メタデータ
| 項目 |
値 |
| Designation |
C/1993 Y1 (McNaught-Russell) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1994-03-31T02:18:06.736320Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:47Z |
| Obs used |
377 |
| NEO |
- |
| M1 |
12.300 |
| K1 |
10.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1994-04-28.0000000 |
| e |
0.99355692 |
| q (au) |
0.867635 |
| a (au) |
134.661517 |
| i (deg) |
51.586469 |
| Ω (om, deg) |
166.359073 |
| ω (w, deg) |
353.467558 |
| M (ma, deg) |
0.017600 |
等級
散乱 + 全体線形
$$
M_a = (9.244 + 4.880\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.244 |
| n |
4.880 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
1.000 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 1993-12-17 |
1994-03-02 |
+18.4445 |
-0.750 |
| 1994-03-02 |
1994-03-31 |
-10.7206 |
-0.342 |
| 1994-03-31 |
1994-06-09 |
-1.1734 |
-0.051 |
| 1994-06-09 |
1994-10-02 |
+5.2847 |
-0.850 |
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) |
| 2026-06-01 00:00 |
22:05:10.67 |
+04:30:56.1 |
HIP 109078 |
23.19 |
| 2026-06-01 12:00 |
22:05:10.33 |
+04:31:02.7 |
HIP 109078 |
23.13 |
| 2026-06-02 00:00 |
22:05:09.97 |
+04:31:09.1 |
HIP 109078 |
23.07 |
| 2026-06-02 12:00 |
22:05:09.59 |
+04:31:15.5 |
HIP 109078 |
23.02 |
| 2026-06-03 00:00 |
22:05:09.20 |
+04:31:21.8 |
HIP 109078 |
22.97 |
| 2026-06-03 12:00 |
22:05:08.79 |
+04:31:27.9 |
HIP 109078 |
22.92 |
| 2026-06-04 00:00 |
22:05:08.36 |
+04:31:33.9 |
HIP 109078 |
22.88 |
| 2026-06-04 12:00 |
22:05:07.91 |
+04:31:39.9 |
HIP 109078 |
22.84 |
| 2026-06-05 00:00 |
22:05:07.45 |
+04:31:45.7 |
HIP 109078 |
22.81 |
| 2026-06-05 12:00 |
22:05:06.97 |
+04:31:51.4 |
HIP 109078 |
22.78 |
| 2026-06-06 00:00 |
22:05:06.47 |
+04:31:57.0 |
HIP 109078 |
22.76 |
| 2026-06-06 12:00 |
22:05:05.96 |
+04:32:02.5 |
HIP 109078 |
22.74 |
| 2026-06-07 00:00 |
22:05:05.43 |
+04:32:07.9 |
HIP 109078 |
22.73 |
| 2026-06-07 12:00 |
22:05:04.88 |
+04:32:13.2 |
HIP 109078 |
22.72 |
| 2026-06-08 00:00 |
22:05:04.32 |
+04:32:18.4 |
HIP 109078 |
22.72 |
| 2026-06-08 12:00 |
22:05:03.74 |
+04:32:23.4 |
HIP 109078 |
22.72 |
| 2026-06-09 00:00 |
22:05:03.14 |
+04:32:28.4 |
HIP 109078 |
22.72 |
| 2026-06-09 12:00 |
22:05:02.52 |
+04:32:33.2 |
HIP 109078 |
22.73 |
| 2026-06-10 00:00 |
22:05:01.89 |
+04:32:37.9 |
HIP 109078 |
22.75 |
| 2026-06-10 12:00 |
22:05:01.24 |
+04:32:42.5 |
HIP 109078 |
22.77 |
| 2026-06-11 00:00 |
22:05:00.58 |
+04:32:47.0 |
HIP 109078 |
22.80 |
| 2026-06-11 12:00 |
22:04:59.90 |
+04:32:51.4 |
HIP 109078 |
22.83 |
| 2026-06-12 00:00 |
22:04:59.20 |
+04:32:55.7 |
HIP 109078 |
22.87 |
| 2026-06-12 12:00 |
22:04:58.49 |
+04:32:59.8 |
HIP 108901 |
22.78 |
| 2026-06-13 00:00 |
22:04:57.76 |
+04:33:03.8 |
HIP 108901 |
22.64 |
| 2026-06-13 12:00 |
22:04:57.01 |
+04:33:07.8 |
HIP 108901 |
22.50 |
| 2026-06-14 00:00 |
22:04:56.24 |
+04:33:11.6 |
HIP 108920 |
22.32 |
| 2026-06-14 12:00 |
22:04:55.46 |
+04:33:15.2 |
HIP 108920 |
22.13 |
| 2026-06-15 00:00 |
22:04:54.67 |
+04:33:18.8 |
HIP 108920 |
21.94 |
| 2026-06-15 12:00 |
22:04:53.85 |
+04:33:22.3 |
HIP 108920 |
21.75 |
| 2026-06-16 00:00 |
22:04:53.03 |
+04:33:25.6 |
HIP 108920 |
21.56 |
| 2026-06-16 12:00 |
22:04:52.18 |
+04:33:28.8 |
HIP 108920 |
21.37 |
| 2026-06-17 00:00 |
22:04:51.32 |
+04:33:31.9 |
HIP 108920 |
21.17 |
| 2026-06-17 12:00 |
22:04:50.44 |
+04:33:34.9 |
HIP 108920 |
20.97 |
| 2026-06-18 00:00 |
22:04:49.55 |
+04:33:37.7 |
HIP 108920 |
20.78 |
| 2026-06-18 12:00 |
22:04:48.64 |
+04:33:40.4 |
HIP 108920 |
20.58 |
| 2026-06-19 00:00 |
22:04:47.72 |
+04:33:43.1 |
HIP 108920 |
20.38 |
| 2026-06-19 12:00 |
22:04:46.78 |
+04:33:45.6 |
HIP 108920 |
20.18 |
| 2026-06-20 00:00 |
22:04:45.82 |
+04:33:47.9 |
HIP 108920 |
19.98 |
| 2026-06-20 12:00 |
22:04:44.85 |
+04:33:50.2 |
HIP 108920 |
19.78 |
| 2026-06-21 00:00 |
22:04:43.86 |
+04:33:52.3 |
HIP 108920 |
19.58 |
| 2026-06-21 12:00 |
22:04:42.86 |
+04:33:54.3 |
HIP 108920 |
19.37 |
| 2026-06-22 00:00 |
22:04:41.84 |
+04:33:56.2 |
HIP 108920 |
19.17 |