メタデータ
| 項目 |
値 |
| Designation |
C/1892 W1 (Brooks) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1893-01-06T23:50:26.018880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:53Z |
| Obs used |
17 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1893-01-08.0000000 |
| e |
1.00000000 |
| q (au) |
1.195109 |
| a (au) |
- |
| i (deg) |
143.849490 |
| Ω (om, deg) |
187.141851 |
| ω (w, deg) |
85.212292 |
| M (ma, deg) |
- |
等級
散乱 + 全体線形
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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) |
| 2026-09-20 00:00 |
20:30:58.62 |
-54:58:40.7 |
HIP 101103 |
14.07 |
| 2026-09-20 12:00 |
20:30:57.78 |
-54:58:36.6 |
HIP 101103 |
14.01 |
| 2026-09-21 00:00 |
20:30:56.94 |
-54:58:32.3 |
HIP 101103 |
13.96 |
| 2026-09-21 12:00 |
20:30:56.11 |
-54:58:28.1 |
HIP 101103 |
13.91 |
| 2026-09-22 00:00 |
20:30:55.29 |
-54:58:23.7 |
HIP 101103 |
13.86 |
| 2026-09-22 12:00 |
20:30:54.48 |
-54:58:19.4 |
HIP 101103 |
13.82 |
| 2026-09-23 00:00 |
20:30:53.68 |
-54:58:14.9 |
HIP 101103 |
13.78 |
| 2026-09-23 12:00 |
20:30:52.89 |
-54:58:10.4 |
HIP 101103 |
13.74 |
| 2026-09-24 00:00 |
20:30:52.11 |
-54:58:05.9 |
HIP 101103 |
13.71 |
| 2026-09-24 12:00 |
20:30:51.34 |
-54:58:01.3 |
HIP 101103 |
13.67 |
| 2026-09-25 00:00 |
20:30:50.58 |
-54:57:56.7 |
HIP 101103 |
13.64 |
| 2026-09-25 12:00 |
20:30:49.83 |
-54:57:52.0 |
HIP 101103 |
13.62 |
| 2026-09-26 00:00 |
20:30:49.08 |
-54:57:47.3 |
HIP 101103 |
13.59 |
| 2026-09-26 12:00 |
20:30:48.35 |
-54:57:42.5 |
HIP 101103 |
13.57 |
| 2026-09-27 00:00 |
20:30:47.63 |
-54:57:37.6 |
HIP 101103 |
13.55 |
| 2026-09-27 12:00 |
20:30:46.92 |
-54:57:32.7 |
HIP 101103 |
13.54 |
| 2026-09-28 00:00 |
20:30:46.22 |
-54:57:27.8 |
HIP 101103 |
13.53 |
| 2026-09-28 12:00 |
20:30:45.53 |
-54:57:22.8 |
HIP 101103 |
13.52 |
| 2026-09-29 00:00 |
20:30:44.85 |
-54:57:17.8 |
HIP 101103 |
13.51 |
| 2026-09-29 12:00 |
20:30:44.18 |
-54:57:12.7 |
HIP 101103 |
13.51 |
| 2026-09-30 00:00 |
20:30:43.52 |
-54:57:07.6 |
HIP 101103 |
13.51 |
| 2026-09-30 12:00 |
20:30:42.87 |
-54:57:02.4 |
HIP 101103 |
13.51 |
| 2026-10-01 00:00 |
20:30:42.23 |
-54:56:57.2 |
HIP 101103 |
13.51 |
| 2026-10-01 12:00 |
20:30:41.60 |
-54:56:51.9 |
HIP 101103 |
13.52 |
| 2026-10-02 00:00 |
20:30:40.98 |
-54:56:46.6 |
HIP 101103 |
13.53 |
| 2026-10-02 12:00 |
20:30:40.37 |
-54:56:41.2 |
HIP 101103 |
13.54 |
| 2026-10-03 00:00 |
20:30:39.78 |
-54:56:35.8 |
HIP 101103 |
13.56 |
| 2026-10-03 12:00 |
20:30:39.19 |
-54:56:30.4 |
HIP 101103 |
13.57 |
| 2026-10-04 00:00 |
20:30:38.62 |
-54:56:24.9 |
HIP 101103 |
13.60 |
| 2026-10-04 12:00 |
20:30:38.05 |
-54:56:19.3 |
HIP 101103 |
13.62 |
| 2026-10-05 00:00 |
20:30:37.50 |
-54:56:13.8 |
HIP 101103 |
13.64 |
| 2026-10-05 12:00 |
20:30:36.95 |
-54:56:08.1 |
HIP 101103 |
13.67 |
| 2026-10-06 00:00 |
20:30:36.42 |
-54:56:02.4 |
HIP 101103 |
13.70 |
| 2026-10-06 12:00 |
20:30:35.90 |
-54:55:56.7 |
HIP 101103 |
13.74 |
| 2026-10-07 00:00 |
20:30:35.39 |
-54:55:51.0 |
HIP 101103 |
13.77 |
| 2026-10-07 12:00 |
20:30:34.89 |
-54:55:45.2 |
HIP 101103 |
13.81 |
| 2026-10-08 00:00 |
20:30:34.40 |
-54:55:39.3 |
HIP 101103 |
13.85 |
| 2026-10-08 12:00 |
20:30:33.93 |
-54:55:33.4 |
HIP 101103 |
13.89 |
| 2026-10-09 00:00 |
20:30:33.46 |
-54:55:27.5 |
HIP 101103 |
13.94 |
| 2026-10-09 12:00 |
20:30:33.01 |
-54:55:21.6 |
HIP 101103 |
13.99 |
| 2026-10-10 00:00 |
20:30:32.56 |
-54:55:15.6 |
HIP 101103 |
14.04 |
| 2026-10-10 12:00 |
20:30:32.13 |
-54:55:09.5 |
HIP 101103 |
14.09 |
| 2026-10-11 00:00 |
20:30:31.71 |
-54:55:03.4 |
HIP 101103 |
14.14 |