メタデータ
| 項目 |
値 |
| Designation |
C/1969 P1 (Fujikawa) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1969-10-12T10:44:43.465920Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:19Z |
| Obs used |
69 |
| NEO |
- |
| M1 |
8.700 |
| K1 |
8.750 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1969-09-15.0000000 |
| e |
1.00000000 |
| q (au) |
0.773919 |
| a (au) |
- |
| i (deg) |
8.925201 |
| Ω (om, deg) |
192.395306 |
| ω (w, deg) |
299.019745 |
| M (ma, deg) |
- |
等級
散乱 + 全体線形
$$
M_a = (7.334 + 4.191\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.334 |
| n |
4.191 |
| gf |
1.000 |
| gb |
-0.998 |
| 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) |
| 2026-03-26 00:00 |
20:05:54.27 |
-11:40:17.9 |
HIP 98910 |
12.72 |
| 2026-03-26 12:00 |
20:05:54.91 |
-11:40:12.9 |
HIP 98910 |
12.84 |
| 2026-03-27 00:00 |
20:05:55.53 |
-11:40:08.1 |
HIP 98910 |
12.96 |
| 2026-03-27 12:00 |
20:05:56.14 |
-11:40:03.2 |
HIP 98910 |
13.08 |
| 2026-03-28 00:00 |
20:05:56.74 |
-11:39:58.4 |
HIP 98910 |
13.19 |
| 2026-03-28 12:00 |
20:05:57.33 |
-11:39:53.6 |
HIP 98910 |
13.31 |
| 2026-03-29 00:00 |
20:05:57.91 |
-11:39:48.8 |
HIP 98910 |
13.42 |
| 2026-03-29 12:00 |
20:05:58.47 |
-11:39:44.0 |
HIP 98910 |
13.53 |
| 2026-03-30 00:00 |
20:05:59.03 |
-11:39:39.3 |
HIP 98910 |
13.64 |
| 2026-03-30 12:00 |
20:05:59.57 |
-11:39:34.6 |
HIP 98910 |
13.74 |
| 2026-03-31 00:00 |
20:06:00.10 |
-11:39:29.9 |
HIP 98910 |
13.85 |
| 2026-03-31 12:00 |
20:06:00.62 |
-11:39:25.2 |
HIP 98910 |
13.95 |
| 2026-04-01 00:00 |
20:06:01.13 |
-11:39:20.6 |
HIP 98910 |
14.05 |
| 2026-04-01 12:00 |
20:06:01.62 |
-11:39:16.0 |
HIP 98910 |
14.15 |
| 2026-04-02 00:00 |
20:06:02.10 |
-11:39:11.4 |
HIP 98910 |
14.25 |
| 2026-04-02 12:00 |
20:06:02.58 |
-11:39:06.8 |
HIP 98910 |
14.35 |
| 2026-04-03 00:00 |
20:06:03.04 |
-11:39:02.3 |
HIP 98910 |
14.44 |
| 2026-04-03 12:00 |
20:06:03.48 |
-11:38:57.8 |
HIP 98910 |
14.53 |
| 2026-04-04 00:00 |
20:06:03.92 |
-11:38:53.4 |
HIP 98910 |
14.62 |
| 2026-04-04 12:00 |
20:06:04.35 |
-11:38:48.9 |
HIP 98910 |
14.71 |
| 2026-04-05 00:00 |
20:06:04.76 |
-11:38:44.5 |
HIP 98910 |
14.79 |
| 2026-04-05 12:00 |
20:06:05.16 |
-11:38:40.1 |
HIP 98910 |
14.88 |
| 2026-04-06 00:00 |
20:06:05.55 |
-11:38:35.8 |
HIP 98910 |
14.96 |
| 2026-04-06 12:00 |
20:06:05.92 |
-11:38:31.5 |
HIP 98910 |
15.04 |
| 2026-04-07 00:00 |
20:06:06.29 |
-11:38:27.2 |
HIP 98910 |
15.11 |
| 2026-04-07 12:00 |
20:06:06.64 |
-11:38:22.9 |
HIP 98910 |
15.19 |
| 2026-04-08 00:00 |
20:06:06.98 |
-11:38:18.7 |
HIP 98910 |
15.26 |
| 2026-04-08 12:00 |
20:06:07.31 |
-11:38:14.5 |
HIP 98910 |
15.33 |
| 2026-04-09 00:00 |
20:06:07.62 |
-11:38:10.3 |
HIP 98910 |
15.39 |
| 2026-04-09 12:00 |
20:06:07.93 |
-11:38:06.2 |
HIP 98910 |
15.46 |
| 2026-04-10 00:00 |
20:06:08.22 |
-11:38:02.1 |
HIP 98910 |
15.52 |
| 2026-04-10 12:00 |
20:06:08.50 |
-11:37:58.0 |
HIP 98910 |
15.58 |
| 2026-04-11 00:00 |
20:06:08.77 |
-11:37:53.9 |
HIP 98910 |
15.63 |
| 2026-04-11 12:00 |
20:06:09.02 |
-11:37:49.9 |
HIP 98910 |
15.69 |
| 2026-04-12 00:00 |
20:06:09.26 |
-11:37:46.0 |
HIP 98910 |
15.74 |
| 2026-04-12 12:00 |
20:06:09.49 |
-11:37:42.0 |
HIP 98910 |
15.79 |
| 2026-04-13 00:00 |
20:06:09.71 |
-11:37:38.1 |
HIP 98910 |
15.83 |
| 2026-04-13 12:00 |
20:06:09.92 |
-11:37:34.3 |
HIP 98910 |
15.88 |
| 2026-04-14 00:00 |
20:06:10.11 |
-11:37:30.4 |
HIP 98910 |
15.92 |
| 2026-04-14 12:00 |
20:06:10.29 |
-11:37:26.6 |
HIP 98910 |
15.96 |
| 2026-04-15 00:00 |
20:06:10.46 |
-11:37:22.8 |
HIP 98910 |
15.99 |
| 2026-04-15 12:00 |
20:06:10.62 |
-11:37:19.1 |
HIP 98910 |
16.02 |
| 2026-04-16 00:00 |
20:06:10.76 |
-11:37:15.4 |
HIP 98910 |
16.05 |