メタデータ
| 項目 |
値 |
| Designation |
C/1966 P2 (Barbon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1966-04-17T18:42:45.604800Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:17Z |
| Obs used |
90 |
| NEO |
- |
| M1 |
5.600 |
| K1 |
11.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1966-09-13.0000000 |
| e |
0.99811001 |
| q (au) |
2.018741 |
| a (au) |
1068.123028 |
| i (deg) |
28.707616 |
| Ω (om, deg) |
167.689319 |
| ω (w, deg) |
136.165961 |
| M (ma, deg) |
0.004185 |
等級
散乱 + 全体線形
$$
M_a = (4.104 + 4.736\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
4.104 |
| n |
4.736 |
| gf |
1.000 |
| gb |
-1.000 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
07:08:37.54 |
-02:25:57.1 |
HIP 34494 |
16.61 |
| 2026-05-12 12:00 |
07:08:38.37 |
-02:25:51.0 |
HIP 34494 |
16.67 |
| 2026-05-13 00:00 |
07:08:39.20 |
-02:25:45.0 |
HIP 34494 |
16.73 |
| 2026-05-13 12:00 |
07:08:40.04 |
-02:25:39.1 |
HIP 34494 |
16.79 |
| 2026-05-14 00:00 |
07:08:40.90 |
-02:25:33.2 |
HIP 34494 |
16.85 |
| 2026-05-14 12:00 |
07:08:41.76 |
-02:25:27.4 |
HIP 34494 |
16.92 |
| 2026-05-15 00:00 |
07:08:42.63 |
-02:25:21.6 |
HIP 34494 |
16.98 |
| 2026-05-15 12:00 |
07:08:43.51 |
-02:25:16.0 |
HIP 34494 |
17.05 |
| 2026-05-16 00:00 |
07:08:44.40 |
-02:25:10.3 |
HIP 34494 |
17.12 |
| 2026-05-16 12:00 |
07:08:45.30 |
-02:25:04.8 |
HIP 34494 |
17.20 |
| 2026-05-17 00:00 |
07:08:46.21 |
-02:24:59.3 |
HIP 34494 |
17.27 |
| 2026-05-17 12:00 |
07:08:47.13 |
-02:24:53.8 |
HIP 34494 |
17.35 |
| 2026-05-18 00:00 |
07:08:48.06 |
-02:24:48.4 |
HIP 34494 |
17.42 |
| 2026-05-18 12:00 |
07:08:48.99 |
-02:24:43.1 |
HIP 34494 |
17.50 |
| 2026-05-19 00:00 |
07:08:49.94 |
-02:24:37.9 |
HIP 34494 |
17.59 |
| 2026-05-19 12:00 |
07:08:50.89 |
-02:24:32.7 |
HIP 34494 |
17.67 |
| 2026-05-20 00:00 |
07:08:51.85 |
-02:24:27.6 |
HIP 34494 |
17.76 |
| 2026-05-20 12:00 |
07:08:52.82 |
-02:24:22.5 |
HIP 34494 |
17.85 |
| 2026-05-21 00:00 |
07:08:53.80 |
-02:24:17.6 |
HIP 34494 |
17.94 |
| 2026-05-21 12:00 |
07:08:54.78 |
-02:24:12.7 |
HIP 34494 |
18.03 |
| 2026-05-22 00:00 |
07:08:55.78 |
-02:24:07.8 |
HIP 34494 |
18.12 |
| 2026-05-22 12:00 |
07:08:56.78 |
-02:24:03.0 |
HIP 34494 |
18.22 |
| 2026-05-23 00:00 |
07:08:57.79 |
-02:23:58.3 |
HIP 34494 |
18.32 |
| 2026-05-23 12:00 |
07:08:58.81 |
-02:23:53.7 |
HIP 34494 |
18.42 |
| 2026-05-24 00:00 |
07:08:59.84 |
-02:23:49.1 |
HIP 34494 |
18.53 |
| 2026-05-24 12:00 |
07:09:00.87 |
-02:23:44.6 |
HIP 34494 |
18.64 |
| 2026-05-25 00:00 |
07:09:01.91 |
-02:23:40.1 |
HIP 34494 |
18.74 |
| 2026-05-25 12:00 |
07:09:02.96 |
-02:23:35.8 |
HIP 34494 |
18.86 |
| 2026-05-26 00:00 |
07:09:04.02 |
-02:23:31.5 |
HIP 34494 |
18.97 |
| 2026-05-26 12:00 |
07:09:05.08 |
-02:23:27.2 |
HIP 34494 |
19.09 |
| 2026-05-27 00:00 |
07:09:06.16 |
-02:23:23.1 |
HIP 34494 |
19.21 |
| 2026-05-27 12:00 |
07:09:07.24 |
-02:23:19.0 |
HIP 34494 |
19.33 |
| 2026-05-28 00:00 |
07:09:08.32 |
-02:23:15.0 |
HIP 34494 |
19.45 |
| 2026-05-28 12:00 |
07:09:09.42 |
-02:23:11.0 |
HIP 34494 |
19.58 |
| 2026-05-29 00:00 |
07:09:10.52 |
-02:23:07.1 |
HIP 34494 |
19.71 |
| 2026-05-29 12:00 |
07:09:11.63 |
-02:23:03.3 |
HIP 34494 |
19.84 |
| 2026-05-30 00:00 |
07:09:12.74 |
-02:22:59.5 |
HIP 34494 |
19.97 |
| 2026-05-30 12:00 |
07:09:13.87 |
-02:22:55.9 |
HIP 34494 |
20.11 |
| 2026-05-31 00:00 |
07:09:15.00 |
-02:22:52.3 |
HIP 34494 |
20.25 |
| 2026-05-31 12:00 |
07:09:16.13 |
-02:22:48.7 |
HIP 34494 |
20.39 |
| 2026-06-01 00:00 |
07:09:17.28 |
-02:22:45.3 |
HIP 34494 |
20.54 |
| 2026-06-01 12:00 |
07:09:18.43 |
-02:22:41.9 |
HIP 34494 |
20.68 |
| 2026-06-02 00:00 |
07:09:19.58 |
-02:22:38.6 |
HIP 34494 |
20.83 |