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
$$
M_a = (11.384 + 2.042\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.384 |
| n |
2.042 |
| gf |
0.811 |
| gb |
-0.979 |
| k |
1.000 |
| δ90 |
1.534 |
| 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) |
| 2026-07-29 00:00 |
08:22:41.92 |
+15:36:38.3 |
HIP 41015 |
11.29 |
| 2026-07-29 12:00 |
08:22:51.14 |
+15:36:03.2 |
HIP 41015 |
12.35 |
| 2026-07-30 00:00 |
08:23:00.35 |
+15:35:28.2 |
HIP 41015 |
13.72 |
| 2026-07-30 12:00 |
08:23:09.56 |
+15:34:53.0 |
HIP 41015 |
15.31 |
| 2026-07-31 00:00 |
08:23:18.77 |
+15:34:17.8 |
HIP 41015 |
17.06 |
| 2026-07-31 12:00 |
08:23:27.97 |
+15:33:42.5 |
HIP 41112 |
17.53 |
| 2026-08-01 00:00 |
08:23:37.16 |
+15:33:07.1 |
HIP 41112 |
17.36 |
| 2026-08-01 12:00 |
08:23:46.35 |
+15:32:31.7 |
HIP 41112 |
17.50 |
| 2026-08-02 00:00 |
08:23:55.52 |
+15:31:56.2 |
HIP 41112 |
17.93 |
| 2026-08-02 12:00 |
08:24:04.70 |
+15:31:20.7 |
HIP 41112 |
18.63 |
| 2026-08-03 00:00 |
08:24:13.86 |
+15:30:45.1 |
HIP 41112 |
19.57 |
| 2026-08-03 12:00 |
08:24:23.01 |
+15:30:09.4 |
HIP 41112 |
20.72 |
| 2026-08-04 00:00 |
08:24:32.16 |
+15:29:33.7 |
HIP 41112 |
22.04 |
| 2026-08-04 12:00 |
08:24:41.29 |
+15:28:57.9 |
HIP 41112 |
23.51 |
| 2026-08-05 00:00 |
08:24:50.42 |
+15:28:22.0 |
HIP 41112 |
25.10 |
| 2026-08-05 12:00 |
08:24:59.54 |
+15:27:46.2 |
HIP 41112 |
26.79 |
| 2026-08-06 00:00 |
08:25:08.64 |
+15:27:10.2 |
HIP 41112 |
28.56 |
| 2026-08-06 12:00 |
08:25:17.74 |
+15:26:34.2 |
HIP 41112 |
30.39 |
| 2026-08-07 00:00 |
08:25:26.82 |
+15:25:58.2 |
HIP 41112 |
32.28 |
| 2026-08-07 12:00 |
08:25:35.89 |
+15:25:22.1 |
HIP 41112 |
34.21 |
| 2026-08-08 00:00 |
08:25:44.95 |
+15:24:45.9 |
HIP 41112 |
36.17 |
| 2026-08-08 12:00 |
08:25:54.00 |
+15:24:09.7 |
HIP 41506 |
34.45 |
| 2026-08-09 00:00 |
08:26:03.03 |
+15:23:33.5 |
HIP 41506 |
32.29 |
| 2026-08-09 12:00 |
08:26:12.05 |
+15:22:57.2 |
HIP 41506 |
30.14 |
| 2026-08-10 00:00 |
08:26:21.06 |
+15:22:20.9 |
HIP 41506 |
28.02 |
| 2026-08-10 12:00 |
08:26:30.05 |
+15:21:44.6 |
HIP 41506 |
25.92 |
| 2026-08-11 00:00 |
08:26:39.03 |
+15:21:08.2 |
HIP 41506 |
23.85 |
| 2026-08-11 12:00 |
08:26:48.00 |
+15:20:31.8 |
HIP 41506 |
21.81 |
| 2026-08-12 00:00 |
08:26:56.94 |
+15:19:55.3 |
HIP 41506 |
19.83 |
| 2026-08-12 12:00 |
08:27:05.87 |
+15:19:18.9 |
HIP 41506 |
17.90 |
| 2026-08-13 00:00 |
08:27:14.79 |
+15:18:42.3 |
HIP 41506 |
16.06 |
| 2026-08-13 12:00 |
08:27:23.68 |
+15:18:05.8 |
HIP 41506 |
14.34 |
| 2026-08-14 00:00 |
08:27:32.56 |
+15:17:29.2 |
HIP 41506 |
12.77 |
| 2026-08-14 12:00 |
08:27:41.43 |
+15:16:52.7 |
HIP 41506 |
11.43 |
| 2026-08-15 00:00 |
08:27:50.27 |
+15:16:16.1 |
HIP 41506 |
10.40 |
| 2026-08-15 12:00 |
08:27:59.09 |
+15:15:39.4 |
HIP 41506 |
9.76 |
| 2026-08-16 00:00 |
08:28:07.90 |
+15:15:02.8 |
HIP 41506 |
9.61 |
| 2026-08-16 12:00 |
08:28:16.68 |
+15:14:26.1 |
HIP 41506 |
9.95 |
| 2026-08-17 00:00 |
08:28:25.45 |
+15:13:49.5 |
HIP 41506 |
10.74 |
| 2026-08-17 12:00 |
08:28:34.19 |
+15:13:12.8 |
HIP 41506 |
11.89 |
| 2026-08-18 00:00 |
08:28:42.92 |
+15:12:36.1 |
HIP 41506 |
13.30 |
| 2026-08-18 12:00 |
08:28:51.62 |
+15:11:59.4 |
HIP 41506 |
14.90 |
| 2026-08-19 00:00 |
08:29:00.30 |
+15:11:22.7 |
HIP 41506 |
16.62 |