C/2017 K6 (Jacques)
メタデータ
| 項目 |
値 |
| Designation |
C/2017 K6 (Jacques) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2018-01-03T03:16:30.506880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:34Z |
| Obs used |
475 |
| NEO |
- |
| M1 |
12.100 |
| K1 |
6.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2018-02-05.0000000 |
| e |
0.99822114 |
| q (au) |
2.002756 |
| a (au) |
1125.867222 |
| i (deg) |
57.251183 |
| Ω (om, deg) |
85.054187 |
| ω (w, deg) |
303.838384 |
| M (ma, deg) |
0.000857 |
等級
散乱 + 全体線形
$$
M_a = (10.455 + 4.414\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.455 |
| n |
4.414 |
| gf |
1.000 |
| gb |
-0.891 |
| k |
0.984 |
| 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 |
| 2017-05-29 |
2017-09-21 |
-1.7754 |
+1.104 |
| 2017-09-21 |
2017-12-30 |
+16.2254 |
-5.376 |
| 2018-01-05 |
2019-02-14 |
+1.6841 |
-1.364 |
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) |
| 2026-02-03 00:00 |
13:58:59.28 |
+53:46:55.3 |
HIP 68271 |
12.66 |
| 2026-02-03 12:00 |
13:58:57.98 |
+53:48:11.1 |
HIP 68196 |
12.81 |
| 2026-02-04 00:00 |
13:58:56.59 |
+53:49:26.8 |
HIP 68196 |
12.04 |
| 2026-02-04 12:00 |
13:58:55.13 |
+53:50:42.5 |
HIP 68196 |
11.35 |
| 2026-02-05 00:00 |
13:58:53.58 |
+53:51:58.2 |
HIP 68196 |
10.75 |
| 2026-02-05 12:00 |
13:58:51.96 |
+53:53:13.7 |
HIP 68196 |
10.28 |
| 2026-02-06 00:00 |
13:58:50.25 |
+53:54:29.3 |
HIP 68196 |
9.93 |
| 2026-02-06 12:00 |
13:58:48.46 |
+53:55:44.7 |
HIP 68196 |
9.73 |
| 2026-02-07 00:00 |
13:58:46.59 |
+53:57:00.1 |
HIP 68196 |
9.69 |
| 2026-02-07 12:00 |
13:58:44.64 |
+53:58:15.3 |
HIP 68196 |
9.80 |
| 2026-02-08 00:00 |
13:58:42.61 |
+53:59:30.5 |
HIP 68332 |
9.82 |
| 2026-02-08 12:00 |
13:58:40.51 |
+54:00:45.6 |
HIP 68332 |
8.95 |
| 2026-02-09 00:00 |
13:58:38.32 |
+54:02:00.6 |
HIP 68332 |
8.19 |
| 2026-02-09 12:00 |
13:58:36.05 |
+54:03:15.4 |
HIP 68332 |
7.59 |
| 2026-02-10 00:00 |
13:58:33.70 |
+54:04:30.1 |
HIP 68332 |
7.19 |
| 2026-02-10 12:00 |
13:58:31.27 |
+54:05:44.7 |
HIP 68332 |
7.02 |
| 2026-02-11 00:00 |
13:58:28.76 |
+54:06:59.2 |
HIP 68332 |
7.09 |
| 2026-02-11 12:00 |
13:58:26.17 |
+54:08:13.5 |
HIP 68332 |
7.40 |
| 2026-02-12 00:00 |
13:58:23.50 |
+54:09:27.7 |
HIP 68332 |
7.93 |
| 2026-02-12 12:00 |
13:58:20.75 |
+54:10:41.7 |
HIP 68332 |
8.63 |
| 2026-02-13 00:00 |
13:58:17.92 |
+54:11:55.6 |
HIP 68332 |
9.47 |
| 2026-02-13 12:00 |
13:58:15.01 |
+54:13:09.3 |
HIP 68332 |
10.41 |
| 2026-02-14 00:00 |
13:58:12.03 |
+54:14:22.8 |
HIP 68332 |
11.43 |
| 2026-02-14 12:00 |
13:58:08.96 |
+54:15:36.1 |
HIP 68332 |
12.51 |
| 2026-02-15 00:00 |
13:58:05.82 |
+54:16:49.2 |
HIP 68332 |
13.63 |
| 2026-02-15 12:00 |
13:58:02.60 |
+54:18:02.2 |
HIP 68332 |
14.79 |
| 2026-02-16 00:00 |
13:57:59.30 |
+54:19:14.9 |
HIP 68332 |
15.98 |
| 2026-02-16 12:00 |
13:57:55.92 |
+54:20:27.4 |
HIP 68138 |
16.80 |
| 2026-02-17 00:00 |
13:57:52.46 |
+54:21:39.7 |
HIP 68138 |
15.50 |
| 2026-02-17 12:00 |
13:57:48.93 |
+54:22:51.8 |
HIP 68138 |
14.20 |
| 2026-02-18 00:00 |
13:57:45.32 |
+54:24:03.6 |
HIP 68138 |
12.91 |
| 2026-02-18 12:00 |
13:57:41.63 |
+54:25:15.2 |
HIP 68138 |
11.61 |
| 2026-02-19 00:00 |
13:57:37.87 |
+54:26:26.5 |
HIP 68138 |
10.31 |
| 2026-02-19 12:00 |
13:57:34.03 |
+54:27:37.6 |
HIP 68138 |
9.01 |
| 2026-02-20 00:00 |
13:57:30.12 |
+54:28:48.4 |
HIP 68138 |
7.71 |
| 2026-02-20 12:00 |
13:57:26.13 |
+54:29:59.0 |
HIP 68138 |
6.42 |
| 2026-02-21 00:00 |
13:57:22.06 |
+54:31:09.3 |
HIP 68138 |
5.13 |
| 2026-02-21 12:00 |
13:57:17.92 |
+54:32:19.3 |
HIP 68138 |
3.86 |
| 2026-02-22 00:00 |
13:57:13.71 |
+54:33:29.0 |
HIP 68138 |
2.61 |
| 2026-02-22 12:00 |
13:57:09.42 |
+54:34:38.4 |
HIP 68138 |
1.48 |
| 2026-02-23 00:00 |
13:57:05.06 |
+54:35:47.5 |
HIP 68138 |
0.99 |
| 2026-02-23 12:00 |
13:57:00.62 |
+54:36:56.2 |
HIP 68138 |
1.79 |
| 2026-02-24 00:00 |
13:56:56.11 |
+54:38:04.7 |
HIP 68138 |
2.98 |