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
$$
M_a = (6.727 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
6.727 |
| n |
6.000 |
| gf |
0.983 |
| gb |
-0.986 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
08:25:12.80 |
+24:00:17.1 |
HIP 41244 |
5.36 |
| 2026-07-29 12:00 |
08:25:44.07 |
+23:58:37.9 |
HIP 41244 |
11.32 |
| 2026-07-30 00:00 |
08:26:15.32 |
+23:56:58.4 |
HIP 41244 |
18.30 |
| 2026-07-30 12:00 |
08:26:46.56 |
+23:55:18.8 |
HIP 41244 |
25.48 |
| 2026-07-31 00:00 |
08:27:17.79 |
+23:53:39.0 |
HIP 41574 |
23.50 |
| 2026-07-31 12:00 |
08:27:49.00 |
+23:51:59.0 |
HIP 41574 |
19.97 |
| 2026-08-01 00:00 |
08:28:20.19 |
+23:50:18.9 |
HIP 41574 |
18.78 |
| 2026-08-01 12:00 |
08:28:51.36 |
+23:48:38.6 |
HIP 41574 |
20.33 |
| 2026-08-02 00:00 |
08:29:22.51 |
+23:46:58.1 |
HIP 41574 |
24.11 |
| 2026-08-02 12:00 |
08:29:53.65 |
+23:45:17.4 |
HIP 41743 |
19.94 |
| 2026-08-03 00:00 |
08:30:24.77 |
+23:43:36.6 |
HIP 41743 |
15.17 |
| 2026-08-03 12:00 |
08:30:55.87 |
+23:41:55.6 |
HIP 41743 |
13.04 |
| 2026-08-04 00:00 |
08:31:26.94 |
+23:40:14.4 |
HIP 41883 |
13.87 |
| 2026-08-04 12:00 |
08:31:58.00 |
+23:38:33.1 |
HIP 41883 |
8.66 |
| 2026-08-05 00:00 |
08:32:29.04 |
+23:36:51.6 |
HIP 41883 |
8.01 |
| 2026-08-05 12:00 |
08:33:00.05 |
+23:35:10.0 |
HIP 41883 |
12.65 |
| 2026-08-06 00:00 |
08:33:31.04 |
+23:33:28.3 |
HIP 41883 |
19.04 |
| 2026-08-06 12:00 |
08:34:02.01 |
+23:31:46.3 |
HIP 41883 |
25.91 |
| 2026-08-07 00:00 |
08:34:32.96 |
+23:30:04.3 |
HIP 42053 |
28.70 |
| 2026-08-07 12:00 |
08:35:03.88 |
+23:28:22.1 |
HIP 42253 |
29.05 |
| 2026-08-08 00:00 |
08:35:34.78 |
+23:26:39.8 |
HIP 42253 |
22.06 |
| 2026-08-08 12:00 |
08:36:05.65 |
+23:24:57.3 |
HIP 42253 |
15.35 |
| 2026-08-09 00:00 |
08:36:36.49 |
+23:23:14.8 |
HIP 42253 |
9.53 |
| 2026-08-09 12:00 |
08:37:07.31 |
+23:21:32.0 |
HIP 42253 |
7.22 |
| 2026-08-10 00:00 |
08:37:38.11 |
+23:19:49.2 |
HIP 42253 |
10.92 |
| 2026-08-10 12:00 |
08:38:08.87 |
+23:18:06.3 |
HIP 42253 |
17.09 |
| 2026-08-11 00:00 |
08:38:39.61 |
+23:16:23.2 |
HIP 42303 |
23.53 |
| 2026-08-11 12:00 |
08:39:10.31 |
+23:14:40.1 |
HIP 42443 |
26.28 |
| 2026-08-12 00:00 |
08:39:40.99 |
+23:12:56.8 |
HIP 42443 |
25.29 |
| 2026-08-12 12:00 |
08:40:11.63 |
+23:11:13.5 |
HIP 42443 |
26.34 |
| 2026-08-13 00:00 |
08:40:42.25 |
+23:09:30.0 |
HIP 42443 |
29.20 |
| 2026-08-13 12:00 |
08:41:12.83 |
+23:07:46.5 |
HIP 42443 |
33.42 |
| 2026-08-14 00:00 |
08:41:43.38 |
+23:06:02.9 |
HIP 42840 |
36.50 |
| 2026-08-14 12:00 |
08:42:13.89 |
+23:04:19.2 |
HIP 42840 |
30.15 |
| 2026-08-15 00:00 |
08:42:44.37 |
+23:02:35.4 |
HIP 42840 |
24.30 |
| 2026-08-15 12:00 |
08:43:14.82 |
+23:00:51.6 |
HIP 42840 |
19.40 |
| 2026-08-16 00:00 |
08:43:45.23 |
+22:59:07.6 |
HIP 42840 |
16.33 |
| 2026-08-16 12:00 |
08:44:15.61 |
+22:57:23.7 |
HIP 42840 |
16.15 |
| 2026-08-17 00:00 |
08:44:45.94 |
+22:55:39.6 |
HIP 42840 |
18.94 |
| 2026-08-17 12:00 |
08:45:16.24 |
+22:53:55.5 |
HIP 42840 |
23.67 |
| 2026-08-18 00:00 |
08:45:46.51 |
+22:52:11.4 |
HIP 43171 |
28.46 |
| 2026-08-18 12:00 |
08:46:16.73 |
+22:50:27.2 |
HIP 43171 |
23.60 |
| 2026-08-19 00:00 |
08:46:46.92 |
+22:48:42.9 |
HIP 43171 |
20.16 |