メタデータ
| 項目 |
値 |
| Designation |
C/1931 P1 (Ryves) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1931-08-25T21:54:00Z |
| Orbit solution date (soln_date, UTC) |
- |
| Obs used |
25 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1931-08-07.0000000 |
| e |
0.99932600 |
| q (au) |
0.074924 |
| a (au) |
111.163205 |
| i (deg) |
169.288100 |
| Ω (om, deg) |
102.277600 |
| ω (w, deg) |
168.145500 |
| M (ma, deg) |
-0.015904 |
等級
散乱 + 全体線形
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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 |
07:48:57.64 |
+18:29:21.3 |
HIP 38092 |
12.36 |
| 2026-05-12 12:00 |
07:48:58.13 |
+18:29:20.7 |
HIP 38092 |
12.43 |
| 2026-05-13 00:00 |
07:48:58.63 |
+18:29:20.1 |
HIP 38092 |
12.50 |
| 2026-05-13 12:00 |
07:48:59.14 |
+18:29:19.4 |
HIP 38092 |
12.58 |
| 2026-05-14 00:00 |
07:48:59.65 |
+18:29:18.8 |
HIP 38092 |
12.65 |
| 2026-05-14 12:00 |
07:49:00.18 |
+18:29:18.1 |
HIP 38092 |
12.73 |
| 2026-05-15 00:00 |
07:49:00.71 |
+18:29:17.4 |
HIP 38092 |
12.81 |
| 2026-05-15 12:00 |
07:49:01.26 |
+18:29:16.6 |
HIP 38092 |
12.90 |
| 2026-05-16 00:00 |
07:49:01.81 |
+18:29:15.8 |
HIP 38092 |
12.98 |
| 2026-05-16 12:00 |
07:49:02.37 |
+18:29:15.0 |
HIP 38092 |
13.07 |
| 2026-05-17 00:00 |
07:49:02.93 |
+18:29:14.2 |
HIP 38092 |
13.15 |
| 2026-05-17 12:00 |
07:49:03.51 |
+18:29:13.4 |
HIP 38092 |
13.24 |
| 2026-05-18 00:00 |
07:49:04.10 |
+18:29:12.5 |
HIP 38092 |
13.34 |
| 2026-05-18 12:00 |
07:49:04.69 |
+18:29:11.6 |
HIP 38092 |
13.43 |
| 2026-05-19 00:00 |
07:49:05.29 |
+18:29:10.6 |
HIP 38092 |
13.53 |
| 2026-05-19 12:00 |
07:49:05.90 |
+18:29:09.7 |
HIP 38092 |
13.62 |
| 2026-05-20 00:00 |
07:49:06.52 |
+18:29:08.7 |
HIP 38092 |
13.72 |
| 2026-05-20 12:00 |
07:49:07.14 |
+18:29:07.7 |
HIP 38092 |
13.83 |
| 2026-05-21 00:00 |
07:49:07.78 |
+18:29:06.7 |
HIP 38092 |
13.93 |
| 2026-05-21 12:00 |
07:49:08.42 |
+18:29:05.6 |
HIP 38092 |
14.04 |
| 2026-05-22 00:00 |
07:49:09.07 |
+18:29:04.5 |
HIP 38092 |
14.15 |
| 2026-05-22 12:00 |
07:49:09.73 |
+18:29:03.4 |
HIP 38092 |
14.26 |
| 2026-05-23 00:00 |
07:49:10.40 |
+18:29:02.3 |
HIP 38092 |
14.37 |
| 2026-05-23 12:00 |
07:49:11.07 |
+18:29:01.2 |
HIP 38092 |
14.48 |
| 2026-05-24 00:00 |
07:49:11.75 |
+18:29:00.0 |
HIP 38092 |
14.60 |
| 2026-05-24 12:00 |
07:49:12.44 |
+18:28:58.8 |
HIP 38092 |
14.72 |
| 2026-05-25 00:00 |
07:49:13.14 |
+18:28:57.5 |
HIP 38092 |
14.84 |
| 2026-05-25 12:00 |
07:49:13.84 |
+18:28:56.3 |
HIP 38092 |
14.96 |
| 2026-05-26 00:00 |
07:49:14.55 |
+18:28:55.0 |
HIP 38092 |
15.09 |
| 2026-05-26 12:00 |
07:49:15.27 |
+18:28:53.7 |
HIP 38092 |
15.22 |
| 2026-05-27 00:00 |
07:49:16.00 |
+18:28:52.4 |
HIP 38092 |
15.35 |
| 2026-05-27 12:00 |
07:49:16.73 |
+18:28:51.1 |
HIP 38092 |
15.48 |
| 2026-05-28 00:00 |
07:49:17.47 |
+18:28:49.7 |
HIP 38092 |
15.61 |
| 2026-05-28 12:00 |
07:49:18.22 |
+18:28:48.3 |
HIP 38092 |
15.75 |
| 2026-05-29 00:00 |
07:49:18.98 |
+18:28:46.9 |
HIP 38092 |
15.88 |
| 2026-05-29 12:00 |
07:49:19.74 |
+18:28:45.4 |
HIP 38092 |
16.02 |
| 2026-05-30 00:00 |
07:49:20.51 |
+18:28:44.0 |
HIP 38092 |
16.17 |
| 2026-05-30 12:00 |
07:49:21.29 |
+18:28:42.5 |
HIP 38092 |
16.31 |
| 2026-05-31 00:00 |
07:49:22.07 |
+18:28:41.0 |
HIP 38092 |
16.46 |
| 2026-05-31 12:00 |
07:49:22.86 |
+18:28:39.4 |
HIP 38092 |
16.60 |
| 2026-06-01 00:00 |
07:49:23.66 |
+18:28:37.9 |
HIP 38092 |
16.75 |
| 2026-06-01 12:00 |
07:49:24.47 |
+18:28:36.3 |
HIP 38092 |
16.91 |
| 2026-06-02 00:00 |
07:49:25.28 |
+18:28:34.7 |
HIP 38092 |
17.06 |