メタデータ
| 項目 |
値 |
| Designation |
C/1983 N1 (IRAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1983-05-02T16:52:11.812800Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:31Z |
| Obs used |
19 |
| 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) |
1983-12-26.0000000 |
| e |
0.99936962 |
| q (au) |
2.418058 |
| a (au) |
3835.864208 |
| i (deg) |
138.832959 |
| Ω (om, deg) |
171.801181 |
| ω (w, deg) |
265.589825 |
| M (ma, deg) |
0.000984 |
等級
散乱 + 全体線形
$$
M_a = (15.018 + 2.142\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.018 |
| n |
2.142 |
| gf |
1.000 |
| gb |
-0.842 |
| k |
0.800 |
| 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) |
| 2026-07-29 00:00 |
08:32:36.74 |
+55:48:40.2 |
HIP 41835 |
7.86 |
| 2026-07-29 12:00 |
08:32:39.63 |
+55:48:35.8 |
HIP 41835 |
8.24 |
| 2026-07-30 00:00 |
08:32:42.52 |
+55:48:31.5 |
HIP 41835 |
8.62 |
| 2026-07-30 12:00 |
08:32:45.41 |
+55:48:27.4 |
HIP 41835 |
9.00 |
| 2026-07-31 00:00 |
08:32:48.30 |
+55:48:23.4 |
HIP 41835 |
9.38 |
| 2026-07-31 12:00 |
08:32:51.19 |
+55:48:19.5 |
HIP 41835 |
9.77 |
| 2026-08-01 00:00 |
08:32:54.08 |
+55:48:15.8 |
HIP 41835 |
10.16 |
| 2026-08-01 12:00 |
08:32:56.97 |
+55:48:12.1 |
HIP 41835 |
10.55 |
| 2026-08-02 00:00 |
08:32:59.85 |
+55:48:08.6 |
HIP 41835 |
10.94 |
| 2026-08-02 12:00 |
08:33:02.74 |
+55:48:05.3 |
HIP 41835 |
11.34 |
| 2026-08-03 00:00 |
08:33:05.62 |
+55:48:02.1 |
HIP 41835 |
11.73 |
| 2026-08-03 12:00 |
08:33:08.50 |
+55:47:58.9 |
HIP 41835 |
12.13 |
| 2026-08-04 00:00 |
08:33:11.38 |
+55:47:56.0 |
HIP 41835 |
12.52 |
| 2026-08-04 12:00 |
08:33:14.25 |
+55:47:53.1 |
HIP 41835 |
12.92 |
| 2026-08-05 00:00 |
08:33:17.13 |
+55:47:50.4 |
HIP 41835 |
13.32 |
| 2026-08-05 12:00 |
08:33:20.00 |
+55:47:47.9 |
HIP 41835 |
13.72 |
| 2026-08-06 00:00 |
08:33:22.86 |
+55:47:45.4 |
HIP 41835 |
14.12 |
| 2026-08-06 12:00 |
08:33:25.73 |
+55:47:43.1 |
HIP 41835 |
14.51 |
| 2026-08-07 00:00 |
08:33:28.59 |
+55:47:40.9 |
HIP 41835 |
14.91 |
| 2026-08-07 12:00 |
08:33:31.45 |
+55:47:38.9 |
HIP 41835 |
15.31 |
| 2026-08-08 00:00 |
08:33:34.30 |
+55:47:36.9 |
HIP 41835 |
15.71 |
| 2026-08-08 12:00 |
08:33:37.15 |
+55:47:35.2 |
HIP 41835 |
16.11 |
| 2026-08-09 00:00 |
08:33:40.00 |
+55:47:33.5 |
HIP 41835 |
16.51 |
| 2026-08-09 12:00 |
08:33:42.84 |
+55:47:32.0 |
HIP 41835 |
16.90 |
| 2026-08-10 00:00 |
08:33:45.68 |
+55:47:30.6 |
HIP 41835 |
17.30 |
| 2026-08-10 12:00 |
08:33:48.51 |
+55:47:29.4 |
HIP 41835 |
17.70 |
| 2026-08-11 00:00 |
08:33:51.34 |
+55:47:28.3 |
HIP 41835 |
18.09 |
| 2026-08-11 12:00 |
08:33:54.17 |
+55:47:27.3 |
HIP 41835 |
18.49 |
| 2026-08-12 00:00 |
08:33:56.98 |
+55:47:26.4 |
HIP 41835 |
18.88 |
| 2026-08-12 12:00 |
08:33:59.80 |
+55:47:25.7 |
HIP 41835 |
19.28 |
| 2026-08-13 00:00 |
08:34:02.60 |
+55:47:25.2 |
HIP 41835 |
19.67 |
| 2026-08-13 12:00 |
08:34:05.40 |
+55:47:24.7 |
HIP 41835 |
20.07 |
| 2026-08-14 00:00 |
08:34:08.20 |
+55:47:24.4 |
HIP 41835 |
20.46 |
| 2026-08-14 12:00 |
08:34:10.98 |
+55:47:24.3 |
HIP 41835 |
20.85 |
| 2026-08-15 00:00 |
08:34:13.77 |
+55:47:24.2 |
HIP 41835 |
21.24 |
| 2026-08-15 12:00 |
08:34:16.54 |
+55:47:24.3 |
HIP 41835 |
21.63 |
| 2026-08-16 00:00 |
08:34:19.31 |
+55:47:24.6 |
HIP 41835 |
22.02 |
| 2026-08-16 12:00 |
08:34:22.07 |
+55:47:25.0 |
HIP 41835 |
22.41 |
| 2026-08-17 00:00 |
08:34:24.82 |
+55:47:25.5 |
HIP 42261 |
22.48 |
| 2026-08-17 12:00 |
08:34:27.57 |
+55:47:26.1 |
HIP 42261 |
22.09 |
| 2026-08-18 00:00 |
08:34:30.30 |
+55:47:26.9 |
HIP 42261 |
21.71 |
| 2026-08-18 12:00 |
08:34:33.03 |
+55:47:27.9 |
HIP 42261 |
21.33 |
| 2026-08-19 00:00 |
08:34:35.76 |
+55:47:28.9 |
HIP 42261 |
20.95 |