C/2016 Q4 (Kowalski)
メタデータ
| 項目 |
値 |
| Designation |
C/2016 Q4 (Kowalski) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2018-01-28T02:33:30.335040Z |
| Orbit solution date (soln_date, UTC) |
2023-05-30T09:33:32Z |
| Obs used |
80 |
| NEO |
- |
| M1 |
12.100 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2017-02-13.0000000 |
| e |
0.57828825 |
| q (au) |
7.084079 |
| a (au) |
16.798390 |
| i (deg) |
7.256882 |
| Ω (om, deg) |
271.330245 |
| ω (w, deg) |
99.469482 |
| M (ma, deg) |
355.002410 |
等級
散乱 + 全体線形
$$
M_a = (11.380 + 2.036\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.380 |
| n |
2.036 |
| gf |
0.812 |
| gb |
-0.979 |
| k |
1.000 |
| δ90 |
1.625 |
| 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 |
08:06:59.02 |
+16:14:38.9 |
HIP 39812 |
19.31 |
| 2026-02-03 12:00 |
08:06:52.15 |
+16:14:58.8 |
HIP 39812 |
20.56 |
| 2026-02-04 00:00 |
08:06:45.31 |
+16:15:18.6 |
HIP 39812 |
21.85 |
| 2026-02-04 12:00 |
08:06:38.48 |
+16:15:38.5 |
HIP 39812 |
23.20 |
| 2026-02-05 00:00 |
08:06:31.69 |
+16:15:58.3 |
HIP 39812 |
24.57 |
| 2026-02-05 12:00 |
08:06:24.92 |
+16:16:18.1 |
HIP 39812 |
25.98 |
| 2026-02-06 00:00 |
08:06:18.17 |
+16:16:37.9 |
HIP 39812 |
27.40 |
| 2026-02-06 12:00 |
08:06:11.45 |
+16:16:57.7 |
HIP 39812 |
28.85 |
| 2026-02-07 00:00 |
08:06:04.76 |
+16:17:17.5 |
HIP 39812 |
30.30 |
| 2026-02-07 12:00 |
08:05:58.10 |
+16:17:37.2 |
HIP 39812 |
31.77 |
| 2026-02-08 00:00 |
08:05:51.47 |
+16:17:57.0 |
HIP 39812 |
33.25 |
| 2026-02-08 12:00 |
08:05:44.87 |
+16:18:16.7 |
HIP 39460 |
33.20 |
| 2026-02-09 00:00 |
08:05:38.30 |
+16:18:36.3 |
HIP 39460 |
31.76 |
| 2026-02-09 12:00 |
08:05:31.76 |
+16:18:56.0 |
HIP 39460 |
30.35 |
| 2026-02-10 00:00 |
08:05:25.26 |
+16:19:15.6 |
HIP 39460 |
28.97 |
| 2026-02-10 12:00 |
08:05:18.78 |
+16:19:35.1 |
HIP 39460 |
27.61 |
| 2026-02-11 00:00 |
08:05:12.35 |
+16:19:54.6 |
HIP 39460 |
26.28 |
| 2026-02-11 12:00 |
08:05:05.94 |
+16:20:14.1 |
HIP 39460 |
25.00 |
| 2026-02-12 00:00 |
08:04:59.57 |
+16:20:33.5 |
HIP 39460 |
23.75 |
| 2026-02-12 12:00 |
08:04:53.24 |
+16:20:52.9 |
HIP 39460 |
22.54 |
| 2026-02-13 00:00 |
08:04:46.95 |
+16:21:12.3 |
HIP 39460 |
21.39 |
| 2026-02-13 12:00 |
08:04:40.69 |
+16:21:31.6 |
HIP 39460 |
20.29 |
| 2026-02-14 00:00 |
08:04:34.47 |
+16:21:50.8 |
HIP 39460 |
19.26 |
| 2026-02-14 12:00 |
08:04:28.30 |
+16:22:10.0 |
HIP 39460 |
18.30 |
| 2026-02-15 00:00 |
08:04:22.16 |
+16:22:29.1 |
HIP 39460 |
17.42 |
| 2026-02-15 12:00 |
08:04:16.06 |
+16:22:48.1 |
HIP 39460 |
16.64 |
| 2026-02-16 00:00 |
08:04:10.00 |
+16:23:07.1 |
HIP 39460 |
15.97 |
| 2026-02-16 12:00 |
08:04:03.99 |
+16:23:26.0 |
HIP 39460 |
15.41 |
| 2026-02-17 00:00 |
08:03:58.02 |
+16:23:44.9 |
HIP 39460 |
14.98 |
| 2026-02-17 12:00 |
08:03:52.09 |
+16:24:03.7 |
HIP 39460 |
14.68 |
| 2026-02-18 00:00 |
08:03:46.20 |
+16:24:22.4 |
HIP 39460 |
14.53 |
| 2026-02-18 12:00 |
08:03:40.37 |
+16:24:41.0 |
HIP 39460 |
14.51 |
| 2026-02-19 00:00 |
08:03:34.57 |
+16:24:59.6 |
HIP 39460 |
14.63 |
| 2026-02-19 12:00 |
08:03:28.83 |
+16:25:18.1 |
HIP 39460 |
14.89 |
| 2026-02-20 00:00 |
08:03:23.13 |
+16:25:36.5 |
HIP 39460 |
15.27 |
| 2026-02-20 12:00 |
08:03:17.47 |
+16:25:54.8 |
HIP 39460 |
15.75 |
| 2026-02-21 00:00 |
08:03:11.87 |
+16:26:13.0 |
HIP 39460 |
16.34 |
| 2026-02-21 12:00 |
08:03:06.32 |
+16:26:31.1 |
HIP 39460 |
17.01 |
| 2026-02-22 00:00 |
08:03:00.81 |
+16:26:49.2 |
HIP 39460 |
17.75 |
| 2026-02-22 12:00 |
08:02:55.35 |
+16:27:07.1 |
HIP 39460 |
18.55 |
| 2026-02-23 00:00 |
08:02:49.95 |
+16:27:25.0 |
HIP 39236 |
19.10 |
| 2026-02-23 12:00 |
08:02:44.60 |
+16:27:42.7 |
HIP 39236 |
17.82 |
| 2026-02-24 00:00 |
08:02:39.29 |
+16:28:00.4 |
HIP 39236 |
16.56 |