メタデータ
| 項目 |
値 |
| Designation |
C/1989 Q1 (Okazaki-Levy-Rudenko) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1989-11-11T21:59:23.887680Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:38Z |
| Obs used |
225 |
| NEO |
- |
| M1 |
8.600 |
| 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) |
1989-10-08.0000000 |
| e |
1.00005568 |
| q (au) |
0.642331 |
| a (au) |
-11536.096034 |
| i (deg) |
90.145942 |
| Ω (om, deg) |
275.510071 |
| ω (w, deg) |
150.571089 |
| M (ma, deg) |
-0.000028 |
等級
散乱 + 全体線形
$$
M_a = (7.901 + 2.905\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.901 |
| n |
2.905 |
| gf |
0.800 |
| gb |
-1.000 |
| k |
0.800 |
| δ90 |
1.286 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 1989-08-24 |
1989-09-13 |
+19.0917 |
-2.707 |
| 1989-09-13 |
1989-11-11 |
-0.2123 |
-0.358 |
| 1989-11-12 |
1990-01-05 |
+1.0681 |
+0.558 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
18:31:19.13 |
-64:35:52.5 |
HIP 90643 |
10.35 |
| 2026-09-20 12:00 |
18:31:18.41 |
-64:35:33.4 |
HIP 90643 |
10.27 |
| 2026-09-21 00:00 |
18:31:17.74 |
-64:35:14.3 |
HIP 90643 |
10.20 |
| 2026-09-21 12:00 |
18:31:17.10 |
-64:34:55.2 |
HIP 90643 |
10.15 |
| 2026-09-22 00:00 |
18:31:16.50 |
-64:34:36.0 |
HIP 90643 |
10.11 |
| 2026-09-22 12:00 |
18:31:15.93 |
-64:34:16.8 |
HIP 90643 |
10.09 |
| 2026-09-23 00:00 |
18:31:15.41 |
-64:33:57.5 |
HIP 90643 |
10.08 |
| 2026-09-23 12:00 |
18:31:14.92 |
-64:33:38.3 |
HIP 90643 |
10.09 |
| 2026-09-24 00:00 |
18:31:14.47 |
-64:33:19.0 |
HIP 90643 |
10.11 |
| 2026-09-24 12:00 |
18:31:14.06 |
-64:32:59.7 |
HIP 90643 |
10.15 |
| 2026-09-25 00:00 |
18:31:13.69 |
-64:32:40.3 |
HIP 90643 |
10.20 |
| 2026-09-25 12:00 |
18:31:13.36 |
-64:32:21.0 |
HIP 90643 |
10.26 |
| 2026-09-26 00:00 |
18:31:13.06 |
-64:32:01.6 |
HIP 90643 |
10.34 |
| 2026-09-26 12:00 |
18:31:12.80 |
-64:31:42.2 |
HIP 90643 |
10.43 |
| 2026-09-27 00:00 |
18:31:12.58 |
-64:31:22.8 |
HIP 90643 |
10.53 |
| 2026-09-27 12:00 |
18:31:12.40 |
-64:31:03.4 |
HIP 90643 |
10.65 |
| 2026-09-28 00:00 |
18:31:12.25 |
-64:30:44.0 |
HIP 90643 |
10.78 |
| 2026-09-28 12:00 |
18:31:12.15 |
-64:30:24.5 |
HIP 90643 |
10.92 |
| 2026-09-29 00:00 |
18:31:12.08 |
-64:30:05.1 |
HIP 90643 |
11.07 |
| 2026-09-29 12:00 |
18:31:12.05 |
-64:29:45.6 |
HIP 90643 |
11.23 |
| 2026-09-30 00:00 |
18:31:12.05 |
-64:29:26.1 |
HIP 90643 |
11.41 |
| 2026-09-30 12:00 |
18:31:12.10 |
-64:29:06.6 |
HIP 90643 |
11.59 |
| 2026-10-01 00:00 |
18:31:12.18 |
-64:28:47.2 |
HIP 90643 |
11.78 |
| 2026-10-01 12:00 |
18:31:12.30 |
-64:28:27.7 |
HIP 90643 |
11.98 |
| 2026-10-02 00:00 |
18:31:12.46 |
-64:28:08.2 |
HIP 90643 |
12.19 |
| 2026-10-02 12:00 |
18:31:12.66 |
-64:27:48.7 |
HIP 90643 |
12.41 |
| 2026-10-03 00:00 |
18:31:12.89 |
-64:27:29.2 |
HIP 90643 |
12.64 |
| 2026-10-03 12:00 |
18:31:13.17 |
-64:27:09.7 |
HIP 90643 |
12.87 |
| 2026-10-04 00:00 |
18:31:13.48 |
-64:26:50.2 |
HIP 90643 |
13.11 |
| 2026-10-04 12:00 |
18:31:13.83 |
-64:26:30.7 |
HIP 90643 |
13.36 |
| 2026-10-05 00:00 |
18:31:14.21 |
-64:26:11.2 |
HIP 90643 |
13.61 |
| 2026-10-05 12:00 |
18:31:14.64 |
-64:25:51.7 |
HIP 90643 |
13.87 |
| 2026-10-06 00:00 |
18:31:15.10 |
-64:25:32.2 |
HIP 90643 |
14.14 |
| 2026-10-06 12:00 |
18:31:15.60 |
-64:25:12.7 |
HIP 90643 |
14.41 |
| 2026-10-07 00:00 |
18:31:16.14 |
-64:24:53.3 |
HIP 90643 |
14.68 |
| 2026-10-07 12:00 |
18:31:16.71 |
-64:24:33.8 |
HIP 90643 |
14.96 |
| 2026-10-08 00:00 |
18:31:17.32 |
-64:24:14.4 |
HIP 90643 |
15.25 |
| 2026-10-08 12:00 |
18:31:17.97 |
-64:23:55.0 |
HIP 90643 |
15.54 |
| 2026-10-09 00:00 |
18:31:18.66 |
-64:23:35.6 |
HIP 90643 |
15.83 |
| 2026-10-09 12:00 |
18:31:19.39 |
-64:23:16.2 |
HIP 90773 |
15.77 |
| 2026-10-10 00:00 |
18:31:20.15 |
-64:22:56.8 |
HIP 90773 |
15.46 |
| 2026-10-10 12:00 |
18:31:20.95 |
-64:22:37.5 |
HIP 90773 |
15.14 |
| 2026-10-11 00:00 |
18:31:21.79 |
-64:22:18.2 |
HIP 90773 |
14.83 |