メタデータ
| 項目 |
値 |
| Designation |
268P/Bernardi |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-04-26T21:23:12.413760Z |
| Orbit solution date (soln_date, UTC) |
2026-04-27T13:42:34Z |
| Obs used |
218 |
| NEO |
- |
| M1 |
17.200 |
| 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) |
2016-08-31.0000000 |
| e |
0.46979297 |
| q (au) |
2.418605 |
| a (au) |
4.561624 |
| i (deg) |
16.096802 |
| Ω (om, deg) |
127.628210 |
| ω (w, deg) |
0.311064 |
| M (ma, deg) |
49.783578 |
等級
散乱 + 全体線形
$$
M_a = (16.702 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
16.702 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.806 |
| k |
0.998 |
| 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
15:43:12.90 |
-06:59:31.3 |
HIP 76865 |
39.39 |
| 2026-09-20 12:00 |
15:43:34.03 |
-07:02:01.8 |
HIP 76916 |
41.98 |
| 2026-09-21 00:00 |
15:43:55.26 |
-07:04:32.1 |
HIP 76916 |
42.47 |
| 2026-09-21 12:00 |
15:44:16.60 |
-07:07:02.1 |
HIP 76916 |
43.76 |
| 2026-09-22 00:00 |
15:44:38.03 |
-07:09:31.7 |
HIP 77313 |
40.30 |
| 2026-09-22 12:00 |
15:44:59.57 |
-07:12:01.1 |
HIP 77313 |
34.41 |
| 2026-09-23 00:00 |
15:45:21.21 |
-07:14:30.1 |
HIP 77313 |
28.50 |
| 2026-09-23 12:00 |
15:45:42.94 |
-07:16:58.7 |
HIP 77313 |
22.58 |
| 2026-09-24 00:00 |
15:46:04.78 |
-07:19:27.1 |
HIP 77313 |
16.64 |
| 2026-09-24 12:00 |
15:46:26.71 |
-07:21:55.1 |
HIP 77313 |
10.70 |
| 2026-09-25 00:00 |
15:46:48.73 |
-07:24:22.7 |
HIP 77313 |
4.83 |
| 2026-09-25 12:00 |
15:47:10.85 |
-07:26:50.1 |
HIP 77313 |
2.01 |
| 2026-09-26 00:00 |
15:47:33.07 |
-07:29:17.0 |
HIP 77313 |
7.56 |
| 2026-09-26 12:00 |
15:47:55.38 |
-07:31:43.6 |
HIP 77313 |
13.55 |
| 2026-09-27 00:00 |
15:48:17.79 |
-07:34:09.9 |
HIP 77313 |
19.59 |
| 2026-09-27 12:00 |
15:48:40.28 |
-07:36:35.8 |
HIP 77461 |
21.58 |
| 2026-09-28 00:00 |
15:49:02.87 |
-07:39:01.3 |
HIP 77461 |
18.96 |
| 2026-09-28 12:00 |
15:49:25.55 |
-07:41:26.5 |
HIP 77461 |
18.11 |
| 2026-09-29 00:00 |
15:49:48.32 |
-07:43:51.3 |
HIP 77461 |
19.28 |
| 2026-09-29 12:00 |
15:50:11.18 |
-07:46:15.7 |
HIP 77461 |
22.18 |
| 2026-09-30 00:00 |
15:50:34.13 |
-07:48:39.7 |
HIP 77699 |
23.40 |
| 2026-09-30 12:00 |
15:50:57.16 |
-07:51:03.4 |
HIP 77699 |
17.45 |
| 2026-10-01 00:00 |
15:51:20.29 |
-07:53:26.7 |
HIP 77699 |
11.75 |
| 2026-10-01 12:00 |
15:51:43.50 |
-07:55:49.6 |
HIP 77699 |
6.97 |
| 2026-10-02 00:00 |
15:52:06.80 |
-07:58:12.1 |
HIP 77699 |
6.05 |
| 2026-10-02 12:00 |
15:52:30.18 |
-08:00:34.2 |
HIP 77699 |
10.15 |
| 2026-10-03 00:00 |
15:52:53.65 |
-08:02:55.8 |
HIP 77699 |
15.76 |
| 2026-10-03 12:00 |
15:53:17.20 |
-08:05:17.1 |
HIP 77699 |
21.75 |
| 2026-10-04 00:00 |
15:53:40.84 |
-08:07:38.0 |
HIP 77699 |
27.89 |
| 2026-10-04 12:00 |
15:54:04.56 |
-08:09:58.5 |
HIP 77883 |
25.13 |
| 2026-10-05 00:00 |
15:54:28.36 |
-08:12:18.5 |
HIP 77883 |
22.61 |
| 2026-10-05 12:00 |
15:54:52.25 |
-08:14:38.2 |
HIP 77883 |
21.72 |
| 2026-10-06 00:00 |
15:55:16.22 |
-08:16:57.4 |
HIP 77883 |
22.66 |
| 2026-10-06 12:00 |
15:55:40.26 |
-08:19:16.2 |
HIP 78003 |
19.59 |
| 2026-10-07 00:00 |
15:56:04.39 |
-08:21:34.5 |
HIP 78003 |
18.12 |
| 2026-10-07 12:00 |
15:56:28.59 |
-08:23:52.4 |
HIP 78003 |
18.85 |
| 2026-10-08 00:00 |
15:56:52.88 |
-08:26:09.9 |
HIP 78003 |
21.58 |
| 2026-10-08 12:00 |
15:57:17.24 |
-08:28:26.9 |
HIP 78003 |
25.68 |
| 2026-10-09 00:00 |
15:57:41.67 |
-08:30:43.5 |
HIP 78296 |
26.15 |
| 2026-10-09 12:00 |
15:58:06.19 |
-08:32:59.6 |
HIP 78296 |
19.76 |
| 2026-10-10 00:00 |
15:58:30.77 |
-08:35:15.2 |
HIP 78296 |
13.43 |
| 2026-10-10 12:00 |
15:58:55.44 |
-08:37:30.4 |
HIP 78296 |
7.38 |
| 2026-10-11 00:00 |
15:59:20.17 |
-08:39:45.1 |
HIP 78296 |
3.61 |