メタデータ
| 項目 |
値 |
| Designation |
161P/Hartley-IRAS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2005-06-20T20:24:46.189440Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:27:43Z |
| Obs used |
335 |
| NEO |
Yes |
| M1 |
11.500 |
| K1 |
11.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2004-07-04.0000000 |
| e |
0.83508810 |
| q (au) |
1.274829 |
| a (au) |
7.730366 |
| i (deg) |
95.698050 |
| Ω (om, deg) |
1.398165 |
| ω (w, deg) |
47.091452 |
| M (ma, deg) |
343.865252 |
等級
散乱 + 全体線形
$$
M_a = (9.254 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.254 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.998 |
| k |
1.000 |
| δ90 |
10.000 |
| 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
02:52:30.03 |
-25:44:39.2 |
HIP 13489 |
29.37 |
| 2026-06-01 12:00 |
02:52:51.96 |
-25:40:07.5 |
HIP 13489 |
31.21 |
| 2026-06-02 00:00 |
02:53:13.84 |
-25:35:37.4 |
HIP 13489 |
34.26 |
| 2026-06-02 12:00 |
02:53:35.67 |
-25:31:08.8 |
HIP 13626 |
28.77 |
| 2026-06-03 00:00 |
02:53:57.46 |
-25:26:41.7 |
HIP 13626 |
22.45 |
| 2026-06-03 12:00 |
02:54:19.20 |
-25:22:16.2 |
HIP 13626 |
16.40 |
| 2026-06-04 00:00 |
02:54:40.88 |
-25:17:52.2 |
HIP 13610 |
10.49 |
| 2026-06-04 12:00 |
02:55:02.52 |
-25:13:29.7 |
HIP 13610 |
4.63 |
| 2026-06-05 00:00 |
02:55:24.10 |
-25:09:08.7 |
HIP 13610 |
4.33 |
| 2026-06-05 12:00 |
02:55:45.63 |
-25:04:49.3 |
HIP 13610 |
10.05 |
| 2026-06-06 00:00 |
02:56:07.11 |
-25:00:31.4 |
HIP 13769 |
15.11 |
| 2026-06-06 12:00 |
02:56:28.53 |
-24:56:15.0 |
HIP 13769 |
10.37 |
| 2026-06-07 00:00 |
02:56:49.89 |
-24:52:00.2 |
HIP 13772 |
8.34 |
| 2026-06-07 12:00 |
02:57:11.19 |
-24:47:46.9 |
HIP 13772 |
10.41 |
| 2026-06-08 00:00 |
02:57:32.43 |
-24:43:35.1 |
HIP 13772 |
15.12 |
| 2026-06-08 12:00 |
02:57:53.61 |
-24:39:24.9 |
HIP 13772 |
20.73 |
| 2026-06-09 00:00 |
02:58:14.72 |
-24:35:16.2 |
HIP 13772 |
26.64 |
| 2026-06-09 12:00 |
02:58:35.77 |
-24:31:09.1 |
HIP 13772 |
32.69 |
| 2026-06-10 00:00 |
02:58:56.76 |
-24:27:03.5 |
HIP 13696 |
36.14 |
| 2026-06-10 12:00 |
02:59:17.67 |
-24:22:59.4 |
HIP 14072 |
35.66 |
| 2026-06-11 00:00 |
02:59:38.52 |
-24:18:56.9 |
HIP 14072 |
29.43 |
| 2026-06-11 12:00 |
02:59:59.29 |
-24:14:56.0 |
HIP 14072 |
23.22 |
| 2026-06-12 00:00 |
03:00:19.99 |
-24:10:56.6 |
HIP 14072 |
17.05 |
| 2026-06-12 12:00 |
03:00:40.62 |
-24:06:58.7 |
HIP 14072 |
10.92 |
| 2026-06-13 00:00 |
03:01:01.17 |
-24:03:02.5 |
HIP 14072 |
4.86 |
| 2026-06-13 12:00 |
03:01:21.64 |
-23:59:07.7 |
HIP 14072 |
1.69 |
| 2026-06-14 00:00 |
03:01:42.03 |
-23:55:14.6 |
HIP 14072 |
7.48 |
| 2026-06-14 12:00 |
03:02:02.33 |
-23:51:23.0 |
HIP 14130 |
3.79 |
| 2026-06-15 00:00 |
03:02:22.56 |
-23:47:32.9 |
HIP 14130 |
2.30 |
| 2026-06-15 12:00 |
03:02:42.69 |
-23:43:44.4 |
HIP 14146 |
7.65 |
| 2026-06-16 00:00 |
03:03:02.74 |
-23:39:57.4 |
HIP 14146 |
9.31 |
| 2026-06-16 12:00 |
03:03:22.70 |
-23:36:12.1 |
HIP 14146 |
13.60 |
| 2026-06-17 00:00 |
03:03:42.56 |
-23:32:28.2 |
HIP 14146 |
18.77 |
| 2026-06-17 12:00 |
03:04:02.33 |
-23:28:45.9 |
HIP 14290 |
20.30 |
| 2026-06-18 00:00 |
03:04:22.00 |
-23:25:05.2 |
HIP 14290 |
16.59 |
| 2026-06-18 12:00 |
03:04:41.58 |
-23:21:25.9 |
HIP 14388 |
14.21 |
| 2026-06-19 00:00 |
03:05:01.06 |
-23:17:48.3 |
HIP 14388 |
13.10 |
| 2026-06-19 12:00 |
03:05:20.43 |
-23:14:12.1 |
HIP 14388 |
14.39 |
| 2026-06-20 00:00 |
03:05:39.70 |
-23:10:37.5 |
HIP 14452 |
15.44 |
| 2026-06-20 12:00 |
03:05:58.86 |
-23:07:04.4 |
HIP 14452 |
15.16 |
| 2026-06-21 00:00 |
03:06:17.92 |
-23:03:32.9 |
HIP 14452 |
16.87 |
| 2026-06-21 12:00 |
03:06:36.87 |
-23:00:02.8 |
HIP 14452 |
20.04 |
| 2026-06-22 00:00 |
03:06:55.71 |
-22:56:34.3 |
HIP 14452 |
24.07 |