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) |
| 2026-03-26 00:00 |
07:59:11.96 |
+16:41:36.4 |
HIP 39046 |
7.67 |
| 2026-03-26 12:00 |
07:59:10.56 |
+16:41:45.0 |
HIP 39046 |
7.59 |
| 2026-03-27 00:00 |
07:59:09.23 |
+16:41:53.5 |
HIP 39046 |
7.54 |
| 2026-03-27 12:00 |
07:59:07.98 |
+16:42:01.8 |
HIP 39046 |
7.49 |
| 2026-03-28 00:00 |
07:59:06.80 |
+16:42:09.9 |
HIP 39046 |
7.46 |
| 2026-03-28 12:00 |
07:59:05.69 |
+16:42:17.8 |
HIP 39046 |
7.43 |
| 2026-03-29 00:00 |
07:59:04.65 |
+16:42:25.5 |
HIP 39046 |
7.42 |
| 2026-03-29 12:00 |
07:59:03.68 |
+16:42:33.0 |
HIP 39046 |
7.40 |
| 2026-03-30 00:00 |
07:59:02.79 |
+16:42:40.3 |
HIP 39046 |
7.40 |
| 2026-03-30 12:00 |
07:59:01.97 |
+16:42:47.5 |
HIP 39046 |
7.39 |
| 2026-03-31 00:00 |
07:59:01.22 |
+16:42:54.4 |
HIP 39046 |
7.39 |
| 2026-03-31 12:00 |
07:59:00.54 |
+16:43:01.2 |
HIP 39046 |
7.38 |
| 2026-04-01 00:00 |
07:58:59.93 |
+16:43:07.7 |
HIP 39046 |
7.37 |
| 2026-04-01 12:00 |
07:58:59.40 |
+16:43:14.1 |
HIP 39046 |
7.36 |
| 2026-04-02 00:00 |
07:58:58.94 |
+16:43:20.3 |
HIP 39046 |
7.35 |
| 2026-04-02 12:00 |
07:58:58.55 |
+16:43:26.3 |
HIP 39046 |
7.33 |
| 2026-04-03 00:00 |
07:58:58.23 |
+16:43:32.1 |
HIP 39046 |
7.30 |
| 2026-04-03 12:00 |
07:58:57.98 |
+16:43:37.7 |
HIP 39046 |
7.27 |
| 2026-04-04 00:00 |
07:58:57.81 |
+16:43:43.1 |
HIP 39046 |
7.23 |
| 2026-04-04 12:00 |
07:58:57.71 |
+16:43:48.3 |
HIP 39046 |
7.18 |
| 2026-04-05 00:00 |
07:58:57.68 |
+16:43:53.3 |
HIP 39046 |
7.12 |
| 2026-04-05 12:00 |
07:58:57.72 |
+16:43:58.1 |
HIP 39046 |
7.06 |
| 2026-04-06 00:00 |
07:58:57.83 |
+16:44:02.7 |
HIP 39046 |
6.98 |
| 2026-04-06 12:00 |
07:58:58.02 |
+16:44:07.1 |
HIP 39046 |
6.90 |
| 2026-04-07 00:00 |
07:58:58.28 |
+16:44:11.3 |
HIP 39046 |
6.80 |
| 2026-04-07 12:00 |
07:58:58.61 |
+16:44:15.3 |
HIP 39046 |
6.70 |
| 2026-04-08 00:00 |
07:58:59.01 |
+16:44:19.1 |
HIP 39046 |
6.59 |
| 2026-04-08 12:00 |
07:58:59.49 |
+16:44:22.7 |
HIP 39046 |
6.47 |
| 2026-04-09 00:00 |
07:59:00.03 |
+16:44:26.1 |
HIP 39046 |
6.34 |
| 2026-04-09 12:00 |
07:59:00.65 |
+16:44:29.3 |
HIP 39046 |
6.20 |
| 2026-04-10 00:00 |
07:59:01.34 |
+16:44:32.4 |
HIP 39046 |
6.05 |
| 2026-04-10 12:00 |
07:59:02.10 |
+16:44:35.2 |
HIP 39046 |
5.90 |
| 2026-04-11 00:00 |
07:59:02.93 |
+16:44:37.8 |
HIP 39046 |
5.74 |
| 2026-04-11 12:00 |
07:59:03.84 |
+16:44:40.1 |
HIP 39046 |
5.58 |
| 2026-04-12 00:00 |
07:59:04.81 |
+16:44:42.3 |
HIP 39046 |
5.41 |
| 2026-04-12 12:00 |
07:59:05.86 |
+16:44:44.3 |
HIP 39046 |
5.24 |
| 2026-04-13 00:00 |
07:59:06.98 |
+16:44:46.1 |
HIP 39046 |
5.08 |
| 2026-04-13 12:00 |
07:59:08.17 |
+16:44:47.7 |
HIP 39046 |
4.92 |
| 2026-04-14 00:00 |
07:59:09.43 |
+16:44:49.0 |
HIP 39046 |
4.76 |
| 2026-04-14 12:00 |
07:59:10.77 |
+16:44:50.2 |
HIP 39046 |
4.62 |
| 2026-04-15 00:00 |
07:59:12.17 |
+16:44:51.1 |
HIP 39046 |
4.50 |
| 2026-04-15 12:00 |
07:59:13.65 |
+16:44:51.9 |
HIP 39046 |
4.39 |
| 2026-04-16 00:00 |
07:59:15.19 |
+16:44:52.4 |
HIP 39046 |
4.32 |