C/2014 Q1 (PANSTARRS)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/2014 Q1 (PANSTARRS) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2015-07-06T12:15:56.439360Z |
| Orbit solution date (soln_date, UTC) | 2021-04-15T23:32:58Z |
| Obs used | 704 |
| NEO | - |
| M1 | 9.700 |
| K1 | 7.250 |
| PC | - |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2015-02-17.0000000 |
| e | 0.99972226 |
| q (au) | 0.314572 |
| a (au) | 1132.604359 |
| i (deg) | 43.106721 |
| Ω (om, deg) | 8.762539 |
| ω (w, deg) | 120.050113 |
| M (ma, deg) | 359.996393 |
等級
散乱 + 全体線形
$$ M_a = (11.191 + 3.199\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 11.191 |
| n | 3.199 |
| gf | 0.996 |
| gb | -0.807 |
| k | 0.944 |
| δ90 | 9.807 |
| 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 |
|---|---|---|---|
| 2014-08-16 | 2015-01-14 | +6.2752 | -4.022 |
| 2015-01-14 | 2015-06-22 | +1.0263 | -1.086 |
| 2015-07-06 | 2015-08-05 | +6.6394 | -2.106 |
| 2015-08-05 | 2015-08-20 | +8.7741 | -1.094 |
| 2015-08-20 | 2016-05-13 | +2.6006 | -0.134 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-09-20 00:00 | 21:15:39.99 | -59:45:18.0 | HIP 104857 | 9.48 |
| 2026-09-20 12:00 | 21:15:34.11 | -59:44:57.3 | HIP 104857 | 8.67 |
| 2026-09-21 00:00 | 21:15:28.28 | -59:44:36.2 | HIP 104857 | 7.87 |
| 2026-09-21 12:00 | 21:15:22.50 | -59:44:14.7 | HIP 104857 | 7.07 |
| 2026-09-22 00:00 | 21:15:16.77 | -59:43:52.9 | HIP 104857 | 6.29 |
| 2026-09-22 12:00 | 21:15:11.10 | -59:43:30.7 | HIP 104857 | 5.52 |
| 2026-09-23 00:00 | 21:15:05.47 | -59:43:08.2 | HIP 104857 | 4.76 |
| 2026-09-23 12:00 | 21:14:59.91 | -59:42:45.3 | HIP 104857 | 4.03 |
| 2026-09-24 00:00 | 21:14:54.39 | -59:42:22.0 | HIP 104857 | 3.33 |
| 2026-09-24 12:00 | 21:14:48.93 | -59:41:58.4 | HIP 104857 | 2.70 |
| 2026-09-25 00:00 | 21:14:43.52 | -59:41:34.4 | HIP 104857 | 2.19 |
| 2026-09-25 12:00 | 21:14:38.17 | -59:41:10.1 | HIP 104857 | 1.89 |
| 2026-09-26 00:00 | 21:14:32.88 | -59:40:45.4 | HIP 104857 | 1.90 |
| 2026-09-26 12:00 | 21:14:27.63 | -59:40:20.4 | HIP 104857 | 2.22 |
| 2026-09-27 00:00 | 21:14:22.45 | -59:39:55.0 | HIP 104857 | 2.73 |
| 2026-09-27 12:00 | 21:14:17.32 | -59:39:29.3 | HIP 104857 | 3.35 |
| 2026-09-28 00:00 | 21:14:12.25 | -59:39:03.2 | HIP 104857 | 4.03 |
| 2026-09-28 12:00 | 21:14:07.23 | -59:38:36.8 | HIP 104857 | 4.73 |
| 2026-09-29 00:00 | 21:14:02.28 | -59:38:10.1 | HIP 104857 | 5.46 |
| 2026-09-29 12:00 | 21:13:57.38 | -59:37:43.0 | HIP 104857 | 6.19 |
| 2026-09-30 00:00 | 21:13:52.54 | -59:37:15.7 | HIP 104857 | 6.93 |
| 2026-09-30 12:00 | 21:13:47.75 | -59:36:47.9 | HIP 104857 | 7.68 |
| 2026-10-01 00:00 | 21:13:43.03 | -59:36:19.9 | HIP 104857 | 8.43 |
| 2026-10-01 12:00 | 21:13:38.36 | -59:35:51.5 | HIP 104857 | 9.17 |
| 2026-10-02 00:00 | 21:13:33.76 | -59:35:22.8 | HIP 104857 | 9.92 |
| 2026-10-02 12:00 | 21:13:29.21 | -59:34:53.8 | HIP 104857 | 10.67 |
| 2026-10-03 00:00 | 21:13:24.72 | -59:34:24.5 | HIP 104857 | 11.41 |
| 2026-10-03 12:00 | 21:13:20.30 | -59:33:54.8 | HIP 104857 | 12.16 |
| 2026-10-04 00:00 | 21:13:15.93 | -59:33:24.9 | HIP 104857 | 12.90 |
| 2026-10-04 12:00 | 21:13:11.63 | -59:32:54.6 | HIP 104857 | 13.65 |
| 2026-10-05 00:00 | 21:13:07.39 | -59:32:24.0 | HIP 104857 | 14.39 |
| 2026-10-05 12:00 | 21:13:03.21 | -59:31:53.2 | HIP 104857 | 15.12 |
| 2026-10-06 00:00 | 21:12:59.09 | -59:31:22.0 | HIP 104857 | 15.86 |
| 2026-10-06 12:00 | 21:12:55.04 | -59:30:50.5 | HIP 104857 | 16.60 |
| 2026-10-07 00:00 | 21:12:51.05 | -59:30:18.7 | HIP 104857 | 17.33 |
| 2026-10-07 12:00 | 21:12:47.12 | -59:29:46.6 | HIP 104857 | 18.06 |
| 2026-10-08 00:00 | 21:12:43.25 | -59:29:14.3 | HIP 104525 | 18.27 |
| 2026-10-08 12:00 | 21:12:39.45 | -59:28:41.6 | HIP 104525 | 17.67 |
| 2026-10-09 00:00 | 21:12:35.71 | -59:28:08.7 | HIP 104525 | 17.08 |
| 2026-10-09 12:00 | 21:12:32.04 | -59:27:35.5 | HIP 104525 | 16.51 |
| 2026-10-10 00:00 | 21:12:28.43 | -59:27:01.9 | HIP 104525 | 15.97 |
| 2026-10-10 12:00 | 21:12:24.89 | -59:26:28.2 | HIP 104525 | 15.44 |
| 2026-10-11 00:00 | 21:12:21.41 | -59:25:54.1 | HIP 104525 | 14.94 |