C/2015 K7 (COIAS)
メタデータ
| 項目 |
値 |
| Designation |
C/2015 K7 (COIAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-02-19T19:51:17.665920Z |
| Orbit solution date (soln_date, UTC) |
2024-12-23T14:42:02Z |
| Obs used |
59 |
| NEO |
- |
| M1 |
7.400 |
| K1 |
10.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2015-05-17T09:45:54.432000Z |
| Discovery magnitude (MPC) |
23.40 g |
| Discovery observatory (MPC) |
T09 · Subaru Telescope, Maunakea |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2014-08-27.0000000 |
| e |
1.00398018 |
| q (au) |
9.940926 |
| a (au) |
-2497.604954 |
| i (deg) |
159.939165 |
| Ω (om, deg) |
258.001127 |
| ω (w, deg) |
5.158803 |
| M (ma, deg) |
0.004368 |
等級
散乱 + 全体線形
$$
M_a = (5.609 + 4.567\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
5.609 |
| n |
4.567 |
| gf |
0.937 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
5.810 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
10:43:52.44 |
+29:36:25.7 |
HIP 52569 |
14.61 |
| 2026-02-03 12:00 |
10:43:46.65 |
+29:37:05.3 |
HIP 52442 |
15.97 |
| 2026-02-04 00:00 |
10:43:40.83 |
+29:37:44.8 |
HIP 52442 |
16.00 |
| 2026-02-04 12:00 |
10:43:34.99 |
+29:38:24.1 |
HIP 52442 |
16.16 |
| 2026-02-05 00:00 |
10:43:29.14 |
+29:39:03.3 |
HIP 52442 |
16.44 |
| 2026-02-05 12:00 |
10:43:23.26 |
+29:39:42.3 |
HIP 52442 |
16.83 |
| 2026-02-06 00:00 |
10:43:17.36 |
+29:40:21.2 |
HIP 52442 |
17.32 |
| 2026-02-06 12:00 |
10:43:11.44 |
+29:41:00.0 |
HIP 52442 |
17.92 |
| 2026-02-07 00:00 |
10:43:05.51 |
+29:41:38.6 |
HIP 52406 |
18.47 |
| 2026-02-07 12:00 |
10:42:59.55 |
+29:42:17.0 |
HIP 52406 |
18.79 |
| 2026-02-08 00:00 |
10:42:53.58 |
+29:42:55.3 |
HIP 52406 |
19.20 |
| 2026-02-08 12:00 |
10:42:47.59 |
+29:43:33.5 |
HIP 52406 |
19.71 |
| 2026-02-09 00:00 |
10:42:41.58 |
+29:44:11.4 |
HIP 52406 |
20.31 |
| 2026-02-09 12:00 |
10:42:35.56 |
+29:44:49.2 |
HIP 52406 |
20.99 |
| 2026-02-10 00:00 |
10:42:29.52 |
+29:45:26.8 |
HIP 52406 |
21.74 |
| 2026-02-10 12:00 |
10:42:23.47 |
+29:46:04.3 |
HIP 52406 |
22.56 |
| 2026-02-11 00:00 |
10:42:17.39 |
+29:46:41.5 |
HIP 52406 |
23.44 |
| 2026-02-11 12:00 |
10:42:11.31 |
+29:47:18.6 |
HIP 52406 |
24.37 |
| 2026-02-12 00:00 |
10:42:05.21 |
+29:47:55.5 |
HIP 52406 |
25.35 |
| 2026-02-12 12:00 |
10:41:59.09 |
+29:48:32.3 |
HIP 52406 |
26.38 |
| 2026-02-13 00:00 |
10:41:52.97 |
+29:49:08.8 |
HIP 52275 |
26.07 |
| 2026-02-13 12:00 |
10:41:46.83 |
+29:49:45.1 |
HIP 52275 |
24.92 |
| 2026-02-14 00:00 |
10:41:40.67 |
+29:50:21.3 |
HIP 52275 |
23.81 |
| 2026-02-14 12:00 |
10:41:34.51 |
+29:50:57.2 |
HIP 52275 |
22.74 |
| 2026-02-15 00:00 |
10:41:28.33 |
+29:51:32.9 |
HIP 52275 |
21.71 |
| 2026-02-15 12:00 |
10:41:22.14 |
+29:52:08.5 |
HIP 52275 |
20.75 |
| 2026-02-16 00:00 |
10:41:15.95 |
+29:52:43.8 |
HIP 52192 |
19.40 |
| 2026-02-16 12:00 |
10:41:09.74 |
+29:53:18.9 |
HIP 52192 |
18.05 |
| 2026-02-17 00:00 |
10:41:03.52 |
+29:53:53.8 |
HIP 52192 |
16.71 |
| 2026-02-17 12:00 |
10:40:57.29 |
+29:54:28.5 |
HIP 52192 |
15.39 |
| 2026-02-18 00:00 |
10:40:51.05 |
+29:55:02.9 |
HIP 52192 |
14.11 |
| 2026-02-18 12:00 |
10:40:44.81 |
+29:55:37.2 |
HIP 52192 |
12.86 |
| 2026-02-19 00:00 |
10:40:38.56 |
+29:56:11.2 |
HIP 52192 |
11.66 |
| 2026-02-19 12:00 |
10:40:32.30 |
+29:56:45.0 |
HIP 52192 |
10.53 |
| 2026-02-20 00:00 |
10:40:26.03 |
+29:57:18.5 |
HIP 52192 |
9.48 |
| 2026-02-20 12:00 |
10:40:19.76 |
+29:57:51.9 |
HIP 52192 |
8.56 |
| 2026-02-21 00:00 |
10:40:13.49 |
+29:58:25.0 |
HIP 52192 |
7.80 |
| 2026-02-21 12:00 |
10:40:07.20 |
+29:58:57.8 |
HIP 52192 |
7.26 |
| 2026-02-22 00:00 |
10:40:00.92 |
+29:59:30.4 |
HIP 52192 |
6.99 |
| 2026-02-22 12:00 |
10:39:54.63 |
+30:00:02.8 |
HIP 52192 |
7.02 |
| 2026-02-23 00:00 |
10:39:48.33 |
+30:00:34.9 |
HIP 52192 |
7.34 |
| 2026-02-23 12:00 |
10:39:42.03 |
+30:01:06.7 |
HIP 52192 |
7.92 |
| 2026-02-24 00:00 |
10:39:35.73 |
+30:01:38.4 |
HIP 52192 |
8.70 |