diff --git a/public/asteroid_temp.php b/public/asteroid_temp.php
new file mode 100644
index 0000000..cb8806c
--- /dev/null
+++ b/public/asteroid_temp.php
@@ -0,0 +1,376 @@
+<?php
+declare(strict_types=1);
+
+ini_set('display_errors', '1');
+error_reporting(E_ALL);
+session_start();
+
+$loggedIn = isset($_SESSION['user_id']);
+$pageTitle = 'Asteroidtemperatur – AstroTools';
+$headerIntroPre = 'Astronomie-Werkzeuge';
+$headerIntroTitle = 'Asteroid-Temperaturrechner';
+$headerIntroSub = 'Gleichgewichts- und Subsolartemperatur eines Asteroiden berechnen (NEATM).';
+?>
+<?php require __DIR__ . '/header.php'; ?>
+
+<style>
+.at-layout {
+    display: grid;
+    grid-template-columns: 1fr 1fr;
+    gap: 1.5rem;
+    align-items: start;
+}
+@media (max-width: 700px) {
+    .at-layout { grid-template-columns: 1fr; }
+}
+
+.at-param-grid {
+    display: grid;
+    grid-template-columns: 1fr 1fr;
+    gap: 0.75rem 1rem;
+}
+@media (max-width: 480px) {
+    .at-param-grid { grid-template-columns: 1fr; }
+}
+
+.at-param {
+    display: flex;
+    flex-direction: column;
+    gap: 0.3rem;
+}
+.at-param label {
+    font-size: 0.78rem;
+    color: var(--text-dim);
+    letter-spacing: 0.04em;
+}
+.at-param input[type=range] {
+    width: 100%;
+    accent-color: var(--gold);
+    cursor: pointer;
+}
+.at-param .at-num {
+    display: flex;
+    align-items: center;
+    gap: 0.5rem;
+}
+.at-param .at-num input[type=number] {
+    flex: 1;
+    background: var(--bg);
+    border: 1px solid var(--border);
+    border-radius: var(--radius);
+    color: var(--text);
+    padding: 0.35rem 0.6rem;
+    font-size: 0.92rem;
+    min-width: 0;
+}
+.at-param .at-num input[type=number]:focus {
+    outline: none;
+    border-color: var(--gold-dim);
+}
+.at-param .at-unit {
+    font-size: 0.78rem;
+    color: var(--text-dim);
+    white-space: nowrap;
+}
+.at-hint {
+    font-size: 0.75rem;
+    color: var(--text-dim);
+    line-height: 1.45;
+    min-height: 2.2em;
+}
+
+/* Ergebnisse */
+.at-results {
+    display: flex;
+    flex-direction: column;
+    gap: 1rem;
+}
+.at-result-row {
+    display: flex;
+    align-items: baseline;
+    gap: 0.6rem;
+    flex-wrap: wrap;
+}
+.at-result-label {
+    font-size: 0.78rem;
+    color: var(--text-dim);
+    min-width: 4.5rem;
+}
+.at-result-sym {
+    font-family: 'Georgia', serif;
+    font-style: italic;
+    color: var(--gold-pale);
+    font-size: 1rem;
+    min-width: 3rem;
+}
+.at-result-val {
+    font-size: 1.45rem;
+    font-weight: 600;
+    color: var(--gold);
+    letter-spacing: 0.01em;
+}
+.at-result-c {
+    font-size: 0.9rem;
+    color: var(--text-dim);
+}
+
+/* Albedo-Vorschau */
+.at-albedo-wrap {
+    display: flex;
+    align-items: center;
+    gap: 0.75rem;
+    margin-top: 0.5rem;
+}
+.at-albedo-swatch {
+    width: 2.2rem;
+    height: 2.2rem;
+    border-radius: 50%;
+    border: 1px solid var(--border);
+    flex-shrink: 0;
+    transition: background 0.2s;
+}
+.at-albedo-label {
+    font-size: 0.78rem;
+    color: var(--text-dim);
+}
+
+/* Preset-Buttons */
+.at-presets {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 0.45rem;
+    margin-top: 0.25rem;
+}
+
+/* Trennlinie */
+.at-divider {
+    border: none;
+    border-top: 1px solid var(--border);
+    margin: 0.75rem 0;
+}
+</style>
+
+<div class="at-layout">
+
+    <!-- Linke Spalte: Eingaben -->
+    <div class="card">
+        <h2>Parameter</h2>
+
+        <div class="at-param-grid">
+
+            <div class="at-param">
+                <label for="at-r">Sonnenabstand <em>r</em></label>
+                <div class="at-num">
+                    <input type="number" id="at-r" min="0.05" max="50" step="0.01" value="1.00">
+                    <span class="at-unit">AE</span>
+                </div>
+                <input type="range" id="at-r-slider" min="0.05" max="10" step="0.01" value="1.00">
+                <p class="at-hint">Abstand zur Sonne in Astronomischen Einheiten. Einstrahlung skaliert mit 1/r².</p>
+            </div>
+
+            <div class="at-param">
+                <label for="at-a">Bond-Albedo <em>A</em></label>
+                <div class="at-num">
+                    <input type="number" id="at-a" min="0" max="0.999" step="0.001" value="0.050">
+                    <span class="at-unit">0–1</span>
+                </div>
+                <input type="range" id="at-a-slider" min="0" max="0.999" step="0.001" value="0.050">
+                <p class="at-hint">Anteil der reflektierten Gesamtenergie. Dunkel ≈ 0,02–0,10.</p>
+            </div>
+
+            <div class="at-param">
+                <label for="at-eps">Emissivität <em>ε</em></label>
+                <div class="at-num">
+                    <input type="number" id="at-eps" min="0.01" max="1" step="0.01" value="0.90">
+                    <span class="at-unit">0–1</span>
+                </div>
+                <input type="range" id="at-eps-slider" min="0.01" max="1" step="0.01" value="0.90">
+                <p class="at-hint">Wie gut die Oberfläche Wärme abstrahlt. Typisch 0,90–0,95.</p>
+            </div>
+
+            <div class="at-param">
+                <label for="at-eta">Beaming-Faktor <em>η</em></label>
+                <div class="at-num">
+                    <input type="number" id="at-eta" min="0.1" max="3" step="0.01" value="1.00">
+                    <span class="at-unit">&gt; 0</span>
+                </div>
+                <input type="range" id="at-eta-slider" min="0.1" max="3" step="0.01" value="1.00">
+                <p class="at-hint">Rauigkeits-/Anisotropie-Korrektur. Typisch 0,7–1,4; Standard 1,0.</p>
+            </div>
+
+        </div>
+
+        <hr class="at-divider">
+
+        <div class="at-albedo-wrap">
+            <div class="at-albedo-swatch" id="at-albedo-swatch"></div>
+            <span class="at-albedo-label">Albedo-Vorschau (Helligkeit der Oberfläche)</span>
+        </div>
+
+        <hr class="at-divider">
+
+        <p class="at-albedo-label" style="margin-bottom:0.4rem;">Bekannte Asteroiden</p>
+        <div class="at-presets">
+            <button class="btn btn-sm btn-secondary" data-preset="c">C-Typ</button>
+            <button class="btn btn-sm btn-secondary" data-preset="s">S-Typ</button>
+            <button class="btn btn-sm btn-secondary" data-preset="vesta">Vesta</button>
+            <button class="btn btn-sm btn-secondary" data-preset="eros">Eros</button>
+            <button class="btn btn-sm btn-secondary" data-preset="bennu">Bennu</button>
+            <button class="btn btn-sm btn-secondary" data-preset="ryugu">Ryugu</button>
+            <button class="btn btn-sm btn-secondary" data-preset="neufang">(2183) Neufang</button>
+            <button class="btn btn-sm btn-danger" id="at-reset">Zurücksetzen</button>
+        </div>
+    </div>
+
+    <!-- Rechte Spalte: Ergebnisse + Erklärung -->
+    <div style="display:flex;flex-direction:column;gap:1.25rem;">
+
+        <div class="card">
+            <h2>Temperaturen</h2>
+            <div class="at-results">
+
+                <div>
+                    <div class="at-result-row">
+                        <span class="at-result-label">Gleichgewicht</span>
+                        <span class="at-result-sym">T<sub>eq</sub></span>
+                        <span class="at-result-val" id="at-teq-k">–</span>
+                        <span class="at-result-c" id="at-teq-c"></span>
+                    </div>
+                    <p class="at-hint" style="margin-top:0.25rem;">Isotherme Gleichgewichtstemperatur — globaler Mittelwert über die gesamte Oberfläche.</p>
+                </div>
+
+                <hr class="at-divider">
+
+                <div>
+                    <div class="at-result-row">
+                        <span class="at-result-label">Subsolar</span>
+                        <span class="at-result-sym">T<sub>ss</sub></span>
+                        <span class="at-result-val" id="at-tss-k">–</span>
+                        <span class="at-result-c" id="at-tss-c"></span>
+                    </div>
+                    <p class="at-hint" style="margin-top:0.25rem;">Subsolartemperatur — heißester Punkt direkt unter der Sonne auf der Tagseite.</p>
+                </div>
+
+            </div>
+        </div>
+
+        <div class="card">
+            <h2>Formeln</h2>
+            <table class="data-table">
+                <tr><td>T<sub>eq</sub></td><td>⁴√[ (1−A)·S / (4·ε·σ·η) ]</td></tr>
+                <tr><td>T<sub>ss</sub></td><td>⁴√[ (1−A)·S / (ε·σ·η) ]</td></tr>
+                <tr><td>S</td><td>S₀ / r² &nbsp;mit S₀ = 1361 W/m²</td></tr>
+                <tr><td>σ</td><td>5,670 × 10⁻⁸ W m⁻² K⁻⁴</td></tr>
+            </table>
+            <p class="hint" style="margin-top:0.75rem;">
+                Modell: NEATM (Near-Earth Asteroid Thermal Model).
+                T<sub>ss</sub> = 4<sup>¼</sup> · T<sub>eq</sub> ≈ 1,414 · T<sub>eq</sub>.
+            </p>
+        </div>
+
+    </div>
+</div>
+
+<script>
+(function () {
+    const SIGMA = 5.670374419e-8;
+    const S0    = 1361.0;
+
+    const PRESETS = {
+        default: { r: 1.00,  A: 0.050, eps: 0.90, eta: 1.00 },
+        c:       { r: 2.50,  A: 0.040, eps: 0.90, eta: 1.00 },
+        s:       { r: 2.00,  A: 0.150, eps: 0.90, eta: 1.00 },
+        vesta:   { r: 2.36,  A: 0.200, eps: 0.90, eta: 1.00 },
+        eros:    { r: 1.46,  A: 0.120, eps: 0.90, eta: 1.00 },
+        bennu:   { r: 1.13,  A: 0.020, eps: 0.90, eta: 1.00 },
+        ryugu:   { r: 1.19,  A: 0.020, eps: 0.90, eta: 1.00 },
+        neufang: { r: 3.01,  A: 0.045, eps: 0.90, eta: 1.00 },
+    };
+
+    const numR   = document.getElementById('at-r');
+    const numA   = document.getElementById('at-a');
+    const numEps = document.getElementById('at-eps');
+    const numEta = document.getElementById('at-eta');
+    const sldR   = document.getElementById('at-r-slider');
+    const sldA   = document.getElementById('at-a-slider');
+    const sldEps = document.getElementById('at-eps-slider');
+    const sldEta = document.getElementById('at-eta-slider');
+
+    const outTeqK = document.getElementById('at-teq-k');
+    const outTeqC = document.getElementById('at-teq-c');
+    const outTssK = document.getElementById('at-tss-k');
+    const outTssC = document.getElementById('at-tss-c');
+    const swatch  = document.getElementById('at-albedo-swatch');
+
+    function fmt(val, decimals = 2) {
+        return val.toFixed(decimals).replace('.', ',');
+    }
+
+    function calculate() {
+        const r   = parseFloat(numR.value);
+        const A   = parseFloat(numA.value);
+        const eps = parseFloat(numEps.value);
+        const eta = parseFloat(numEta.value);
+
+        if (!isFinite(r) || r <= 0 || !isFinite(A) || A < 0 || A >= 1 ||
+            !isFinite(eps) || eps <= 0 || !isFinite(eta) || eta <= 0) {
+            outTeqK.textContent = '–';
+            outTeqC.textContent = '';
+            outTssK.textContent = '–';
+            outTssC.textContent = '';
+            return;
+        }
+
+        const S   = S0 / (r * r);
+        const Teq = Math.pow((1 - A) * S / (4.0 * eps * SIGMA * eta), 0.25);
+        const Tss = Math.pow((1 - A) * S / (       eps * SIGMA * eta), 0.25);
+
+        outTeqK.textContent = fmt(Teq, 2) + ' K';
+        outTeqC.textContent = '(' + fmt(Teq - 273.15, 2) + ' °C)';
+        outTssK.textContent = fmt(Tss, 2) + ' K';
+        outTssC.textContent = '(' + fmt(Tss - 273.15, 2) + ' °C)';
+
+        const v = Math.round(Math.min(1, Math.max(0, A)) * 255);
+        swatch.style.background = `rgb(${v},${v},${v})`;
+    }
+
+    function sync(numInput, slider) {
+        numInput.addEventListener('input', () => {
+            slider.value = numInput.value;
+            calculate();
+        });
+        slider.addEventListener('input', () => {
+            numInput.value = slider.value;
+            calculate();
+        });
+    }
+
+    sync(numR,   sldR);
+    sync(numA,   sldA);
+    sync(numEps, sldEps);
+    sync(numEta, sldEta);
+
+    function applyPreset(p) {
+        numR.value   = sldR.value   = p.r;
+        numA.value   = sldA.value   = p.A;
+        numEps.value = sldEps.value = p.eps;
+        numEta.value = sldEta.value = p.eta;
+        calculate();
+    }
+
+    document.querySelectorAll('[data-preset]').forEach(btn => {
+        btn.addEventListener('click', () => {
+            const key = btn.dataset.preset;
+            if (PRESETS[key]) applyPreset(PRESETS[key]);
+        });
+    });
+
+    document.getElementById('at-reset').addEventListener('click', () => {
+        applyPreset(PRESETS.default);
+    });
+
+    calculate();
+})();
+</script>
+
+<?php require __DIR__ . '/footer.php'; ?>
diff --git a/public/auth_helpers.php b/public/auth_helpers.php
index 95b109f..99ed07b 100644
--- a/public/auth_helpers.php
+++ b/public/auth_helpers.php
@@ -134,5 +134,6 @@ function manageablePublicPages(): array
         'moonyear.php' => 'Mondphasen-Jahresübersicht',
         'wochenvorhersage.php' => 'Wochenvorhersage',
         'satellitenhimmel.php' => 'Satellitenhimmel',
+        'asteroid_temp.php' => 'Asteroid-Temperatur',
     ];
 }
diff --git a/public/header.php b/public/header.php
index 7ad7992..6d7d4e8 100644
--- a/public/header.php
+++ b/public/header.php
@@ -153,6 +153,7 @@ $menuGroups = [
             ['href' => 'sternenhimmel.php',         'label' => 'Sternenhimmel'],
             ['href' => 'satellitenhimmel.php',      'label' => 'Satellitenhimmel'],
             ['href' => 'meteorshowers.php',         'label' => 'Meteorströme'],
+            ['href' => 'asteroid_temp.php',         'label' => 'Asteroid-Temperatur'],
             ['href' => 'geocron/index.php',         'label' => 'Geocron'],
             ['href' => 'geocron3d.php',             'label' => 'Geocron 3D'],
             ['href' => 'geocron3d_C.php',           'label' => 'Geocron 3D Cesium'],
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