メタデータ
| 項目 |
値 |
| Designation |
C/2017 S6 (Catalina) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2018-02-26T22:22:53.693760Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:35Z |
| Obs used |
247 |
| NEO |
- |
| M1 |
15.300 |
| K1 |
4.750 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2017-11-15.0000000 |
| e |
1.00140730 |
| q (au) |
1.542930 |
| a (au) |
-1096.375698 |
| i (deg) |
152.826812 |
| Ω (om, deg) |
130.873122 |
| ω (w, deg) |
134.685410 |
| M (ma, deg) |
-0.002822 |
等級
散乱 + 全体線形
$$
M_a = (17.010 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
17.010 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.676 |
| 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 |
| 2017-02-16 |
2017-10-28 |
+4.8973 |
-2.493 |
| 2017-10-28 |
2018-02-05 |
+7.2164 |
-2.343 |
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 |
12:45:40.73 |
-32:30:10.0 |
HIP 62485 |
34.84 |
| 2026-09-20 12:00 |
12:45:45.78 |
-32:30:23.9 |
HIP 62485 |
33.90 |
| 2026-09-21 00:00 |
12:45:50.83 |
-32:30:38.2 |
HIP 62485 |
32.97 |
| 2026-09-21 12:00 |
12:45:55.89 |
-32:30:52.9 |
HIP 62485 |
32.05 |
| 2026-09-22 00:00 |
12:46:00.96 |
-32:31:07.8 |
HIP 62485 |
31.15 |
| 2026-09-22 12:00 |
12:46:06.04 |
-32:31:23.1 |
HIP 62485 |
30.25 |
| 2026-09-23 00:00 |
12:46:11.13 |
-32:31:38.7 |
HIP 62485 |
29.37 |
| 2026-09-23 12:00 |
12:46:16.23 |
-32:31:54.7 |
HIP 62485 |
28.51 |
| 2026-09-24 00:00 |
12:46:21.34 |
-32:32:10.9 |
HIP 62485 |
27.67 |
| 2026-09-24 12:00 |
12:46:26.46 |
-32:32:27.5 |
HIP 62485 |
26.85 |
| 2026-09-25 00:00 |
12:46:31.58 |
-32:32:44.4 |
HIP 62485 |
26.05 |
| 2026-09-25 12:00 |
12:46:36.71 |
-32:33:01.7 |
HIP 62485 |
25.28 |
| 2026-09-26 00:00 |
12:46:41.84 |
-32:33:19.2 |
HIP 62485 |
24.53 |
| 2026-09-26 12:00 |
12:46:46.99 |
-32:33:37.1 |
HIP 62485 |
23.82 |
| 2026-09-27 00:00 |
12:46:52.14 |
-32:33:55.3 |
HIP 62485 |
23.14 |
| 2026-09-27 12:00 |
12:46:57.29 |
-32:34:13.8 |
HIP 62485 |
22.50 |
| 2026-09-28 00:00 |
12:47:02.45 |
-32:34:32.6 |
HIP 62485 |
21.90 |
| 2026-09-28 12:00 |
12:47:07.62 |
-32:34:51.7 |
HIP 62485 |
21.35 |
| 2026-09-29 00:00 |
12:47:12.79 |
-32:35:11.2 |
HIP 62485 |
20.85 |
| 2026-09-29 12:00 |
12:47:17.97 |
-32:35:30.9 |
HIP 62485 |
20.41 |
| 2026-09-30 00:00 |
12:47:23.15 |
-32:35:50.9 |
HIP 62485 |
20.02 |
| 2026-09-30 12:00 |
12:47:28.33 |
-32:36:11.3 |
HIP 62485 |
19.70 |
| 2026-10-01 00:00 |
12:47:33.52 |
-32:36:32.0 |
HIP 62485 |
19.45 |
| 2026-10-01 12:00 |
12:47:38.71 |
-32:36:52.9 |
HIP 62485 |
19.26 |
| 2026-10-02 00:00 |
12:47:43.90 |
-32:37:14.2 |
HIP 62485 |
19.14 |
| 2026-10-02 12:00 |
12:47:49.10 |
-32:37:35.8 |
HIP 62485 |
19.10 |
| 2026-10-03 00:00 |
12:47:54.30 |
-32:37:57.6 |
HIP 62485 |
19.13 |
| 2026-10-03 12:00 |
12:47:59.50 |
-32:38:19.8 |
HIP 62485 |
19.24 |
| 2026-10-04 00:00 |
12:48:04.70 |
-32:38:42.3 |
HIP 62485 |
19.42 |
| 2026-10-04 12:00 |
12:48:09.91 |
-32:39:05.0 |
HIP 62485 |
19.67 |
| 2026-10-05 00:00 |
12:48:15.11 |
-32:39:28.1 |
HIP 62485 |
19.99 |
| 2026-10-05 12:00 |
12:48:20.32 |
-32:39:51.4 |
HIP 62485 |
20.38 |
| 2026-10-06 00:00 |
12:48:25.53 |
-32:40:15.1 |
HIP 62485 |
20.83 |
| 2026-10-06 12:00 |
12:48:30.73 |
-32:40:39.0 |
HIP 62485 |
21.34 |
| 2026-10-07 00:00 |
12:48:35.94 |
-32:41:03.2 |
HIP 62485 |
21.91 |
| 2026-10-07 12:00 |
12:48:41.14 |
-32:41:27.7 |
HIP 62485 |
22.52 |
| 2026-10-08 00:00 |
12:48:46.34 |
-32:41:52.5 |
HIP 62485 |
23.18 |
| 2026-10-08 12:00 |
12:48:51.55 |
-32:42:17.5 |
HIP 62485 |
23.89 |
| 2026-10-09 00:00 |
12:48:56.75 |
-32:42:42.9 |
HIP 62485 |
24.64 |
| 2026-10-09 12:00 |
12:49:01.94 |
-32:43:08.5 |
HIP 62485 |
25.42 |
| 2026-10-10 00:00 |
12:49:07.14 |
-32:43:34.4 |
HIP 62485 |
26.24 |
| 2026-10-10 12:00 |
12:49:12.33 |
-32:44:00.5 |
HIP 62485 |
27.08 |
| 2026-10-11 00:00 |
12:49:17.51 |
-32:44:27.0 |
HIP 62481 |
27.72 |