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 |
1991-01-10 |
+3.4774 |
-0.245 |
| 1991-01-10 |
1991-02-10 |
-5.5277 |
+2.934 |
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) |
| 2026-03-26 00:00 |
23:07:38.13 |
-14:16:30.5 |
HIP 114058 |
26.64 |
| 2026-03-26 12:00 |
23:07:39.90 |
-14:16:20.9 |
HIP 114058 |
27.10 |
| 2026-03-27 00:00 |
23:07:41.65 |
-14:16:11.3 |
HIP 114058 |
27.55 |
| 2026-03-27 12:00 |
23:07:43.40 |
-14:16:01.8 |
HIP 114058 |
28.00 |
| 2026-03-28 00:00 |
23:07:45.15 |
-14:15:52.3 |
HIP 114058 |
28.46 |
| 2026-03-28 12:00 |
23:07:46.89 |
-14:15:43.0 |
HIP 114058 |
28.90 |
| 2026-03-29 00:00 |
23:07:48.62 |
-14:15:33.7 |
HIP 114058 |
29.35 |
| 2026-03-29 12:00 |
23:07:50.34 |
-14:15:24.5 |
HIP 114058 |
29.80 |
| 2026-03-30 00:00 |
23:07:52.06 |
-14:15:15.3 |
HIP 114058 |
30.24 |
| 2026-03-30 12:00 |
23:07:53.78 |
-14:15:06.2 |
HIP 114058 |
30.68 |
| 2026-03-31 00:00 |
23:07:55.48 |
-14:14:57.2 |
HIP 114058 |
31.12 |
| 2026-03-31 12:00 |
23:07:57.18 |
-14:14:48.3 |
HIP 114371 |
31.48 |
| 2026-04-01 00:00 |
23:07:58.88 |
-14:14:39.4 |
HIP 114371 |
31.20 |
| 2026-04-01 12:00 |
23:08:00.56 |
-14:14:30.7 |
HIP 114371 |
30.92 |
| 2026-04-02 00:00 |
23:08:02.24 |
-14:14:21.9 |
HIP 114371 |
30.65 |
| 2026-04-02 12:00 |
23:08:03.92 |
-14:14:13.3 |
HIP 114371 |
30.39 |
| 2026-04-03 00:00 |
23:08:05.58 |
-14:14:04.8 |
HIP 114371 |
30.13 |
| 2026-04-03 12:00 |
23:08:07.24 |
-14:13:56.3 |
HIP 114371 |
29.87 |
| 2026-04-04 00:00 |
23:08:08.89 |
-14:13:47.9 |
HIP 114371 |
29.62 |
| 2026-04-04 12:00 |
23:08:10.54 |
-14:13:39.6 |
HIP 114371 |
29.37 |
| 2026-04-05 00:00 |
23:08:12.17 |
-14:13:31.4 |
HIP 114371 |
29.13 |
| 2026-04-05 12:00 |
23:08:13.80 |
-14:13:23.2 |
HIP 114371 |
28.90 |
| 2026-04-06 00:00 |
23:08:15.42 |
-14:13:15.1 |
HIP 114371 |
28.66 |
| 2026-04-06 12:00 |
23:08:17.03 |
-14:13:07.1 |
HIP 114371 |
28.44 |
| 2026-04-07 00:00 |
23:08:18.64 |
-14:12:59.2 |
HIP 114371 |
28.21 |
| 2026-04-07 12:00 |
23:08:20.23 |
-14:12:51.4 |
HIP 114371 |
27.99 |
| 2026-04-08 00:00 |
23:08:21.82 |
-14:12:43.7 |
HIP 114371 |
27.78 |
| 2026-04-08 12:00 |
23:08:23.40 |
-14:12:36.0 |
HIP 114371 |
27.57 |
| 2026-04-09 00:00 |
23:08:24.97 |
-14:12:28.4 |
HIP 114371 |
27.37 |
| 2026-04-09 12:00 |
23:08:26.53 |
-14:12:20.9 |
HIP 114371 |
27.17 |
| 2026-04-10 00:00 |
23:08:28.08 |
-14:12:13.5 |
HIP 114371 |
26.98 |
| 2026-04-10 12:00 |
23:08:29.63 |
-14:12:06.2 |
HIP 114371 |
26.79 |
| 2026-04-11 00:00 |
23:08:31.16 |
-14:11:59.0 |
HIP 114371 |
26.61 |
| 2026-04-11 12:00 |
23:08:32.69 |
-14:11:51.8 |
HIP 114371 |
26.43 |
| 2026-04-12 00:00 |
23:08:34.21 |
-14:11:44.7 |
HIP 114371 |
26.26 |
| 2026-04-12 12:00 |
23:08:35.72 |
-14:11:37.8 |
HIP 114371 |
26.09 |
| 2026-04-13 00:00 |
23:08:37.21 |
-14:11:30.9 |
HIP 114371 |
25.93 |
| 2026-04-13 12:00 |
23:08:38.70 |
-14:11:24.1 |
HIP 114371 |
25.77 |
| 2026-04-14 00:00 |
23:08:40.18 |
-14:11:17.4 |
HIP 114371 |
25.62 |
| 2026-04-14 12:00 |
23:08:41.65 |
-14:11:10.7 |
HIP 114371 |
25.47 |
| 2026-04-15 00:00 |
23:08:43.11 |
-14:11:04.2 |
HIP 114371 |
25.33 |
| 2026-04-15 12:00 |
23:08:44.56 |
-14:10:57.8 |
HIP 114371 |
25.19 |
| 2026-04-16 00:00 |
23:08:46.00 |
-14:10:51.4 |
HIP 114371 |
25.06 |