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) |
|---|---|---|---|---|
| 2026-02-03 00:00 | 16:44:40.68 | -07:08:54.5 | HIP 81994 | 5.76 |
| 2026-02-03 12:00 | 16:45:20.57 | -07:07:22.6 | HIP 81994 | 5.16 |
| 2026-02-04 00:00 | 16:46:00.34 | -07:05:49.1 | HIP 81994 | 14.82 |
| 2026-02-04 12:00 | 16:46:39.96 | -07:04:14.0 | HIP 81994 | 24.71 |
| 2026-02-05 00:00 | 16:47:19.45 | -07:02:37.3 | HIP 81994 | 34.61 |
| 2026-02-05 12:00 | 16:47:58.80 | -07:00:59.0 | HIP 81994 | 44.49 |
| 2026-02-06 00:00 | 16:48:38.00 | -06:59:19.2 | HIP 82406 | 38.34 |
| 2026-02-06 12:00 | 16:49:17.06 | -06:57:37.7 | HIP 82406 | 34.01 |
| 2026-02-07 00:00 | 16:49:55.98 | -06:55:54.7 | HIP 82406 | 32.24 |
| 2026-02-07 12:00 | 16:50:34.76 | -06:54:10.1 | HIP 82406 | 33.40 |
| 2026-02-08 00:00 | 16:51:13.39 | -06:52:23.9 | HIP 82406 | 37.20 |
| 2026-02-08 12:00 | 16:51:51.87 | -06:50:36.1 | HIP 82699 | 37.11 |
| 2026-02-09 00:00 | 16:52:30.20 | -06:48:46.7 | HIP 82699 | 27.43 |
| 2026-02-09 12:00 | 16:53:08.37 | -06:46:55.8 | HIP 82699 | 17.78 |
| 2026-02-10 00:00 | 16:53:46.40 | -06:45:03.2 | HIP 82699 | 8.17 |
| 2026-02-10 12:00 | 16:54:24.27 | -06:43:09.1 | HIP 82699 | 1.64 |
| 2026-02-11 00:00 | 16:55:01.99 | -06:41:13.5 | HIP 82790 | 2.62 |
| 2026-02-11 12:00 | 16:55:39.55 | -06:39:16.2 | HIP 82790 | 7.86 |
| 2026-02-12 00:00 | 16:56:16.95 | -06:37:17.4 | HIP 82790 | 17.23 |
| 2026-02-12 12:00 | 16:56:54.19 | -06:35:17.0 | HIP 82790 | 26.66 |
| 2026-02-13 00:00 | 16:57:31.26 | -06:33:15.1 | HIP 82790 | 36.07 |
| 2026-02-13 12:00 | 16:58:08.18 | -06:31:11.6 | HIP 82845 | 41.95 |
| 2026-02-14 00:00 | 16:58:44.93 | -06:29:06.5 | HIP 83145 | 41.10 |
| 2026-02-14 12:00 | 16:59:21.51 | -06:27:00.0 | HIP 83311 | 37.31 |
| 2026-02-15 00:00 | 16:59:57.93 | -06:24:51.8 | HIP 83311 | 30.87 |
| 2026-02-15 12:00 | 17:00:34.17 | -06:22:42.1 | HIP 83311 | 26.25 |
| 2026-02-16 00:00 | 17:01:10.25 | -06:20:30.8 | HIP 83311 | 24.45 |
| 2026-02-16 12:00 | 17:01:46.15 | -06:18:18.1 | HIP 83414 | 18.00 |
| 2026-02-17 00:00 | 17:02:21.87 | -06:16:03.8 | HIP 83414 | 10.24 |
| 2026-02-17 12:00 | 17:02:57.43 | -06:13:47.9 | HIP 83414 | 7.34 |
| 2026-02-18 00:00 | 17:03:32.80 | -06:11:30.6 | HIP 83414 | 13.00 |
| 2026-02-18 12:00 | 17:04:08.00 | -06:09:11.7 | HIP 83405 | 20.13 |
| 2026-02-19 00:00 | 17:04:43.01 | -06:06:51.3 | HIP 83676 | 21.43 |
| 2026-02-19 12:00 | 17:05:17.84 | -06:04:29.4 | HIP 83676 | 13.70 |
| 2026-02-20 00:00 | 17:05:52.50 | -06:02:06.0 | HIP 83676 | 8.84 |
| 2026-02-20 12:00 | 17:06:26.96 | -05:59:41.1 | HIP 83676 | 11.34 |
| 2026-02-21 00:00 | 17:07:01.24 | -05:57:14.8 | HIP 83676 | 18.35 |
| 2026-02-21 12:00 | 17:07:35.33 | -05:54:46.9 | HIP 83676 | 26.48 |
| 2026-02-22 00:00 | 17:08:09.24 | -05:52:17.6 | HIP 83890 | 32.45 |
| 2026-02-22 12:00 | 17:08:42.95 | -05:49:46.8 | HIP 83890 | 33.74 |
| 2026-02-23 00:00 | 17:09:16.47 | -05:47:14.5 | HIP 84046 | 29.36 |
| 2026-02-23 12:00 | 17:09:49.80 | -05:44:40.8 | HIP 84046 | 21.08 |
| 2026-02-24 00:00 | 17:10:22.94 | -05:42:05.7 | HIP 84046 | 13.33 |