メタデータ
| 項目 |
値 |
| Designation |
C/1984 W2 (Hartley) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1985-09-28T09:29:19.821120Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:31Z |
| Obs used |
53 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1986-02-18.0000000 |
| e |
0.99947295 |
| q (au) |
4.000285 |
| a (au) |
7589.981412 |
| i (deg) |
89.326939 |
| Ω (om, deg) |
250.204076 |
| ω (w, deg) |
255.271872 |
| M (ma, deg) |
0.000213 |
等級
散乱 + 全体線形
$$
M_a = (4.937 + 4.665\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
4.937 |
| n |
4.665 |
| gf |
0.993 |
| gb |
-0.502 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
17:04:32.13 |
+24:05:36.3 |
HIP 83714 |
28.88 |
| 2026-05-12 12:00 |
17:04:30.30 |
+24:05:48.5 |
HIP 83375 |
28.48 |
| 2026-05-13 00:00 |
17:04:28.47 |
+24:06:00.6 |
HIP 83375 |
28.07 |
| 2026-05-13 12:00 |
17:04:26.63 |
+24:06:12.5 |
HIP 83375 |
27.65 |
| 2026-05-14 00:00 |
17:04:24.78 |
+24:06:24.2 |
HIP 83375 |
27.24 |
| 2026-05-14 12:00 |
17:04:22.93 |
+24:06:35.8 |
HIP 83375 |
26.83 |
| 2026-05-15 00:00 |
17:04:21.07 |
+24:06:47.2 |
HIP 83375 |
26.41 |
| 2026-05-15 12:00 |
17:04:19.20 |
+24:06:58.5 |
HIP 83375 |
26.00 |
| 2026-05-16 00:00 |
17:04:17.32 |
+24:07:09.6 |
HIP 83375 |
25.58 |
| 2026-05-16 12:00 |
17:04:15.44 |
+24:07:20.6 |
HIP 83375 |
25.17 |
| 2026-05-17 00:00 |
17:04:13.55 |
+24:07:31.3 |
HIP 83375 |
24.76 |
| 2026-05-17 12:00 |
17:04:11.65 |
+24:07:42.0 |
HIP 83375 |
24.34 |
| 2026-05-18 00:00 |
17:04:09.75 |
+24:07:52.5 |
HIP 83375 |
23.93 |
| 2026-05-18 12:00 |
17:04:07.84 |
+24:08:02.8 |
HIP 83375 |
23.52 |
| 2026-05-19 00:00 |
17:04:05.93 |
+24:08:12.9 |
HIP 83375 |
23.10 |
| 2026-05-19 12:00 |
17:04:04.01 |
+24:08:22.9 |
HIP 83375 |
22.69 |
| 2026-05-20 00:00 |
17:04:02.08 |
+24:08:32.7 |
HIP 83375 |
22.28 |
| 2026-05-20 12:00 |
17:04:00.15 |
+24:08:42.4 |
HIP 83375 |
21.87 |
| 2026-05-21 00:00 |
17:03:58.21 |
+24:08:51.9 |
HIP 83375 |
21.46 |
| 2026-05-21 12:00 |
17:03:56.27 |
+24:09:01.2 |
HIP 83375 |
21.05 |
| 2026-05-22 00:00 |
17:03:54.32 |
+24:09:10.3 |
HIP 83375 |
20.64 |
| 2026-05-22 12:00 |
17:03:52.37 |
+24:09:19.3 |
HIP 83375 |
20.23 |
| 2026-05-23 00:00 |
17:03:50.41 |
+24:09:28.2 |
HIP 83375 |
19.82 |
| 2026-05-23 12:00 |
17:03:48.45 |
+24:09:36.8 |
HIP 83375 |
19.42 |
| 2026-05-24 00:00 |
17:03:46.49 |
+24:09:45.3 |
HIP 83375 |
19.02 |
| 2026-05-24 12:00 |
17:03:44.52 |
+24:09:53.6 |
HIP 83375 |
18.61 |
| 2026-05-25 00:00 |
17:03:42.54 |
+24:10:01.8 |
HIP 83375 |
18.21 |
| 2026-05-25 12:00 |
17:03:40.56 |
+24:10:09.8 |
HIP 83375 |
17.81 |
| 2026-05-26 00:00 |
17:03:38.58 |
+24:10:17.6 |
HIP 83375 |
17.42 |
| 2026-05-26 12:00 |
17:03:36.59 |
+24:10:25.3 |
HIP 83375 |
17.02 |
| 2026-05-27 00:00 |
17:03:34.60 |
+24:10:32.7 |
HIP 83375 |
16.63 |
| 2026-05-27 12:00 |
17:03:32.61 |
+24:10:40.1 |
HIP 83375 |
16.24 |
| 2026-05-28 00:00 |
17:03:30.61 |
+24:10:47.2 |
HIP 83375 |
15.85 |
| 2026-05-28 12:00 |
17:03:28.61 |
+24:10:54.2 |
HIP 83375 |
15.47 |
| 2026-05-29 00:00 |
17:03:26.61 |
+24:11:01.0 |
HIP 83375 |
15.09 |
| 2026-05-29 12:00 |
17:03:24.60 |
+24:11:07.6 |
HIP 83375 |
14.71 |
| 2026-05-30 00:00 |
17:03:22.59 |
+24:11:14.1 |
HIP 83375 |
14.33 |
| 2026-05-30 12:00 |
17:03:20.58 |
+24:11:20.4 |
HIP 83375 |
13.96 |
| 2026-05-31 00:00 |
17:03:18.57 |
+24:11:26.5 |
HIP 83375 |
13.60 |
| 2026-05-31 12:00 |
17:03:16.55 |
+24:11:32.4 |
HIP 83375 |
13.24 |
| 2026-06-01 00:00 |
17:03:14.54 |
+24:11:38.2 |
HIP 83375 |
12.88 |
| 2026-06-01 12:00 |
17:03:12.52 |
+24:11:43.8 |
HIP 83375 |
12.53 |
| 2026-06-02 00:00 |
17:03:10.49 |
+24:11:49.2 |
HIP 83375 |
12.19 |