C/1993 Y1 (McNaught-Russell)
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 |
1994-01-30 |
+27.2747 |
-2.680 |
| 1994-01-30 |
1994-03-06 |
+5.3708 |
-0.137 |
| 1994-03-06 |
1994-03-31 |
-11.6464 |
-0.396 |
| 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) |
| 2026-02-03 00:00 |
21:59:59.43 |
+03:45:12.3 |
HIP 108473 |
22.71 |
| 2026-02-03 12:00 |
22:00:01.51 |
+03:45:20.4 |
HIP 108473 |
23.22 |
| 2026-02-04 00:00 |
22:00:03.59 |
+03:45:28.6 |
HIP 108473 |
23.74 |
| 2026-02-04 12:00 |
22:00:05.68 |
+03:45:36.9 |
HIP 108473 |
24.25 |
| 2026-02-05 00:00 |
22:00:07.78 |
+03:45:45.3 |
HIP 108473 |
24.77 |
| 2026-02-05 12:00 |
22:00:09.87 |
+03:45:53.8 |
HIP 108473 |
25.28 |
| 2026-02-06 00:00 |
22:00:11.97 |
+03:46:02.4 |
HIP 108473 |
25.80 |
| 2026-02-06 12:00 |
22:00:14.08 |
+03:46:11.0 |
HIP 108473 |
26.33 |
| 2026-02-07 00:00 |
22:00:16.18 |
+03:46:19.8 |
HIP 108473 |
26.85 |
| 2026-02-07 12:00 |
22:00:18.29 |
+03:46:28.7 |
HIP 108473 |
27.37 |
| 2026-02-08 00:00 |
22:00:20.41 |
+03:46:37.7 |
HIP 108473 |
27.90 |
| 2026-02-08 12:00 |
22:00:22.52 |
+03:46:46.7 |
HIP 108473 |
28.43 |
| 2026-02-09 00:00 |
22:00:24.64 |
+03:46:55.9 |
HIP 108473 |
28.96 |
| 2026-02-09 12:00 |
22:00:26.76 |
+03:47:05.1 |
HIP 108473 |
29.49 |
| 2026-02-10 00:00 |
22:00:28.88 |
+03:47:14.5 |
HIP 108473 |
30.02 |
| 2026-02-10 12:00 |
22:00:31.01 |
+03:47:23.9 |
HIP 108473 |
30.55 |
| 2026-02-11 00:00 |
22:00:33.13 |
+03:47:33.4 |
HIP 108473 |
31.09 |
| 2026-02-11 12:00 |
22:00:35.26 |
+03:47:43.0 |
HIP 108473 |
31.62 |
| 2026-02-12 00:00 |
22:00:37.39 |
+03:47:52.7 |
HIP 108473 |
32.16 |
| 2026-02-12 12:00 |
22:00:39.52 |
+03:48:02.5 |
HIP 108473 |
32.70 |
| 2026-02-13 00:00 |
22:00:41.65 |
+03:48:12.3 |
HIP 108473 |
33.24 |
| 2026-02-13 12:00 |
22:00:43.79 |
+03:48:22.3 |
HIP 108473 |
33.78 |
| 2026-02-14 00:00 |
22:00:45.92 |
+03:48:32.3 |
HIP 108473 |
34.32 |
| 2026-02-14 12:00 |
22:00:48.06 |
+03:48:42.5 |
HIP 108473 |
34.86 |
| 2026-02-15 00:00 |
22:00:50.19 |
+03:48:52.7 |
HIP 108473 |
35.40 |
| 2026-02-15 12:00 |
22:00:52.33 |
+03:49:03.0 |
HIP 108473 |
35.94 |
| 2026-02-16 00:00 |
22:00:54.47 |
+03:49:13.3 |
HIP 108473 |
36.49 |
| 2026-02-16 12:00 |
22:00:56.60 |
+03:49:23.8 |
HIP 108473 |
37.03 |
| 2026-02-17 00:00 |
22:00:58.74 |
+03:49:34.3 |
HIP 108473 |
37.58 |
| 2026-02-17 12:00 |
22:01:00.88 |
+03:49:44.9 |
HIP 108473 |
38.12 |
| 2026-02-18 00:00 |
22:01:03.01 |
+03:49:55.6 |
HIP 108473 |
38.67 |
| 2026-02-18 12:00 |
22:01:05.15 |
+03:50:06.4 |
HIP 108473 |
39.21 |
| 2026-02-19 00:00 |
22:01:07.28 |
+03:50:17.2 |
HIP 108473 |
39.76 |
| 2026-02-19 12:00 |
22:01:09.42 |
+03:50:28.1 |
HIP 108769 |
39.94 |
| 2026-02-20 00:00 |
22:01:11.55 |
+03:50:39.1 |
HIP 108769 |
39.60 |
| 2026-02-20 12:00 |
22:01:13.69 |
+03:50:50.2 |
HIP 108769 |
39.25 |
| 2026-02-21 00:00 |
22:01:15.82 |
+03:51:01.3 |
HIP 108769 |
38.91 |
| 2026-02-21 12:00 |
22:01:17.95 |
+03:51:12.5 |
HIP 108769 |
38.58 |
| 2026-02-22 00:00 |
22:01:20.08 |
+03:51:23.8 |
HIP 108769 |
38.25 |
| 2026-02-22 12:00 |
22:01:22.20 |
+03:51:35.2 |
HIP 108769 |
37.92 |
| 2026-02-23 00:00 |
22:01:24.33 |
+03:51:46.6 |
HIP 108769 |
37.60 |
| 2026-02-23 12:00 |
22:01:26.45 |
+03:51:58.1 |
HIP 108769 |
37.29 |
| 2026-02-24 00:00 |
22:01:28.57 |
+03:52:09.6 |
HIP 108769 |
36.97 |