メタデータ
| 項目 |
値 |
| Designation |
C/1987 Q1 (Rudenko) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1987-10-09T12:40:34.371840Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:33Z |
| Obs used |
90 |
| NEO |
- |
| M1 |
8.400 |
| K1 |
10.750 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1987-09-27.0000000 |
| e |
1.00044313 |
| q (au) |
0.602602 |
| a (au) |
-1359.867867 |
| i (deg) |
114.875276 |
| Ω (om, deg) |
298.569684 |
| ω (w, deg) |
143.833532 |
| M (ma, deg) |
-0.000246 |
等級
散乱 + 全体線形
$$
M_a = (7.946 + 3.712\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.946 |
| n |
3.712 |
| 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 |
23:07:29.02 |
-51:29:30.8 |
HIP 114248 |
16.95 |
| 2026-03-26 12:00 |
23:07:31.57 |
-51:29:29.9 |
HIP 114248 |
16.79 |
| 2026-03-27 00:00 |
23:07:34.10 |
-51:29:29.2 |
HIP 114248 |
16.63 |
| 2026-03-27 12:00 |
23:07:36.63 |
-51:29:28.7 |
HIP 114248 |
16.48 |
| 2026-03-28 00:00 |
23:07:39.14 |
-51:29:28.3 |
HIP 114248 |
16.34 |
| 2026-03-28 12:00 |
23:07:41.65 |
-51:29:28.2 |
HIP 114248 |
16.20 |
| 2026-03-29 00:00 |
23:07:44.16 |
-51:29:28.2 |
HIP 114248 |
16.07 |
| 2026-03-29 12:00 |
23:07:46.65 |
-51:29:28.4 |
HIP 114248 |
15.94 |
| 2026-03-30 00:00 |
23:07:49.13 |
-51:29:28.8 |
HIP 114248 |
15.82 |
| 2026-03-30 12:00 |
23:07:51.61 |
-51:29:29.3 |
HIP 114248 |
15.71 |
| 2026-03-31 00:00 |
23:07:54.07 |
-51:29:30.1 |
HIP 114248 |
15.60 |
| 2026-03-31 12:00 |
23:07:56.53 |
-51:29:31.0 |
HIP 114248 |
15.50 |
| 2026-04-01 00:00 |
23:07:58.97 |
-51:29:32.1 |
HIP 114248 |
15.41 |
| 2026-04-01 12:00 |
23:08:01.41 |
-51:29:33.3 |
HIP 114248 |
15.32 |
| 2026-04-02 00:00 |
23:08:03.84 |
-51:29:34.8 |
HIP 114248 |
15.23 |
| 2026-04-02 12:00 |
23:08:06.25 |
-51:29:36.4 |
HIP 114248 |
15.16 |
| 2026-04-03 00:00 |
23:08:08.66 |
-51:29:38.2 |
HIP 114248 |
15.09 |
| 2026-04-03 12:00 |
23:08:11.06 |
-51:29:40.2 |
HIP 114248 |
15.02 |
| 2026-04-04 00:00 |
23:08:13.44 |
-51:29:42.3 |
HIP 114248 |
14.97 |
| 2026-04-04 12:00 |
23:08:15.82 |
-51:29:44.7 |
HIP 114248 |
14.91 |
| 2026-04-05 00:00 |
23:08:18.18 |
-51:29:47.2 |
HIP 114248 |
14.87 |
| 2026-04-05 12:00 |
23:08:20.54 |
-51:29:49.9 |
HIP 114248 |
14.83 |
| 2026-04-06 00:00 |
23:08:22.88 |
-51:29:52.7 |
HIP 114248 |
14.79 |
| 2026-04-06 12:00 |
23:08:25.21 |
-51:29:55.8 |
HIP 114248 |
14.77 |
| 2026-04-07 00:00 |
23:08:27.53 |
-51:29:59.0 |
HIP 114248 |
14.74 |
| 2026-04-07 12:00 |
23:08:29.84 |
-51:30:02.4 |
HIP 114248 |
14.73 |
| 2026-04-08 00:00 |
23:08:32.14 |
-51:30:06.0 |
HIP 114248 |
14.72 |
| 2026-04-08 12:00 |
23:08:34.42 |
-51:30:09.7 |
HIP 114248 |
14.71 |
| 2026-04-09 00:00 |
23:08:36.70 |
-51:30:13.6 |
HIP 114248 |
14.71 |
| 2026-04-09 12:00 |
23:08:38.96 |
-51:30:17.7 |
HIP 114248 |
14.72 |
| 2026-04-10 00:00 |
23:08:41.21 |
-51:30:22.0 |
HIP 114248 |
14.73 |
| 2026-04-10 12:00 |
23:08:43.44 |
-51:30:26.5 |
HIP 114248 |
14.75 |
| 2026-04-11 00:00 |
23:08:45.67 |
-51:30:31.1 |
HIP 114248 |
14.77 |
| 2026-04-11 12:00 |
23:08:47.88 |
-51:30:35.9 |
HIP 114248 |
14.80 |
| 2026-04-12 00:00 |
23:08:50.07 |
-51:30:40.9 |
HIP 114248 |
14.83 |
| 2026-04-12 12:00 |
23:08:52.26 |
-51:30:46.0 |
HIP 114248 |
14.87 |
| 2026-04-13 00:00 |
23:08:54.43 |
-51:30:51.3 |
HIP 114248 |
14.91 |
| 2026-04-13 12:00 |
23:08:56.59 |
-51:30:56.8 |
HIP 114248 |
14.95 |
| 2026-04-14 00:00 |
23:08:58.73 |
-51:31:02.5 |
HIP 114248 |
15.00 |
| 2026-04-14 12:00 |
23:09:00.86 |
-51:31:08.4 |
HIP 114248 |
15.06 |
| 2026-04-15 00:00 |
23:09:02.98 |
-51:31:14.4 |
HIP 114248 |
15.12 |
| 2026-04-15 12:00 |
23:09:05.08 |
-51:31:20.6 |
HIP 114248 |
15.18 |
| 2026-04-16 00:00 |
23:09:07.17 |
-51:31:26.9 |
HIP 114248 |
15.24 |