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) |
| 2026-06-01 00:00 |
08:06:08.53 |
+16:30:41.9 |
HIP 39812 |
28.94 |
| 2026-06-01 12:00 |
08:06:15.52 |
+16:30:23.2 |
HIP 39812 |
27.24 |
| 2026-06-02 00:00 |
08:06:22.56 |
+16:30:04.3 |
HIP 39812 |
25.52 |
| 2026-06-02 12:00 |
08:06:29.63 |
+16:29:45.2 |
HIP 39812 |
23.80 |
| 2026-06-03 00:00 |
08:06:36.75 |
+16:29:25.9 |
HIP 39812 |
22.06 |
| 2026-06-03 12:00 |
08:06:43.91 |
+16:29:06.4 |
HIP 39812 |
20.31 |
| 2026-06-04 00:00 |
08:06:51.12 |
+16:28:46.7 |
HIP 39812 |
18.56 |
| 2026-06-04 12:00 |
08:06:58.36 |
+16:28:26.9 |
HIP 39812 |
16.79 |
| 2026-06-05 00:00 |
08:07:05.64 |
+16:28:06.8 |
HIP 39812 |
15.01 |
| 2026-06-05 12:00 |
08:07:12.96 |
+16:27:46.6 |
HIP 39812 |
13.23 |
| 2026-06-06 00:00 |
08:07:20.33 |
+16:27:26.2 |
HIP 39812 |
11.43 |
| 2026-06-06 12:00 |
08:07:27.73 |
+16:27:05.6 |
HIP 39812 |
9.62 |
| 2026-06-07 00:00 |
08:07:35.17 |
+16:26:44.8 |
HIP 39812 |
7.80 |
| 2026-06-07 12:00 |
08:07:42.65 |
+16:26:23.8 |
HIP 39812 |
5.98 |
| 2026-06-08 00:00 |
08:07:50.17 |
+16:26:02.7 |
HIP 39812 |
4.14 |
| 2026-06-08 12:00 |
08:07:57.72 |
+16:25:41.3 |
HIP 39812 |
2.30 |
| 2026-06-09 00:00 |
08:08:05.31 |
+16:25:19.8 |
HIP 39812 |
0.49 |
| 2026-06-09 12:00 |
08:08:12.94 |
+16:24:58.1 |
HIP 39812 |
1.45 |
| 2026-06-10 00:00 |
08:08:20.61 |
+16:24:36.2 |
HIP 39812 |
3.31 |
| 2026-06-10 12:00 |
08:08:28.31 |
+16:24:14.1 |
HIP 39812 |
5.19 |
| 2026-06-11 00:00 |
08:08:36.05 |
+16:23:51.9 |
HIP 39812 |
7.08 |
| 2026-06-11 12:00 |
08:08:43.83 |
+16:23:29.5 |
HIP 39812 |
8.98 |
| 2026-06-12 00:00 |
08:08:51.63 |
+16:23:06.8 |
HIP 39812 |
10.89 |
| 2026-06-12 12:00 |
08:08:59.48 |
+16:22:44.1 |
HIP 39812 |
12.81 |
| 2026-06-13 00:00 |
08:09:07.36 |
+16:22:21.1 |
HIP 39812 |
14.74 |
| 2026-06-13 12:00 |
08:09:15.27 |
+16:21:57.9 |
HIP 39812 |
16.68 |
| 2026-06-14 00:00 |
08:09:23.22 |
+16:21:34.6 |
HIP 39812 |
18.62 |
| 2026-06-14 12:00 |
08:09:31.19 |
+16:21:11.1 |
HIP 39812 |
20.58 |
| 2026-06-15 00:00 |
08:09:39.21 |
+16:20:47.4 |
HIP 39812 |
22.54 |
| 2026-06-15 12:00 |
08:09:47.25 |
+16:20:23.6 |
HIP 39812 |
24.51 |
| 2026-06-16 00:00 |
08:09:55.32 |
+16:19:59.6 |
HIP 40115 |
25.31 |
| 2026-06-16 12:00 |
08:10:03.43 |
+16:19:35.4 |
HIP 40115 |
23.33 |
| 2026-06-17 00:00 |
08:10:11.57 |
+16:19:11.0 |
HIP 40115 |
21.34 |
| 2026-06-17 12:00 |
08:10:19.74 |
+16:18:46.5 |
HIP 40115 |
19.35 |
| 2026-06-18 00:00 |
08:10:27.93 |
+16:18:21.8 |
HIP 40115 |
17.35 |
| 2026-06-18 12:00 |
08:10:36.16 |
+16:17:56.9 |
HIP 40115 |
15.34 |
| 2026-06-19 00:00 |
08:10:44.42 |
+16:17:31.9 |
HIP 40115 |
13.33 |
| 2026-06-19 12:00 |
08:10:52.70 |
+16:17:06.6 |
HIP 40115 |
11.32 |
| 2026-06-20 00:00 |
08:11:01.01 |
+16:16:41.3 |
HIP 40115 |
9.31 |
| 2026-06-20 12:00 |
08:11:09.35 |
+16:16:15.7 |
HIP 40115 |
7.31 |
| 2026-06-21 00:00 |
08:11:17.72 |
+16:15:50.0 |
HIP 40115 |
5.34 |
| 2026-06-21 12:00 |
08:11:26.11 |
+16:15:24.2 |
HIP 40115 |
3.46 |
| 2026-06-22 00:00 |
08:11:34.53 |
+16:14:58.2 |
HIP 40115 |
1.98 |