メタデータ
| 項目 |
値 |
| Designation |
27P/Crommelin |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2011-08-02T13:37:41.877120Z |
| Orbit solution date (soln_date, UTC) |
2023-05-12T09:58:07Z |
| Obs used |
455 |
| NEO |
Yes |
| M1 |
12.700 |
| K1 |
27.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2002-08-03.0000000 |
| e |
0.91925987 |
| q (au) |
0.734210 |
| a (au) |
9.093497 |
| i (deg) |
29.221115 |
| Ω (om, deg) |
250.959353 |
| ω (w, deg) |
195.955445 |
| M (ma, deg) |
241.872697 |
等級
散乱 + 全体線形
$$
M_a = (15.302 + 5.211\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.302 |
| n |
5.211 |
| gf |
0.998 |
| gb |
-1.000 |
| k |
0.842 |
| δ90 |
9.969 |
| 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 |
| 2011-05-12 |
2011-07-25 |
+11.1741 |
-1.084 |
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 |
17:46:25.05 |
-14:35:40.0 |
HIP 86988 |
10.00 |
| 2026-06-01 12:00 |
17:46:18.57 |
-14:35:29.7 |
HIP 86988 |
10.60 |
| 2026-06-02 00:00 |
17:46:12.06 |
-14:35:19.5 |
HIP 86988 |
11.39 |
| 2026-06-02 12:00 |
17:46:05.53 |
-14:35:09.3 |
HIP 86988 |
12.34 |
| 2026-06-03 00:00 |
17:45:58.99 |
-14:34:59.3 |
HIP 86988 |
13.41 |
| 2026-06-03 12:00 |
17:45:52.42 |
-14:34:49.4 |
HIP 86988 |
14.57 |
| 2026-06-04 00:00 |
17:45:45.85 |
-14:34:39.6 |
HIP 86988 |
15.81 |
| 2026-06-04 12:00 |
17:45:39.25 |
-14:34:30.0 |
HIP 86988 |
17.12 |
| 2026-06-05 00:00 |
17:45:32.64 |
-14:34:20.4 |
HIP 86988 |
18.47 |
| 2026-06-05 12:00 |
17:45:26.01 |
-14:34:11.0 |
HIP 86988 |
19.87 |
| 2026-06-06 00:00 |
17:45:19.37 |
-14:34:01.6 |
HIP 86988 |
21.29 |
| 2026-06-06 12:00 |
17:45:12.72 |
-14:33:52.4 |
HIP 86988 |
22.74 |
| 2026-06-07 00:00 |
17:45:06.05 |
-14:33:43.3 |
HIP 86988 |
24.22 |
| 2026-06-07 12:00 |
17:44:59.37 |
-14:33:34.3 |
HIP 86988 |
25.71 |
| 2026-06-08 00:00 |
17:44:52.68 |
-14:33:25.5 |
HIP 86988 |
27.23 |
| 2026-06-08 12:00 |
17:44:45.97 |
-14:33:16.7 |
HIP 86988 |
28.75 |
| 2026-06-09 00:00 |
17:44:39.26 |
-14:33:08.1 |
HIP 86988 |
30.29 |
| 2026-06-09 12:00 |
17:44:32.53 |
-14:32:59.6 |
HIP 86988 |
31.84 |
| 2026-06-10 00:00 |
17:44:25.79 |
-14:32:51.2 |
HIP 86988 |
33.40 |
| 2026-06-10 12:00 |
17:44:19.05 |
-14:32:42.9 |
HIP 86988 |
34.96 |
| 2026-06-11 00:00 |
17:44:12.29 |
-14:32:34.8 |
HIP 86988 |
36.54 |
| 2026-06-11 12:00 |
17:44:05.53 |
-14:32:26.8 |
HIP 86988 |
38.12 |
| 2026-06-12 00:00 |
17:43:58.76 |
-14:32:18.8 |
HIP 86988 |
39.71 |
| 2026-06-12 12:00 |
17:43:51.98 |
-14:32:11.1 |
HIP 86988 |
41.30 |
| 2026-06-13 00:00 |
17:43:45.20 |
-14:32:03.4 |
HIP 86988 |
42.90 |
| 2026-06-13 12:00 |
17:43:38.41 |
-14:31:55.9 |
HIP 86524 |
43.15 |
| 2026-06-14 00:00 |
17:43:31.61 |
-14:31:48.4 |
HIP 86524 |
41.59 |
| 2026-06-14 12:00 |
17:43:24.81 |
-14:31:41.1 |
HIP 86524 |
40.03 |
| 2026-06-15 00:00 |
17:43:18.01 |
-14:31:34.0 |
HIP 86524 |
38.48 |
| 2026-06-15 12:00 |
17:43:11.20 |
-14:31:26.9 |
HIP 86524 |
36.93 |
| 2026-06-16 00:00 |
17:43:04.39 |
-14:31:20.0 |
HIP 86524 |
35.40 |
| 2026-06-16 12:00 |
17:42:57.58 |
-14:31:13.2 |
HIP 86524 |
33.88 |
| 2026-06-17 00:00 |
17:42:50.77 |
-14:31:06.6 |
HIP 86524 |
32.38 |
| 2026-06-17 12:00 |
17:42:43.96 |
-14:31:00.0 |
HIP 86524 |
30.89 |
| 2026-06-18 00:00 |
17:42:37.14 |
-14:30:53.6 |
HIP 86524 |
29.42 |
| 2026-06-18 12:00 |
17:42:30.33 |
-14:30:47.3 |
HIP 86524 |
27.97 |
| 2026-06-19 00:00 |
17:42:23.52 |
-14:30:41.1 |
HIP 86524 |
26.54 |
| 2026-06-19 12:00 |
17:42:16.71 |
-14:30:35.1 |
HIP 86524 |
25.15 |
| 2026-06-20 00:00 |
17:42:09.91 |
-14:30:29.2 |
HIP 86524 |
23.79 |
| 2026-06-20 12:00 |
17:42:03.11 |
-14:30:23.4 |
HIP 86524 |
22.47 |
| 2026-06-21 00:00 |
17:41:56.31 |
-14:30:17.8 |
HIP 86524 |
21.20 |
| 2026-06-21 12:00 |
17:41:49.51 |
-14:30:12.2 |
HIP 86524 |
19.98 |
| 2026-06-22 00:00 |
17:41:42.72 |
-14:30:06.8 |
HIP 86524 |
18.84 |