37P/Forbes
メタデータ
| 項目 |
値 |
| Designation |
37P/Forbes |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-05-04T04:20:40.490880Z |
| Orbit solution date (soln_date, UTC) |
2025-11-23T22:22:59Z |
| Obs used |
1737 |
| NEO |
- |
| M1 |
9.600 |
| K1 |
21.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2019-07-09.0000000 |
| e |
0.53418886 |
| q (au) |
1.610684 |
| a (au) |
3.457805 |
| i (deg) |
8.956078 |
| Ω (om, deg) |
314.577863 |
| ω (w, deg) |
330.024671 |
| M (ma, deg) |
66.038643 |
等級
散乱 + 全体線形
$$
M_a = (10.398 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.398 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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 |
| 2024-02-05 |
2024-10-07 |
+32.4582 |
-8.642 |
| 2024-10-07 |
2024-04-20 |
-1.5202 |
+0.726 |
| 2024-04-20 |
2025-01-05 |
+15.9337 |
-5.687 |
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) |
| 2026-02-03 00:00 |
02:28:29.92 |
+24:07:49.5 |
HIP 11547 |
16.14 |
| 2026-02-03 12:00 |
02:28:46.98 |
+24:07:51.5 |
HIP 11547 |
15.63 |
| 2026-02-04 00:00 |
02:29:04.23 |
+24:07:54.7 |
HIP 11547 |
16.11 |
| 2026-02-04 12:00 |
02:29:21.68 |
+24:07:59.0 |
HIP 11547 |
17.52 |
| 2026-02-05 00:00 |
02:29:39.32 |
+24:08:04.5 |
HIP 11547 |
19.69 |
| 2026-02-05 12:00 |
02:29:57.14 |
+24:08:11.2 |
HIP 11547 |
22.43 |
| 2026-02-06 00:00 |
02:30:15.15 |
+24:08:19.0 |
HIP 11547 |
25.57 |
| 2026-02-06 12:00 |
02:30:33.34 |
+24:08:28.0 |
HIP 11547 |
29.00 |
| 2026-02-07 00:00 |
02:30:51.72 |
+24:08:38.1 |
HIP 11547 |
32.65 |
| 2026-02-07 12:00 |
02:31:10.28 |
+24:08:49.3 |
HIP 11547 |
36.46 |
| 2026-02-08 00:00 |
02:31:29.02 |
+24:09:01.7 |
HIP 11547 |
40.40 |
| 2026-02-08 12:00 |
02:31:47.93 |
+24:09:15.1 |
HIP 11547 |
44.45 |
| 2026-02-09 00:00 |
02:32:07.03 |
+24:09:29.6 |
HIP 11547 |
48.60 |
| 2026-02-09 12:00 |
02:32:26.30 |
+24:09:45.3 |
HIP 11976 |
48.56 |
| 2026-02-10 00:00 |
02:32:45.75 |
+24:10:02.0 |
HIP 11976 |
46.38 |
| 2026-02-10 12:00 |
02:33:05.37 |
+24:10:19.7 |
HIP 11976 |
44.54 |
| 2026-02-11 00:00 |
02:33:25.17 |
+24:10:38.6 |
HIP 11976 |
43.10 |
| 2026-02-11 12:00 |
02:33:45.13 |
+24:10:58.4 |
HIP 11976 |
42.10 |
| 2026-02-12 00:00 |
02:34:05.27 |
+24:11:19.3 |
HIP 11976 |
41.60 |
| 2026-02-12 12:00 |
02:34:25.57 |
+24:11:41.3 |
HIP 11976 |
41.62 |
| 2026-02-13 00:00 |
02:34:46.04 |
+24:12:04.3 |
HIP 12184 |
40.20 |
| 2026-02-13 12:00 |
02:35:06.68 |
+24:12:28.2 |
HIP 12184 |
36.55 |
| 2026-02-14 00:00 |
02:35:27.48 |
+24:12:53.2 |
HIP 12184 |
33.12 |
| 2026-02-14 12:00 |
02:35:48.44 |
+24:13:19.2 |
HIP 12184 |
30.03 |
| 2026-02-15 00:00 |
02:36:09.57 |
+24:13:46.2 |
HIP 12184 |
27.40 |
| 2026-02-15 12:00 |
02:36:30.86 |
+24:14:14.1 |
HIP 12184 |
25.39 |
| 2026-02-16 00:00 |
02:36:52.30 |
+24:14:43.0 |
HIP 12189 |
24.19 |
| 2026-02-16 12:00 |
02:37:13.90 |
+24:15:12.9 |
HIP 12189 |
23.82 |
| 2026-02-17 00:00 |
02:37:35.66 |
+24:15:43.7 |
HIP 12367 |
22.25 |
| 2026-02-17 12:00 |
02:37:57.58 |
+24:16:15.4 |
HIP 12367 |
17.24 |
| 2026-02-18 00:00 |
02:38:19.65 |
+24:16:48.1 |
HIP 12367 |
12.20 |
| 2026-02-18 12:00 |
02:38:41.87 |
+24:17:21.7 |
HIP 12367 |
7.13 |
| 2026-02-19 00:00 |
02:39:04.24 |
+24:17:56.2 |
HIP 12367 |
2.19 |
| 2026-02-19 12:00 |
02:39:26.76 |
+24:18:31.5 |
HIP 12367 |
3.39 |
| 2026-02-20 00:00 |
02:39:49.43 |
+24:19:07.8 |
HIP 12367 |
8.49 |
| 2026-02-20 12:00 |
02:40:12.24 |
+24:19:45.0 |
HIP 12367 |
13.70 |
| 2026-02-21 00:00 |
02:40:35.20 |
+24:20:23.0 |
HIP 12367 |
18.96 |
| 2026-02-21 12:00 |
02:40:58.31 |
+24:21:01.8 |
HIP 12532 |
22.68 |
| 2026-02-22 00:00 |
02:41:21.55 |
+24:21:41.6 |
HIP 12532 |
21.77 |
| 2026-02-22 12:00 |
02:41:44.94 |
+24:22:22.1 |
HIP 12532 |
22.15 |
| 2026-02-23 00:00 |
02:42:08.47 |
+24:23:03.5 |
HIP 12532 |
23.76 |
| 2026-02-23 12:00 |
02:42:32.13 |
+24:23:45.6 |
HIP 12730 |
24.52 |
| 2026-02-24 00:00 |
02:42:55.93 |
+24:24:28.6 |
HIP 12730 |
22.27 |