C/1990 N1 (Tsuchiya-Kiuchi)
メタデータ
| 項目 |
値 |
| Designation |
C/1990 N1 (Tsuchiya-Kiuchi) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1990-09-28T17:50:51.195840Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:38Z |
| Obs used |
103 |
| NEO |
- |
| M1 |
5.700 |
| K1 |
10.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1990-09-26.0000000 |
| e |
0.99539790 |
| q (au) |
1.092441 |
| a (au) |
237.378969 |
| i (deg) |
143.783475 |
| Ω (om, deg) |
330.737409 |
| ω (w, deg) |
180.920585 |
| M (ma, deg) |
359.999261 |
等級
散乱 + 全体線形
$$
M_a = (5.880 + 4.904\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
5.880 |
| n |
4.904 |
| gf |
0.997 |
| gb |
-0.500 |
| k |
0.800 |
| δ90 |
2.918 |
| 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 |
| 1990-07-13 |
1990-08-19 |
-3.4293 |
+0.264 |
| 1990-10-02 |
1991-01-11 |
+3.5468 |
-0.253 |
| 1991-01-11 |
1991-02-10 |
-7.5821 |
+3.627 |
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) |
| 2026-02-03 00:00 |
23:04:33.96 |
-14:36:39.9 |
HIP 114035 |
19.62 |
| 2026-02-03 12:00 |
23:04:35.57 |
-14:36:27.3 |
HIP 114035 |
19.19 |
| 2026-02-04 00:00 |
23:04:37.19 |
-14:36:14.7 |
HIP 114035 |
18.76 |
| 2026-02-04 12:00 |
23:04:38.82 |
-14:36:02.1 |
HIP 114035 |
18.32 |
| 2026-02-05 00:00 |
23:04:40.46 |
-14:35:49.5 |
HIP 114035 |
17.89 |
| 2026-02-05 12:00 |
23:04:42.10 |
-14:35:36.9 |
HIP 114035 |
17.45 |
| 2026-02-06 00:00 |
23:04:43.76 |
-14:35:24.3 |
HIP 114035 |
17.01 |
| 2026-02-06 12:00 |
23:04:45.42 |
-14:35:11.6 |
HIP 114035 |
16.57 |
| 2026-02-07 00:00 |
23:04:47.08 |
-14:34:59.0 |
HIP 114035 |
16.14 |
| 2026-02-07 12:00 |
23:04:48.76 |
-14:34:46.3 |
HIP 114035 |
15.70 |
| 2026-02-08 00:00 |
23:04:50.44 |
-14:34:33.7 |
HIP 114035 |
15.26 |
| 2026-02-08 12:00 |
23:04:52.13 |
-14:34:21.0 |
HIP 114035 |
14.82 |
| 2026-02-09 00:00 |
23:04:53.83 |
-14:34:08.3 |
HIP 114035 |
14.38 |
| 2026-02-09 12:00 |
23:04:55.53 |
-14:33:55.6 |
HIP 114035 |
13.94 |
| 2026-02-10 00:00 |
23:04:57.25 |
-14:33:42.9 |
HIP 114035 |
13.50 |
| 2026-02-10 12:00 |
23:04:58.96 |
-14:33:30.2 |
HIP 114035 |
13.06 |
| 2026-02-11 00:00 |
23:05:00.69 |
-14:33:17.5 |
HIP 114035 |
12.63 |
| 2026-02-11 12:00 |
23:05:02.42 |
-14:33:04.8 |
HIP 114035 |
12.19 |
| 2026-02-12 00:00 |
23:05:04.15 |
-14:32:52.1 |
HIP 114035 |
11.75 |
| 2026-02-12 12:00 |
23:05:05.90 |
-14:32:39.4 |
HIP 114035 |
11.32 |
| 2026-02-13 00:00 |
23:05:07.65 |
-14:32:26.6 |
HIP 114035 |
10.89 |
| 2026-02-13 12:00 |
23:05:09.40 |
-14:32:13.9 |
HIP 114035 |
10.46 |
| 2026-02-14 00:00 |
23:05:11.16 |
-14:32:01.2 |
HIP 114035 |
10.04 |
| 2026-02-14 12:00 |
23:05:12.93 |
-14:31:48.5 |
HIP 114035 |
9.62 |
| 2026-02-15 00:00 |
23:05:14.70 |
-14:31:35.8 |
HIP 114035 |
9.21 |
| 2026-02-15 12:00 |
23:05:16.48 |
-14:31:23.1 |
HIP 114035 |
8.80 |
| 2026-02-16 00:00 |
23:05:18.26 |
-14:31:10.4 |
HIP 114035 |
8.40 |
| 2026-02-16 12:00 |
23:05:20.05 |
-14:30:57.7 |
HIP 114035 |
8.00 |
| 2026-02-17 00:00 |
23:05:21.84 |
-14:30:45.1 |
HIP 114035 |
7.62 |
| 2026-02-17 12:00 |
23:05:23.64 |
-14:30:32.4 |
HIP 114035 |
7.24 |
| 2026-02-18 00:00 |
23:05:25.44 |
-14:30:19.7 |
HIP 114035 |
6.89 |
| 2026-02-18 12:00 |
23:05:27.24 |
-14:30:07.1 |
HIP 114035 |
6.54 |
| 2026-02-19 00:00 |
23:05:29.05 |
-14:29:54.5 |
HIP 114035 |
6.22 |
| 2026-02-19 12:00 |
23:05:30.87 |
-14:29:41.8 |
HIP 114035 |
5.92 |
| 2026-02-20 00:00 |
23:05:32.69 |
-14:29:29.2 |
HIP 114035 |
5.64 |
| 2026-02-20 12:00 |
23:05:34.51 |
-14:29:16.6 |
HIP 114035 |
5.39 |
| 2026-02-21 00:00 |
23:05:36.34 |
-14:29:04.1 |
HIP 114035 |
5.18 |
| 2026-02-21 12:00 |
23:05:38.16 |
-14:28:51.5 |
HIP 114058 |
4.94 |
| 2026-02-22 00:00 |
23:05:40.00 |
-14:28:39.0 |
HIP 114058 |
4.45 |
| 2026-02-22 12:00 |
23:05:41.83 |
-14:28:26.4 |
HIP 114058 |
3.95 |
| 2026-02-23 00:00 |
23:05:43.67 |
-14:28:13.9 |
HIP 114058 |
3.46 |
| 2026-02-23 12:00 |
23:05:45.52 |
-14:28:01.5 |
HIP 114058 |
2.97 |
| 2026-02-24 00:00 |
23:05:47.36 |
-14:27:49.0 |
HIP 114058 |
2.48 |