メタデータ
| 項目 |
値 |
| Designation |
74P/Smirnova-Chernykh |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2009-07-26T18:53:38.227200Z |
| Orbit solution date (soln_date, UTC) |
2026-03-07T15:24:14Z |
| Obs used |
6028 |
| NEO |
- |
| M1 |
6.700 |
| K1 |
14.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2013-01-30.0000000 |
| e |
0.14785301 |
| q (au) |
3.549250 |
| a (au) |
4.165067 |
| i (deg) |
6.651004 |
| Ω (om, deg) |
77.083800 |
| ω (w, deg) |
86.558859 |
| M (ma, deg) |
148.788615 |
等級
散乱 + 全体線形
$$
M_a = (6.747 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
6.747 |
| n |
6.000 |
| gf |
0.904 |
| gb |
-0.986 |
| k |
1.000 |
| δ90 |
1.005 |
| 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) |
| 2026-05-12 00:00 |
07:07:40.42 |
+27:21:54.2 |
HIP 34522 |
25.22 |
| 2026-05-12 12:00 |
07:08:05.83 |
+27:21:00.7 |
HIP 34522 |
21.60 |
| 2026-05-13 00:00 |
07:08:31.34 |
+27:20:06.9 |
HIP 34522 |
19.02 |
| 2026-05-13 12:00 |
07:08:56.96 |
+27:19:12.8 |
HIP 34522 |
17.96 |
| 2026-05-14 00:00 |
07:09:22.67 |
+27:18:18.4 |
HIP 34522 |
18.71 |
| 2026-05-14 12:00 |
07:09:48.49 |
+27:17:23.7 |
HIP 34522 |
21.08 |
| 2026-05-15 00:00 |
07:10:14.40 |
+27:16:28.8 |
HIP 34522 |
24.64 |
| 2026-05-15 12:00 |
07:10:40.41 |
+27:15:33.5 |
HIP 34799 |
23.21 |
| 2026-05-16 00:00 |
07:11:06.51 |
+27:14:37.9 |
HIP 34799 |
18.80 |
| 2026-05-16 12:00 |
07:11:32.72 |
+27:13:42.0 |
HIP 34799 |
15.39 |
| 2026-05-17 00:00 |
07:11:59.01 |
+27:12:45.8 |
HIP 34860 |
11.16 |
| 2026-05-17 12:00 |
07:12:25.40 |
+27:11:49.4 |
HIP 34860 |
5.53 |
| 2026-05-18 00:00 |
07:12:51.88 |
+27:10:52.6 |
HIP 34860 |
2.70 |
| 2026-05-18 12:00 |
07:13:18.45 |
+27:09:55.5 |
HIP 34860 |
7.45 |
| 2026-05-19 00:00 |
07:13:45.11 |
+27:08:58.1 |
HIP 34860 |
13.26 |
| 2026-05-19 12:00 |
07:14:11.86 |
+27:08:00.3 |
HIP 34860 |
19.21 |
| 2026-05-20 00:00 |
07:14:38.70 |
+27:07:02.3 |
HIP 35191 |
22.55 |
| 2026-05-20 12:00 |
07:15:05.62 |
+27:06:04.0 |
HIP 35191 |
16.70 |
| 2026-05-21 00:00 |
07:15:32.63 |
+27:05:05.4 |
HIP 35191 |
11.06 |
| 2026-05-21 12:00 |
07:15:59.73 |
+27:04:06.4 |
HIP 35191 |
6.32 |
| 2026-05-22 00:00 |
07:16:26.90 |
+27:03:07.2 |
HIP 35191 |
5.68 |
| 2026-05-22 12:00 |
07:16:54.16 |
+27:02:07.6 |
HIP 35191 |
10.01 |
| 2026-05-23 00:00 |
07:17:21.50 |
+27:01:07.7 |
HIP 35191 |
15.62 |
| 2026-05-23 12:00 |
07:17:48.92 |
+27:00:07.6 |
HIP 35377 |
17.48 |
| 2026-05-24 00:00 |
07:18:16.42 |
+26:59:07.1 |
HIP 35377 |
16.31 |
| 2026-05-24 12:00 |
07:18:44.00 |
+26:58:06.3 |
HIP 35494 |
13.60 |
| 2026-05-25 00:00 |
07:19:11.65 |
+26:57:05.1 |
HIP 35494 |
8.81 |
| 2026-05-25 12:00 |
07:19:39.38 |
+26:56:03.7 |
HIP 35494 |
6.96 |
| 2026-05-26 00:00 |
07:20:07.19 |
+26:55:02.0 |
HIP 35494 |
9.90 |
| 2026-05-26 12:00 |
07:20:35.07 |
+26:53:59.9 |
HIP 35494 |
15.06 |
| 2026-05-27 00:00 |
07:21:03.02 |
+26:52:57.5 |
HIP 35659 |
12.52 |
| 2026-05-27 12:00 |
07:21:31.05 |
+26:51:54.8 |
HIP 35659 |
12.23 |
| 2026-05-28 00:00 |
07:21:59.14 |
+26:50:51.8 |
HIP 35659 |
14.92 |
| 2026-05-28 12:00 |
07:22:27.31 |
+26:49:48.5 |
HIP 35659 |
19.42 |
| 2026-05-29 00:00 |
07:22:55.55 |
+26:48:44.8 |
HIP 35659 |
24.77 |
| 2026-05-29 12:00 |
07:23:23.86 |
+26:47:40.9 |
HIP 35967 |
21.42 |
| 2026-05-30 00:00 |
07:23:52.23 |
+26:46:36.6 |
HIP 35967 |
15.45 |
| 2026-05-30 12:00 |
07:24:20.68 |
+26:45:32.0 |
HIP 35967 |
10.05 |
| 2026-05-31 00:00 |
07:24:49.19 |
+26:44:27.0 |
HIP 35967 |
6.80 |
| 2026-05-31 12:00 |
07:25:17.76 |
+26:43:21.8 |
HIP 35967 |
8.67 |
| 2026-06-01 00:00 |
07:25:46.40 |
+26:42:16.2 |
HIP 35967 |
13.72 |
| 2026-06-01 12:00 |
07:26:15.11 |
+26:41:10.3 |
HIP 35967 |
19.65 |
| 2026-06-02 00:00 |
07:26:43.88 |
+26:40:04.1 |
HIP 35967 |
25.87 |