メタデータ
| 項目 |
値 |
| Designation |
C/1932 Y1 (Dodwell-Forbes) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1932-12-30T12:36:55.002240Z |
| Orbit solution date (soln_date, UTC) |
2023-12-04T20:32:29Z |
| Obs used |
23 |
| NEO |
- |
| M1 |
9.100 |
| K1 |
15.250 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1933-01-20.0000000 |
| e |
0.97216017 |
| q (au) |
1.130765 |
| a (au) |
40.616795 |
| i (deg) |
24.502460 |
| Ω (om, deg) |
78.589152 |
| ω (w, deg) |
327.357273 |
| M (ma, deg) |
0.077957 |
等級
散乱 + 全体線形
$$
M_a = (7.943 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.943 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
15:09:55.77 |
-03:07:59.2 |
HIP 74292 |
31.26 |
| 2026-03-26 12:00 |
15:09:54.73 |
-03:07:50.9 |
HIP 74292 |
31.52 |
| 2026-03-27 00:00 |
15:09:53.67 |
-03:07:42.6 |
HIP 74292 |
31.78 |
| 2026-03-27 12:00 |
15:09:52.61 |
-03:07:34.3 |
HIP 74292 |
32.05 |
| 2026-03-28 00:00 |
15:09:51.54 |
-03:07:26.0 |
HIP 74292 |
32.31 |
| 2026-03-28 12:00 |
15:09:50.46 |
-03:07:17.7 |
HIP 74292 |
32.58 |
| 2026-03-29 00:00 |
15:09:49.37 |
-03:07:09.4 |
HIP 74292 |
32.85 |
| 2026-03-29 12:00 |
15:09:48.27 |
-03:07:01.1 |
HIP 74292 |
33.12 |
| 2026-03-30 00:00 |
15:09:47.17 |
-03:06:52.8 |
HIP 74292 |
33.39 |
| 2026-03-30 12:00 |
15:09:46.05 |
-03:06:44.5 |
HIP 74292 |
33.67 |
| 2026-03-31 00:00 |
15:09:44.93 |
-03:06:36.2 |
HIP 74292 |
33.94 |
| 2026-03-31 12:00 |
15:09:43.80 |
-03:06:27.9 |
HIP 74292 |
34.22 |
| 2026-04-01 00:00 |
15:09:42.66 |
-03:06:19.6 |
HIP 74292 |
34.50 |
| 2026-04-01 12:00 |
15:09:41.51 |
-03:06:11.3 |
HIP 74292 |
34.78 |
| 2026-04-02 00:00 |
15:09:40.35 |
-03:06:03.0 |
HIP 74292 |
35.07 |
| 2026-04-02 12:00 |
15:09:39.18 |
-03:05:54.7 |
HIP 74292 |
35.35 |
| 2026-04-03 00:00 |
15:09:38.01 |
-03:05:46.5 |
HIP 74292 |
35.64 |
| 2026-04-03 12:00 |
15:09:36.83 |
-03:05:38.2 |
HIP 74292 |
35.93 |
| 2026-04-04 00:00 |
15:09:35.64 |
-03:05:30.0 |
HIP 74292 |
36.22 |
| 2026-04-04 12:00 |
15:09:34.44 |
-03:05:21.7 |
HIP 74292 |
36.51 |
| 2026-04-05 00:00 |
15:09:33.24 |
-03:05:13.5 |
HIP 74292 |
36.81 |
| 2026-04-05 12:00 |
15:09:32.02 |
-03:05:05.3 |
HIP 74292 |
37.10 |
| 2026-04-06 00:00 |
15:09:30.80 |
-03:04:57.1 |
HIP 74292 |
37.40 |
| 2026-04-06 12:00 |
15:09:29.58 |
-03:04:48.9 |
HIP 74292 |
37.70 |
| 2026-04-07 00:00 |
15:09:28.34 |
-03:04:40.7 |
HIP 74292 |
38.00 |
| 2026-04-07 12:00 |
15:09:27.10 |
-03:04:32.5 |
HIP 74292 |
38.30 |
| 2026-04-08 00:00 |
15:09:25.85 |
-03:04:24.4 |
HIP 74292 |
38.61 |
| 2026-04-08 12:00 |
15:09:24.59 |
-03:04:16.2 |
HIP 74292 |
38.91 |
| 2026-04-09 00:00 |
15:09:23.33 |
-03:04:08.1 |
HIP 74292 |
39.22 |
| 2026-04-09 12:00 |
15:09:22.06 |
-03:04:00.0 |
HIP 74292 |
39.53 |
| 2026-04-10 00:00 |
15:09:20.78 |
-03:03:51.9 |
HIP 74292 |
39.84 |
| 2026-04-10 12:00 |
15:09:19.50 |
-03:03:43.8 |
HIP 74292 |
40.15 |
| 2026-04-11 00:00 |
15:09:18.21 |
-03:03:35.8 |
HIP 74292 |
40.46 |
| 2026-04-11 12:00 |
15:09:16.91 |
-03:03:27.7 |
HIP 74292 |
40.78 |
| 2026-04-12 00:00 |
15:09:15.61 |
-03:03:19.7 |
HIP 74292 |
41.09 |
| 2026-04-12 12:00 |
15:09:14.30 |
-03:03:11.7 |
HIP 74292 |
41.41 |
| 2026-04-13 00:00 |
15:09:12.98 |
-03:03:03.7 |
HIP 74292 |
41.73 |
| 2026-04-13 12:00 |
15:09:11.66 |
-03:02:55.7 |
HIP 74292 |
42.05 |
| 2026-04-14 00:00 |
15:09:10.33 |
-03:02:47.8 |
HIP 74292 |
42.37 |
| 2026-04-14 12:00 |
15:09:09.00 |
-03:02:39.9 |
HIP 74292 |
42.69 |
| 2026-04-15 00:00 |
15:09:07.66 |
-03:02:32.0 |
HIP 74292 |
43.02 |
| 2026-04-15 12:00 |
15:09:06.31 |
-03:02:24.1 |
HIP 74292 |
43.34 |
| 2026-04-16 00:00 |
15:09:04.96 |
-03:02:16.2 |
HIP 74292 |
43.67 |