メタデータ
| 項目 |
値 |
| Designation |
C/2015 H1 (Bressi) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-03-28T14:52:26.330880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:09Z |
| Obs used |
210 |
| NEO |
- |
| M1 |
4.200 |
| K1 |
40.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-05-27.0000000 |
| e |
0.94079404 |
| q (au) |
1.926359 |
| a (au) |
32.536572 |
| i (deg) |
140.655574 |
| Ω (om, deg) |
325.804456 |
| ω (w, deg) |
21.756727 |
| M (ma, deg) |
0.315347 |
等級
散乱 + 全体線形
$$
M_a = (11.248 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.248 |
| 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 |
| 2015-04-20 |
2015-07-27 |
+16.3060 |
-4.976 |
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) |
| 2026-07-29 00:00 |
10:05:22.47 |
+14:32:04.1 |
HIP 49551 |
33.10 |
| 2026-07-29 12:00 |
10:05:26.28 |
+14:31:38.3 |
HIP 49551 |
32.14 |
| 2026-07-30 00:00 |
10:05:30.10 |
+14:31:12.4 |
HIP 49551 |
31.17 |
| 2026-07-30 12:00 |
10:05:33.94 |
+14:30:46.5 |
HIP 49551 |
30.20 |
| 2026-07-31 00:00 |
10:05:37.79 |
+14:30:20.6 |
HIP 49551 |
29.24 |
| 2026-07-31 12:00 |
10:05:41.66 |
+14:29:54.6 |
HIP 49551 |
28.28 |
| 2026-08-01 00:00 |
10:05:45.53 |
+14:29:28.6 |
HIP 49551 |
27.32 |
| 2026-08-01 12:00 |
10:05:49.42 |
+14:29:02.5 |
HIP 49551 |
26.36 |
| 2026-08-02 00:00 |
10:05:53.32 |
+14:28:36.4 |
HIP 49551 |
25.41 |
| 2026-08-02 12:00 |
10:05:57.23 |
+14:28:10.2 |
HIP 49551 |
24.46 |
| 2026-08-03 00:00 |
10:06:01.15 |
+14:27:44.0 |
HIP 49551 |
23.52 |
| 2026-08-03 12:00 |
10:06:05.09 |
+14:27:17.8 |
HIP 49551 |
22.58 |
| 2026-08-04 00:00 |
10:06:09.03 |
+14:26:51.6 |
HIP 49551 |
21.66 |
| 2026-08-04 12:00 |
10:06:12.99 |
+14:26:25.3 |
HIP 49551 |
20.74 |
| 2026-08-05 00:00 |
10:06:16.95 |
+14:25:58.9 |
HIP 49551 |
19.83 |
| 2026-08-05 12:00 |
10:06:20.93 |
+14:25:32.6 |
HIP 49551 |
18.94 |
| 2026-08-06 00:00 |
10:06:24.91 |
+14:25:06.2 |
HIP 49551 |
18.07 |
| 2026-08-06 12:00 |
10:06:28.90 |
+14:24:39.8 |
HIP 49551 |
17.21 |
| 2026-08-07 00:00 |
10:06:32.91 |
+14:24:13.4 |
HIP 49551 |
16.38 |
| 2026-08-07 12:00 |
10:06:36.92 |
+14:23:46.9 |
HIP 49551 |
15.57 |
| 2026-08-08 00:00 |
10:06:40.94 |
+14:23:20.4 |
HIP 49551 |
14.80 |
| 2026-08-08 12:00 |
10:06:44.97 |
+14:22:53.9 |
HIP 49551 |
14.06 |
| 2026-08-09 00:00 |
10:06:49.00 |
+14:22:27.4 |
HIP 49551 |
13.37 |
| 2026-08-09 12:00 |
10:06:53.05 |
+14:22:00.8 |
HIP 49551 |
12.73 |
| 2026-08-10 00:00 |
10:06:57.10 |
+14:21:34.2 |
HIP 49551 |
12.16 |
| 2026-08-10 12:00 |
10:07:01.16 |
+14:21:07.7 |
HIP 49551 |
11.65 |
| 2026-08-11 00:00 |
10:07:05.23 |
+14:20:41.1 |
HIP 49551 |
11.22 |
| 2026-08-11 12:00 |
10:07:09.30 |
+14:20:14.5 |
HIP 49551 |
10.89 |
| 2026-08-12 00:00 |
10:07:13.38 |
+14:19:47.8 |
HIP 49551 |
10.65 |
| 2026-08-12 12:00 |
10:07:17.46 |
+14:19:21.2 |
HIP 49551 |
10.53 |
| 2026-08-13 00:00 |
10:07:21.55 |
+14:18:54.6 |
HIP 49551 |
10.51 |
| 2026-08-13 12:00 |
10:07:25.65 |
+14:18:27.9 |
HIP 49551 |
10.61 |
| 2026-08-14 00:00 |
10:07:29.75 |
+14:18:01.3 |
HIP 49551 |
10.81 |
| 2026-08-14 12:00 |
10:07:33.85 |
+14:17:34.7 |
HIP 49551 |
11.12 |
| 2026-08-15 00:00 |
10:07:37.96 |
+14:17:08.0 |
HIP 49551 |
11.53 |
| 2026-08-15 12:00 |
10:07:42.08 |
+14:16:41.4 |
HIP 49551 |
12.02 |
| 2026-08-16 00:00 |
10:07:46.19 |
+14:16:14.7 |
HIP 49551 |
12.59 |
| 2026-08-16 12:00 |
10:07:50.31 |
+14:15:48.1 |
HIP 49551 |
13.22 |
| 2026-08-17 00:00 |
10:07:54.44 |
+14:15:21.5 |
HIP 49551 |
13.92 |
| 2026-08-17 12:00 |
10:07:58.56 |
+14:14:54.9 |
HIP 49551 |
14.66 |
| 2026-08-18 00:00 |
10:08:02.69 |
+14:14:28.3 |
HIP 49551 |
15.45 |
| 2026-08-18 12:00 |
10:08:06.83 |
+14:14:01.7 |
HIP 49551 |
16.27 |
| 2026-08-19 00:00 |
10:08:10.96 |
+14:13:35.1 |
HIP 49551 |
17.12 |