469P/PANSTARRS
メタデータ
| 項目 | 値 |
|---|---|
| Designation | 469P/PANSTARRS |
| Type | P |
| Perihelion (tp_cal, UTC) | 2016-12-03T09:46:16.360320Z |
| Orbit solution date (soln_date, UTC) | 2025-01-02T20:13:05Z |
| Obs used | 80 |
| NEO | - |
| M1 | 14.800 |
| K1 | 6.750 |
| PC | - |
| Discovery observation (MPC, UTC) | 2015-12-13T15:11:15.648000Z |
| Discovery magnitude (MPC) | 22.40 w |
| Discovery observatory (MPC) | F51 · Pan-STARRS 1, Haleakala |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2015-07-09.0000000 |
| e | 0.31155930 |
| q (au) | 2.984245 |
| a (au) | 4.334789 |
| i (deg) | 20.165485 |
| Ω (om, deg) | 179.032083 |
| ω (w, deg) | 43.960303 |
| M (ma, deg) | 303.932135 |
等級
散乱 + 全体線形
$$ M_a = (12.553 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 12.553 |
| n | 6.000 |
| gf | 1.000 |
| gb | -0.649 |
| k | 0.800 |
| δ90 | 10.000 |
| パラメータ | 記号 | 範囲 | 説明 |
|---|---|---|---|
| 太陽・地球距離が1 AUのときの絶対等級 | H0 | -5 to 20 | 彗星の固有の明るさ |
| 測光スロープパラメータ | n | 2 to 6 | 太陽距離に対する明るさ変化率 |
| 前方散乱非対称係数 | gf |
0.8 to 1 | 前方散乱の強さ |
| 後方散乱非対称係数 | gb |
-1 to -0.5 | 後方散乱の強さ |
| 分配係数 | k | 0.8 to 1 | 前方/後方散乱の寄与比 |
| ダスト/ガス明るさ比 | δ90 | 1 to 10 | ダスト散乱とガス放射の相対寄与 |
参考: EPSC-DPS2025-160
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) | 終了日 (UTC) | a | b |
|---|---|---|---|
| 2015-12-13 | 2016-08-15 | +29.8074 | -15.634 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
ファインディングチャート
天体暦
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-03-26 00:00 | 17:36:43.00 | -02:27:34.2 | HIP 86159 | 7.28 |
| 2026-03-26 12:00 | 17:37:01.58 | -02:23:46.9 | HIP 86159 | 9.68 |
| 2026-03-27 00:00 | 17:37:19.89 | -02:19:58.8 | HIP 86159 | 14.29 |
| 2026-03-27 12:00 | 17:37:37.91 | -02:16:09.9 | HIP 86159 | 19.57 |
| 2026-03-28 00:00 | 17:37:55.65 | -02:12:20.3 | HIP 86159 | 25.07 |
| 2026-03-28 12:00 | 17:38:13.10 | -02:08:30.0 | HIP 86476 | 29.70 |
| 2026-03-29 00:00 | 17:38:30.27 | -02:04:39.0 | HIP 86476 | 25.80 |
| 2026-03-29 12:00 | 17:38:47.15 | -02:00:47.2 | HIP 86476 | 22.77 |
| 2026-03-30 00:00 | 17:39:03.74 | -01:56:54.8 | HIP 86476 | 20.97 |
| 2026-03-30 12:00 | 17:39:20.05 | -01:53:01.7 | HIP 86476 | 20.68 |
| 2026-03-31 00:00 | 17:39:36.06 | -01:49:07.9 | HIP 86476 | 21.92 |
| 2026-03-31 12:00 | 17:39:51.78 | -01:45:13.5 | HIP 86476 | 24.44 |
| 2026-04-01 00:00 | 17:40:07.21 | -01:41:18.5 | HIP 86539 | 22.83 |
| 2026-04-01 12:00 | 17:40:22.35 | -01:37:22.9 | HIP 86539 | 17.40 |
| 2026-04-02 00:00 | 17:40:37.19 | -01:33:26.7 | HIP 86539 | 12.02 |
| 2026-04-02 12:00 | 17:40:51.74 | -01:29:30.0 | HIP 86539 | 6.71 |
| 2026-04-03 00:00 | 17:41:05.99 | -01:25:32.7 | HIP 86539 | 1.78 |
| 2026-04-03 12:00 | 17:41:19.94 | -01:21:34.9 | HIP 86539 | 4.18 |
| 2026-04-04 00:00 | 17:41:33.59 | -01:17:36.6 | HIP 86539 | 9.30 |
| 2026-04-04 12:00 | 17:41:46.94 | -01:13:37.8 | HIP 86539 | 14.46 |
| 2026-04-05 00:00 | 17:42:00.00 | -01:09:38.5 | HIP 86539 | 19.59 |
| 2026-04-05 12:00 | 17:42:12.74 | -01:05:38.8 | HIP 86539 | 24.68 |
| 2026-04-06 00:00 | 17:42:25.19 | -01:01:38.6 | HIP 86582 | 23.93 |
| 2026-04-06 12:00 | 17:42:37.33 | -00:57:38.1 | HIP 86582 | 22.34 |
| 2026-04-07 00:00 | 17:42:49.16 | -00:53:37.2 | HIP 86582 | 21.75 |
| 2026-04-07 12:00 | 17:43:00.69 | -00:49:35.9 | HIP 86582 | 22.22 |
| 2026-04-08 00:00 | 17:43:11.90 | -00:45:34.2 | HIP 86582 | 23.66 |
| 2026-04-08 12:00 | 17:43:22.81 | -00:41:32.3 | HIP 86582 | 25.88 |
| 2026-04-09 00:00 | 17:43:33.41 | -00:37:30.0 | HIP 86582 | 28.68 |
| 2026-04-09 12:00 | 17:43:43.70 | -00:33:27.5 | HIP 86862 | 30.41 |
| 2026-04-10 00:00 | 17:43:53.68 | -00:29:24.8 | HIP 86862 | 25.66 |
| 2026-04-10 12:00 | 17:44:03.34 | -00:25:21.8 | HIP 86862 | 20.95 |
| 2026-04-11 00:00 | 17:44:12.69 | -00:21:18.6 | HIP 86862 | 16.29 |
| 2026-04-11 12:00 | 17:44:21.72 | -00:17:15.3 | HIP 86862 | 11.69 |
| 2026-04-12 00:00 | 17:44:30.44 | -00:13:11.8 | HIP 86862 | 7.20 |
| 2026-04-12 12:00 | 17:44:38.85 | -00:09:08.2 | HIP 86862 | 3.15 |
| 2026-04-13 00:00 | 17:44:46.93 | -00:05:04.5 | HIP 86862 | 3.15 |
| 2026-04-13 12:00 | 17:44:54.70 | -00:01:00.7 | HIP 86862 | 7.14 |
| 2026-04-14 00:00 | 17:45:02.15 | +00:03:03.1 | HIP 86910 | 7.02 |
| 2026-04-14 12:00 | 17:45:09.28 | +00:07:07.0 | HIP 86910 | 5.91 |
| 2026-04-15 00:00 | 17:45:16.09 | +00:11:10.8 | HIP 86910 | 7.77 |
| 2026-04-15 12:00 | 17:45:22.58 | +00:15:14.5 | HIP 86910 | 11.18 |
| 2026-04-16 00:00 | 17:45:28.75 | +00:19:18.2 | HIP 86910 | 15.09 |