メタデータ
| 項目 |
値 |
| Designation |
C/2012 K1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-08-27T15:50:55.363200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:09Z |
| Obs used |
7829 |
| NEO |
- |
| M1 |
7.300 |
| K1 |
6.750 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2014-02-09.0000000 |
| e |
1.00015292 |
| q (au) |
1.054597 |
| a (au) |
-6896.600671 |
| i (deg) |
142.428258 |
| Ω (om, deg) |
317.737649 |
| ω (w, deg) |
203.106601 |
| M (ma, deg) |
-0.000344 |
等級
散乱 + 全体線形
$$
M_a = (11.414 + 2.385\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.414 |
| n |
2.385 |
| gf |
1.000 |
| gb |
-0.794 |
| 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 |
| 2012-05-14 |
2014-07-17 |
+1.6909 |
-1.293 |
| 2014-08-31 |
2014-10-31 |
+17.6020 |
-4.109 |
| 2014-10-31 |
2016-08-07 |
+3.7225 |
-1.211 |
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) |
| 2026-03-26 00:00 |
21:24:26.61 |
-14:50:55.0 |
HIP 105519 |
31.73 |
| 2026-03-26 12:00 |
21:24:29.24 |
-14:50:40.2 |
HIP 105519 |
32.39 |
| 2026-03-27 00:00 |
21:24:31.84 |
-14:50:25.5 |
HIP 105519 |
33.05 |
| 2026-03-27 12:00 |
21:24:34.42 |
-14:50:10.9 |
HIP 105519 |
33.70 |
| 2026-03-28 00:00 |
21:24:36.97 |
-14:49:56.5 |
HIP 105519 |
34.35 |
| 2026-03-28 12:00 |
21:24:39.49 |
-14:49:42.2 |
HIP 105782 |
34.84 |
| 2026-03-29 00:00 |
21:24:41.99 |
-14:49:27.9 |
HIP 105782 |
34.43 |
| 2026-03-29 12:00 |
21:24:44.47 |
-14:49:13.8 |
HIP 105782 |
34.03 |
| 2026-03-30 00:00 |
21:24:46.91 |
-14:48:59.9 |
HIP 105782 |
33.64 |
| 2026-03-30 12:00 |
21:24:49.33 |
-14:48:46.0 |
HIP 105782 |
33.26 |
| 2026-03-31 00:00 |
21:24:51.73 |
-14:48:32.3 |
HIP 105782 |
32.89 |
| 2026-03-31 12:00 |
21:24:54.10 |
-14:48:18.7 |
HIP 105782 |
32.54 |
| 2026-04-01 00:00 |
21:24:56.44 |
-14:48:05.2 |
HIP 105782 |
32.19 |
| 2026-04-01 12:00 |
21:24:58.75 |
-14:47:51.8 |
HIP 105782 |
31.86 |
| 2026-04-02 00:00 |
21:25:01.03 |
-14:47:38.6 |
HIP 105782 |
31.54 |
| 2026-04-02 12:00 |
21:25:03.29 |
-14:47:25.5 |
HIP 105782 |
31.22 |
| 2026-04-03 00:00 |
21:25:05.52 |
-14:47:12.5 |
HIP 105782 |
30.92 |
| 2026-04-03 12:00 |
21:25:07.73 |
-14:46:59.6 |
HIP 105782 |
30.64 |
| 2026-04-04 00:00 |
21:25:09.90 |
-14:46:46.9 |
HIP 105782 |
30.36 |
| 2026-04-04 12:00 |
21:25:12.05 |
-14:46:34.2 |
HIP 105782 |
30.09 |
| 2026-04-05 00:00 |
21:25:14.17 |
-14:46:21.8 |
HIP 105782 |
29.84 |
| 2026-04-05 12:00 |
21:25:16.26 |
-14:46:09.4 |
HIP 105782 |
29.59 |
| 2026-04-06 00:00 |
21:25:18.32 |
-14:45:57.2 |
HIP 105782 |
29.36 |
| 2026-04-06 12:00 |
21:25:20.35 |
-14:45:45.1 |
HIP 105782 |
29.13 |
| 2026-04-07 00:00 |
21:25:22.36 |
-14:45:33.1 |
HIP 105782 |
28.92 |
| 2026-04-07 12:00 |
21:25:24.33 |
-14:45:21.3 |
HIP 105782 |
28.72 |
| 2026-04-08 00:00 |
21:25:26.28 |
-14:45:09.6 |
HIP 105782 |
28.52 |
| 2026-04-08 12:00 |
21:25:28.20 |
-14:44:58.1 |
HIP 105782 |
28.34 |
| 2026-04-09 00:00 |
21:25:30.08 |
-14:44:46.7 |
HIP 105782 |
28.17 |
| 2026-04-09 12:00 |
21:25:31.94 |
-14:44:35.4 |
HIP 105782 |
28.00 |
| 2026-04-10 00:00 |
21:25:33.77 |
-14:44:24.2 |
HIP 105782 |
27.85 |
| 2026-04-10 12:00 |
21:25:35.56 |
-14:44:13.2 |
HIP 105782 |
27.70 |
| 2026-04-11 00:00 |
21:25:37.33 |
-14:44:02.4 |
HIP 105782 |
27.56 |
| 2026-04-11 12:00 |
21:25:39.07 |
-14:43:51.6 |
HIP 105782 |
27.44 |
| 2026-04-12 00:00 |
21:25:40.78 |
-14:43:41.1 |
HIP 105782 |
27.32 |
| 2026-04-12 12:00 |
21:25:42.45 |
-14:43:30.6 |
HIP 105782 |
27.20 |
| 2026-04-13 00:00 |
21:25:44.10 |
-14:43:20.3 |
HIP 105782 |
27.10 |
| 2026-04-13 12:00 |
21:25:45.71 |
-14:43:10.1 |
HIP 105782 |
27.00 |
| 2026-04-14 00:00 |
21:25:47.29 |
-14:43:00.1 |
HIP 105782 |
26.91 |
| 2026-04-14 12:00 |
21:25:48.84 |
-14:42:50.3 |
HIP 105782 |
26.83 |
| 2026-04-15 00:00 |
21:25:50.36 |
-14:42:40.5 |
HIP 105782 |
26.75 |
| 2026-04-15 12:00 |
21:25:51.85 |
-14:42:31.0 |
HIP 105782 |
26.69 |
| 2026-04-16 00:00 |
21:25:53.31 |
-14:42:21.5 |
HIP 105782 |
26.62 |