メタデータ
| 項目 |
値 |
| Designation |
104P/Kowal 2 |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2022-01-11T14:49:09.753600Z |
| Orbit solution date (soln_date, UTC) |
2023-04-05T03:16:58Z |
| Obs used |
1551 |
| NEO |
Yes |
| M1 |
14.600 |
| K1 |
12.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2021-09-29.0000000 |
| e |
0.66545272 |
| q (au) |
1.073098 |
| a (au) |
3.207614 |
| i (deg) |
5.701090 |
| Ω (om, deg) |
207.213526 |
| ω (w, deg) |
227.245888 |
| M (ma, deg) |
342.051208 |
等級
散乱 + 全体線形
$$
M_a = (13.882 + 3.137\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.882 |
| n |
3.137 |
| gf |
1.000 |
| gb |
-0.998 |
| k |
1.000 |
| 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 |
| 2021-08-11 |
2021-11-29 |
+3.2064 |
+1.741 |
| 2021-11-29 |
2022-01-11 |
+71.5132 |
-3.914 |
| 2022-01-11 |
2022-07-20 |
-2.8823 |
-1.387 |
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) |
| 2026-06-01 00:00 |
19:36:44.97 |
-14:39:27.2 |
HIP 96506 |
14.97 |
| 2026-06-01 12:00 |
19:36:31.79 |
-14:39:13.6 |
HIP 96506 |
16.39 |
| 2026-06-02 00:00 |
19:36:18.35 |
-14:39:00.8 |
HIP 96506 |
18.31 |
| 2026-06-02 12:00 |
19:36:04.67 |
-14:38:48.7 |
HIP 96506 |
20.62 |
| 2026-06-03 00:00 |
19:35:50.74 |
-14:38:37.3 |
HIP 96506 |
23.24 |
| 2026-06-03 12:00 |
19:35:36.56 |
-14:38:26.7 |
HIP 96506 |
26.09 |
| 2026-06-04 00:00 |
19:35:22.14 |
-14:38:16.8 |
HIP 96506 |
29.13 |
| 2026-06-04 12:00 |
19:35:07.47 |
-14:38:07.6 |
HIP 96506 |
32.32 |
| 2026-06-05 00:00 |
19:34:52.56 |
-14:37:59.2 |
HIP 96169 |
32.53 |
| 2026-06-05 12:00 |
19:34:37.40 |
-14:37:51.5 |
HIP 96169 |
30.08 |
| 2026-06-06 00:00 |
19:34:22.01 |
-14:37:44.5 |
HIP 96169 |
27.86 |
| 2026-06-06 12:00 |
19:34:06.37 |
-14:37:38.3 |
HIP 96169 |
25.95 |
| 2026-06-07 00:00 |
19:33:50.49 |
-14:37:32.9 |
HIP 96169 |
24.44 |
| 2026-06-07 12:00 |
19:33:34.38 |
-14:37:28.1 |
HIP 96169 |
23.45 |
| 2026-06-08 00:00 |
19:33:18.02 |
-14:37:24.2 |
HIP 96105 |
22.65 |
| 2026-06-08 12:00 |
19:33:01.44 |
-14:37:20.9 |
HIP 96105 |
20.62 |
| 2026-06-09 00:00 |
19:32:44.61 |
-14:37:18.4 |
HIP 96105 |
19.19 |
| 2026-06-09 12:00 |
19:32:27.55 |
-14:37:16.7 |
HIP 96105 |
18.55 |
| 2026-06-10 00:00 |
19:32:10.27 |
-14:37:15.7 |
HIP 95974 |
17.78 |
| 2026-06-10 12:00 |
19:31:52.75 |
-14:37:15.4 |
HIP 95974 |
13.64 |
| 2026-06-11 00:00 |
19:31:35.00 |
-14:37:15.9 |
HIP 95974 |
9.56 |
| 2026-06-11 12:00 |
19:31:17.02 |
-14:37:17.2 |
HIP 95974 |
5.74 |
| 2026-06-12 00:00 |
19:30:58.82 |
-14:37:19.1 |
HIP 95974 |
3.53 |
| 2026-06-12 12:00 |
19:30:40.40 |
-14:37:21.9 |
HIP 95974 |
5.59 |
| 2026-06-13 00:00 |
19:30:21.75 |
-14:37:25.3 |
HIP 95974 |
9.53 |
| 2026-06-13 12:00 |
19:30:02.89 |
-14:37:29.5 |
HIP 95974 |
13.88 |
| 2026-06-14 00:00 |
19:29:43.81 |
-14:37:34.5 |
HIP 95974 |
18.39 |
| 2026-06-14 12:00 |
19:29:24.51 |
-14:37:40.2 |
HIP 95974 |
22.99 |
| 2026-06-15 00:00 |
19:29:05.00 |
-14:37:46.6 |
HIP 95974 |
27.67 |
| 2026-06-15 12:00 |
19:28:45.29 |
-14:37:53.8 |
HIP 95755 |
28.34 |
| 2026-06-16 00:00 |
19:28:25.36 |
-14:38:01.7 |
HIP 95755 |
28.21 |
| 2026-06-16 12:00 |
19:28:05.23 |
-14:38:10.3 |
HIP 95574 |
24.89 |
| 2026-06-17 00:00 |
19:27:44.89 |
-14:38:19.6 |
HIP 95574 |
20.14 |
| 2026-06-17 12:00 |
19:27:24.36 |
-14:38:29.7 |
HIP 95574 |
15.45 |
| 2026-06-18 00:00 |
19:27:03.63 |
-14:38:40.5 |
HIP 95574 |
10.99 |
| 2026-06-18 12:00 |
19:26:42.71 |
-14:38:52.0 |
HIP 95574 |
7.27 |
| 2026-06-19 00:00 |
19:26:21.59 |
-14:39:04.2 |
HIP 95574 |
6.04 |
| 2026-06-19 12:00 |
19:26:00.29 |
-14:39:17.1 |
HIP 95574 |
8.55 |
| 2026-06-20 00:00 |
19:25:38.80 |
-14:39:30.7 |
HIP 95488 |
8.79 |
| 2026-06-20 12:00 |
19:25:17.13 |
-14:39:45.1 |
HIP 95488 |
8.34 |
| 2026-06-21 00:00 |
19:24:55.28 |
-14:40:00.1 |
HIP 95488 |
10.84 |
| 2026-06-21 12:00 |
19:24:33.26 |
-14:40:15.8 |
HIP 95488 |
14.93 |
| 2026-06-22 00:00 |
19:24:11.06 |
-14:40:32.1 |
HIP 95488 |
19.66 |