:${target}`, value)
+
+  updateSelectedObject({ [target]: value })
 }
 
-function checkName (name) {
-  if (!name.trim().length) name = props.autoName
-  update('name', name)
+function close () {
+  selectedObject.value = null
 }
 </script>
diff --git a/src/components/SystemDiagram.vue b/src/components/SystemDiagram.vue
index 716a041..2fe7565 100644
--- a/src/components/SystemDiagram.vue
+++ b/src/components/SystemDiagram.vue
@@ -34,26 +34,15 @@
 
 <script setup>
 import { ref, computed } from 'vue'
-import { steepCurve } from '../utils'
-import {
-  MIN_SIZE_PLANET,
-  MAX_SIZE_PLANET,
-  MIN_DISTANCE_PLANET,
-  MAX_DISTANCE_PLANET,
-} from '../constants'
+import useObjects from '../useObjects'
 
-const props = defineProps({
-  star: Object,
-  objects: Array,
-  selectedObject: Object,
-})
-
-const emit = defineEmits([ 'select', 'update' ])
-
-const starCX = computed(() => {
-  const r = props.star.radius
-  return -1 * r * steepCurve(r, 50, 0.955)
-})
+const {
+  star,
+  starCX,
+  objects,
+  selectedObject,
+  updateSelectedObject,
+} = useObjects()
 
 const draggedObject = ref(null)
 const draggingDelta = ref(0)
@@ -69,12 +58,8 @@ function stopDragging (event) {
   event.target.removeEventListener('pointerup', stopDragging)
   console.debug('stop draggin', draggedObject.value.name)
 
-  let distance = draggedObject.value.distance + draggingDelta.value
-
-  if (distance < MIN_DISTANCE_PLANET) distance = MIN_DISTANCE_PLANET
-  if (distance > MAX_DISTANCE_PLANET) distance = MAX_DISTANCE_PLANET
-
-  emit('update', { distance })
+  const distance = draggedObject.value.distance + draggingDelta.value
+  updateSelectedObject({ distance })
 
   dragStart = 0
   draggingDelta.value = 0
@@ -88,8 +73,7 @@ function updateDelta (event) {
 
 function startDragging (event, object) {
   console.debug('start draggin', object.name)
-
-  emit('select', object)
+  selectedObject.value = object
 
   // we can savely assume that the windows width is not changing while dragging
   pixelFactor = 1000 / document.body.offsetWidth
@@ -104,23 +88,16 @@ function startDragging (event, object) {
 }
 
 function resizeObject (event) {
-  if (!props.selectedObject) return
+  if (!selectedObject.value) return
 
   event.preventDefault()
 
-  let radius = props.selectedObject.radius
+  let radius = selectedObject.value.radius
   radius = radius + event.deltaY * -0.01
 
   if (event.deltaY > 0) radius = Math.floor(radius)
   else radius = Math.ceil(radius)
 
-  if (radius < MIN_SIZE_PLANET) radius = MIN_SIZE_PLANET
-  if (radius > MAX_SIZE_PLANET) radius = MAX_SIZE_PLANET
-
-  emit('update', { radius })
-}
-
-function onDragEnter (event) {
-  console.log('SystemDiagram onDragEnter', event)
+  updateSelectedObject({ radius })
 }
 </script>
diff --git a/src/components/SystemSettings.vue b/src/components/SystemSettings.vue
index 4666330..32eba49 100644
--- a/src/components/SystemSettings.vue
+++ b/src/components/SystemSettings.vue
@@ -4,20 +4,17 @@
     <menu id="system-settings">
       <label>
         Name
-        <input type="text"
-          :value="designation"
-          @input="update('designation', $event.target.value)"
-        />
+        <input type="text" v-model="star.designation" />
       </label>
       <label>
         Star Size
         <input type="range"
           :min="MIN_SIZE_STAR"
           :max="MAX_SIZE_STAR"
-          :value="radius"
-          @input="update('radius', $event.target.value)"
+          :value="star.radius"
+          @input="updateRadius($event.target.value)"
         />
-        ({{ radius }})
+        ({{ star.radius }})
       </label>
     </menu>
   </header>
@@ -25,22 +22,15 @@
 
 <script setup>
 import { ref } from 'vue'
+import useObjects from '../useObjects'
 import {
   MIN_SIZE_STAR,
   MAX_SIZE_STAR,
 } from '../constants'
 
-const props = defineProps({
-  designation: String,
-  radius: Number,
-})
-const emit = defineEmits([
-  'update:designation',
-  'update:radius',
-])
+const { star } = useObjects()
 
-function update (target, value) {
-  if (target === 'radius') value = parseInt(value)
-  emit(`update:${target}`, value)
+function updateRadius (radius) {
+  star.radius = parseInt(radius)
 }
 </script>
diff --git a/src/example-data.js b/src/example-data.js
index 73d4408..1375bb5 100644
--- a/src/example-data.js
+++ b/src/example-data.js
@@ -1,38 +1,44 @@
-export default [
-  { type: 'planet', name: 'Mercury', radius: 1, distance: 100, satellites: [], rings: 0 },
-  { type: 'planet', name: 'Venus', radius: 4, distance: 120, satellites: [], rings: 0 },
-  { type: 'planet', name: 'Terra', radius: 4, distance: 140, satellites: [
-    { name: 'ISS', radius: 1, type: 'station' },
-    { name: 'Luna', radius: 2, type: 'moon' },
-  ], rings: 0 },
-  { type: 'planet', name: 'Mars', radius: 2, distance: 160, satellites: [
-    { name: 'MTO', radius: 1, type: 'station' },
-    { name: 'Phobos', radius: 1, type: 'moon' },
-    { name: 'Daimos', radius: 1, type: 'moon' },
-  ], rings: 0 },
-  { type: 'planet', name: 'Jupiter', radius: 40, distance: 260, satellites: [
-    { name: 'Io', radius: 2, type: 'moon' },
-    { name: 'Europa', radius: 2, type: 'moon' },
-    { name: 'Ganymede', radius: 4, type: 'moon' },
-    { name: 'Callisto', radius: 3, type: 'moon' },
-  ], rings: 1 },
-  { type: 'planet', name: 'Saturn', radius: 36, distance: 410, satellites: [
-    { name: 'Mimas', radius: 1, type: 'moon' },
-    { name: 'Enceladus', radius: 1, type: 'moon' },
-    { name: 'Tethys', radius: 1, type: 'moon' },
-    { name: 'Dione', radius: 1, type: 'moon' },
-    { name: 'Rhea', radius: 1, type: 'moon' },
-    { name: 'Titan', radius: 3, type: 'moon' },
-    { name: 'Iapetus', radius: 1, type: 'moon' },
-  ], rings: 5 },
-  { type: 'planet', name: 'Uranus', radius: 16, distance: 680, satellites: [
-    { name: 'Miranda', radius: 1, type: 'moon' },
-    { name: 'Ariel', radius: 1, type: 'moon' },
-    { name: 'Umbriel', radius: 1, type: 'moon' },
-    { name: 'Titania', radius: 1, type: 'moon' },
-    { name: 'Oberon', radius: 1, type: 'moon' },
-  ], rings: 2 },
-  { type: 'planet', name: 'Neptune', radius: 15, distance: 950, satellites: [
-    { name: 'Triton', radius: 1, type: 'moon' },
-  ], rings: 0 },
-]
+export default {
+  star: {
+    designation: 'Sol',
+    radius: 400,
+  },
+  objects: [
+    { type: 'planet', name: 'Mercury', designation: 'Sol-1', radius: 1, distance: 100, satellites: [], rings: 0 },
+    { type: 'planet', name: 'Venus', designation: 'Sol-2', radius: 4, distance: 120, satellites: [], rings: 0 },
+    { type: 'planet', name: 'Terra', designation: 'Sol-3', radius: 4, distance: 140, satellites: [
+      { name: 'ISS', radius: 1, type: 'station' },
+      { name: 'Luna', radius: 2, type: 'moon' },
+    ], rings: 0 },
+    { type: 'planet', name: 'Mars', designation: 'Sol-4', radius: 2, distance: 160, satellites: [
+      { name: 'MTO', radius: 1, type: 'station' },
+      { name: 'Phobos', radius: 1, type: 'moon' },
+      { name: 'Daimos', radius: 1, type: 'moon' },
+    ], rings: 0 },
+    { type: 'planet', name: 'Jupiter', designation: 'Sol-5', radius: 40, distance: 260, satellites: [
+      { name: 'Io', radius: 2, type: 'moon' },
+      { name: 'Europa', radius: 2, type: 'moon' },
+      { name: 'Ganymede', radius: 4, type: 'moon' },
+      { name: 'Callisto', radius: 3, type: 'moon' },
+    ], rings: 1 },
+    { type: 'planet', name: 'Saturn', designation: 'Sol-6', radius: 36, distance: 410, satellites: [
+      { name: 'Mimas', radius: 1, type: 'moon' },
+      { name: 'Enceladus', radius: 1, type: 'moon' },
+      { name: 'Tethys', radius: 1, type: 'moon' },
+      { name: 'Dione', radius: 1, type: 'moon' },
+      { name: 'Rhea', radius: 1, type: 'moon' },
+      { name: 'Titan', radius: 3, type: 'moon' },
+      { name: 'Iapetus', radius: 1, type: 'moon' },
+    ], rings: 5 },
+    { type: 'planet', name: 'Uranus', designation: 'Sol-7', radius: 16, distance: 680, satellites: [
+      { name: 'Miranda', radius: 1, type: 'moon' },
+      { name: 'Ariel', radius: 1, type: 'moon' },
+      { name: 'Umbriel', radius: 1, type: 'moon' },
+      { name: 'Titania', radius: 1, type: 'moon' },
+      { name: 'Oberon', radius: 1, type: 'moon' },
+    ], rings: 2 },
+    { type: 'planet', name: 'Neptune', designation: 'Sol-8', radius: 15, distance: 950, satellites: [
+      { name: 'Triton', radius: 1, type: 'moon' },
+    ], rings: 0 },
+  ],
+}
diff --git a/src/useObjects.js b/src/useObjects.js
new file mode 100644
index 0000000..6c11b68
--- /dev/null
+++ b/src/useObjects.js
@@ -0,0 +1,117 @@
+import { reactive, ref, computed } from 'vue'
+import {
+  MIN_SIZE_STAR,
+  MAX_SIZE_STAR,
+  MIN_SIZE_PLANET,
+  MAX_SIZE_PLANET,
+  MIN_DISTANCE_PLANET,
+  MAX_DISTANCE_PLANET,
+  MIN_AMOUNT_RINGS,
+  MAX_AMOUNT_RINGS,
+} from './constants'
+import { steepCurve } from './utils'
+import exampleData from './example-data.js'
+
+
+const star = reactive(exampleData.star)
+const objects = reactive(exampleData.objects)
+const selectedObject = ref(null)
+const deletedObject = ref(null) // { index: Number, object: Object }
+
+const starCX = computed(() => {
+  const r = star.radius
+  return -1 * r * steepCurve(r, 50, 0.955)
+})
+
+export default function useObjects () {
+
+  function addObject() {
+    const amount = objects.length
+    let distance = 100
+
+    if (amount) {
+      const lastObject = objects[amount - 1]
+      distance = Math.min(MAX_DISTANCE_PLANET, lastObject.distance + 2*lastObject.radius + 10)
+    }
+
+    objects.push({
+      type: 'planet',
+      name: `${star.designation}-${amount + 1}`,
+      radius: 1,
+      distance,
+      satellites: [],
+      rings: 0,
+    })
+  }
+
+  function updateSelectedObject (payload) {
+    if (payload.name && !payload.name.trim().length) {
+      payload.name = selectedObject.value.designation
+    }
+    if (payload.distance) {
+      payload.distance = Math.max(MIN_DISTANCE_PLANET, payload.distance)
+      payload.distance = Math.min(MAX_DISTANCE_PLANET, payload.distance)
+    }
+    if (payload.radius) {
+      payload.radius = Math.max(MIN_SIZE_PLANET, payload.radius)
+      payload.radius = Math.min(MAX_SIZE_PLANET, payload.radius)
+    }
+    if (payload.rings) {
+      payload.rings = Math.max(MIN_AMOUNT_RINGS, payload.rings)
+      payload.rings = Math.min(MAX_AMOUNT_RINGS, payload.rings)
+    }
+    for (const key in payload) {
+      selectedObject.value[key] = payload[key]
+    }
+  }
+
+  function deleteObject (object) {
+    if (deletedObject.value) {
+      const lost = deletedObject.value.object.name
+      const confirmed = confirm(`
+        Attention! Only the LAST deleted object can be restored.
+        ${lost} will be lost forever! Proceed anyway?`
+      )
+      if (!confirmed) return
+    }
+
+    if (!object) object = selectedObject.value
+    const index = objects.indexOf(object)
+
+    console.debug('deleting object at index', index)
+
+    if (index >= 0) objects.splice(index, 1)
+    if (object === selectedObject.value) selectedObject.value = null
+
+    deletedObject.value = { index, object }
+  }
+
+  function restoreDeleted () {
+    const { index, object } = deletedObject.value
+    console.debug('restoring deleted object', index)
+    objects.splice(index, 0, object)
+    deletedObject.value = null
+  }
+
+  function autoName (object) {
+    const index = objects.indexOf(object)
+    return `${star.designation}-${index}`
+  }
+
+  function randomizeObject (object) {
+  }
+
+  return {
+    star,
+    starCX,
+    objects,
+    selectedObject,
+    deletedObject,
+    addObject,
+    deleteObject,
+    updateSelectedObject,
+    restoreDeleted,
+    randomizeObject,
+    autoName,
+  }
+}