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) |
| 2026-05-12 00:00 |
21:26:23.01 |
-14:37:47.1 |
HIP 105782 |
25.40 |
| 2026-05-12 12:00 |
21:26:22.67 |
-14:37:46.1 |
HIP 105782 |
25.34 |
| 2026-05-13 00:00 |
21:26:22.29 |
-14:37:45.3 |
HIP 105782 |
25.28 |
| 2026-05-13 12:00 |
21:26:21.88 |
-14:37:44.7 |
HIP 105782 |
25.21 |
| 2026-05-14 00:00 |
21:26:21.43 |
-14:37:44.2 |
HIP 105782 |
25.15 |
| 2026-05-14 12:00 |
21:26:20.94 |
-14:37:43.9 |
HIP 105782 |
25.08 |
| 2026-05-15 00:00 |
21:26:20.42 |
-14:37:43.7 |
HIP 105782 |
25.01 |
| 2026-05-15 12:00 |
21:26:19.87 |
-14:37:43.8 |
HIP 105782 |
24.94 |
| 2026-05-16 00:00 |
21:26:19.28 |
-14:37:44.0 |
HIP 105782 |
24.86 |
| 2026-05-16 12:00 |
21:26:18.65 |
-14:37:44.3 |
HIP 105782 |
24.79 |
| 2026-05-17 00:00 |
21:26:17.99 |
-14:37:44.9 |
HIP 105782 |
24.71 |
| 2026-05-17 12:00 |
21:26:17.29 |
-14:37:45.6 |
HIP 105782 |
24.63 |
| 2026-05-18 00:00 |
21:26:16.56 |
-14:37:46.5 |
HIP 105782 |
24.56 |
| 2026-05-18 12:00 |
21:26:15.79 |
-14:37:47.5 |
HIP 105782 |
24.48 |
| 2026-05-19 00:00 |
21:26:14.99 |
-14:37:48.7 |
HIP 105782 |
24.40 |
| 2026-05-19 12:00 |
21:26:14.15 |
-14:37:50.1 |
HIP 105782 |
24.32 |
| 2026-05-20 00:00 |
21:26:13.28 |
-14:37:51.6 |
HIP 105782 |
24.24 |
| 2026-05-20 12:00 |
21:26:12.37 |
-14:37:53.3 |
HIP 105782 |
24.16 |
| 2026-05-21 00:00 |
21:26:11.43 |
-14:37:55.2 |
HIP 105782 |
24.08 |
| 2026-05-21 12:00 |
21:26:10.45 |
-14:37:57.2 |
HIP 105782 |
24.00 |
| 2026-05-22 00:00 |
21:26:09.43 |
-14:37:59.5 |
HIP 105782 |
23.92 |
| 2026-05-22 12:00 |
21:26:08.38 |
-14:38:01.8 |
HIP 105782 |
23.84 |
| 2026-05-23 00:00 |
21:26:07.30 |
-14:38:04.4 |
HIP 105782 |
23.76 |
| 2026-05-23 12:00 |
21:26:06.18 |
-14:38:07.1 |
HIP 105782 |
23.69 |
| 2026-05-24 00:00 |
21:26:05.03 |
-14:38:09.9 |
HIP 105782 |
23.62 |
| 2026-05-24 12:00 |
21:26:03.84 |
-14:38:13.0 |
HIP 105782 |
23.55 |
| 2026-05-25 00:00 |
21:26:02.62 |
-14:38:16.1 |
HIP 105782 |
23.48 |
| 2026-05-25 12:00 |
21:26:01.37 |
-14:38:19.5 |
HIP 105782 |
23.41 |
| 2026-05-26 00:00 |
21:26:00.08 |
-14:38:23.0 |
HIP 105782 |
23.35 |
| 2026-05-26 12:00 |
21:25:58.75 |
-14:38:26.7 |
HIP 105782 |
23.29 |
| 2026-05-27 00:00 |
21:25:57.39 |
-14:38:30.5 |
HIP 105782 |
23.24 |
| 2026-05-27 12:00 |
21:25:56.00 |
-14:38:34.6 |
HIP 105782 |
23.19 |
| 2026-05-28 00:00 |
21:25:54.57 |
-14:38:38.7 |
HIP 105782 |
23.15 |
| 2026-05-28 12:00 |
21:25:53.11 |
-14:38:43.0 |
HIP 105782 |
23.11 |
| 2026-05-29 00:00 |
21:25:51.62 |
-14:38:47.5 |
HIP 105782 |
23.08 |
| 2026-05-29 12:00 |
21:25:50.09 |
-14:38:52.2 |
HIP 105782 |
23.05 |
| 2026-05-30 00:00 |
21:25:48.52 |
-14:38:57.0 |
HIP 105782 |
23.03 |
| 2026-05-30 12:00 |
21:25:46.93 |
-14:39:01.9 |
HIP 105782 |
23.02 |
| 2026-05-31 00:00 |
21:25:45.30 |
-14:39:07.1 |
HIP 105782 |
23.01 |
| 2026-05-31 12:00 |
21:25:43.63 |
-14:39:12.4 |
HIP 105782 |
23.02 |
| 2026-06-01 00:00 |
21:25:41.94 |
-14:39:17.8 |
HIP 105782 |
23.03 |
| 2026-06-01 12:00 |
21:25:40.21 |
-14:39:23.4 |
HIP 105782 |
23.05 |
| 2026-06-02 00:00 |
21:25:38.44 |
-14:39:29.2 |
HIP 105782 |
23.08 |