メタデータ
| 項目 |
値 |
| Designation |
C/2017 T1 (Heinze) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2018-02-21T16:59:46.164480Z |
| Orbit solution date (soln_date, UTC) |
2019-05-15T15:10:09Z |
| Obs used |
1005 |
| NEO |
- |
| M1 |
11.900 |
| K1 |
14.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2017-12-14.0000000 |
| e |
1.00034579 |
| q (au) |
0.580655 |
| a (au) |
-1679.227553 |
| i (deg) |
96.833756 |
| Ω (om, deg) |
102.315945 |
| ω (w, deg) |
96.916279 |
| M (ma, deg) |
-0.000998 |
等級
散乱 + 全体線形
$$
M_a = (15.769 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.769 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.678 |
| k |
0.867 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2017-09-28 |
2017-12-30 |
-3.8045 |
+0.570 |
| 2017-12-30 |
2018-01-19 |
+22.8569 |
-1.570 |
| 2018-01-19 |
2018-02-21 |
+13.5047 |
-1.217 |
| 2018-02-23 |
2018-04-23 |
+0.3229 |
-0.952 |
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) |
| 2026-09-20 00:00 |
08:06:05.61 |
-77:10:11.0 |
HIP 40081 |
17.74 |
| 2026-09-20 12:00 |
08:06:16.82 |
-77:11:11.8 |
HIP 40081 |
17.41 |
| 2026-09-21 00:00 |
08:06:27.90 |
-77:12:12.9 |
HIP 40081 |
17.16 |
| 2026-09-21 12:00 |
08:06:38.84 |
-77:13:14.3 |
HIP 40081 |
17.01 |
| 2026-09-22 00:00 |
08:06:49.63 |
-77:14:16.0 |
HIP 40081 |
16.95 |
| 2026-09-22 12:00 |
08:07:00.29 |
-77:15:18.0 |
HIP 40081 |
16.98 |
| 2026-09-23 00:00 |
08:07:10.80 |
-77:16:20.3 |
HIP 40081 |
17.11 |
| 2026-09-23 12:00 |
08:07:21.17 |
-77:17:22.9 |
HIP 40081 |
17.33 |
| 2026-09-24 00:00 |
08:07:31.39 |
-77:18:25.8 |
HIP 40081 |
17.64 |
| 2026-09-24 12:00 |
08:07:41.47 |
-77:19:29.0 |
HIP 40081 |
18.03 |
| 2026-09-25 00:00 |
08:07:51.40 |
-77:20:32.4 |
HIP 40081 |
18.50 |
| 2026-09-25 12:00 |
08:08:01.18 |
-77:21:36.1 |
HIP 40081 |
19.04 |
| 2026-09-26 00:00 |
08:08:10.81 |
-77:22:40.1 |
HIP 40081 |
19.64 |
| 2026-09-26 12:00 |
08:08:20.29 |
-77:23:44.3 |
HIP 40081 |
20.31 |
| 2026-09-27 00:00 |
08:08:29.62 |
-77:24:48.9 |
HIP 40081 |
21.03 |
| 2026-09-27 12:00 |
08:08:38.80 |
-77:25:53.6 |
HIP 40081 |
21.81 |
| 2026-09-28 00:00 |
08:08:47.83 |
-77:26:58.7 |
HIP 40081 |
22.62 |
| 2026-09-28 12:00 |
08:08:56.70 |
-77:28:03.9 |
HIP 40081 |
23.48 |
| 2026-09-29 00:00 |
08:09:05.41 |
-77:29:09.5 |
HIP 40081 |
24.37 |
| 2026-09-29 12:00 |
08:09:13.97 |
-77:30:15.3 |
HIP 40081 |
25.29 |
| 2026-09-30 00:00 |
08:09:22.37 |
-77:31:21.3 |
HIP 40081 |
26.24 |
| 2026-09-30 12:00 |
08:09:30.61 |
-77:32:27.6 |
HIP 40081 |
27.21 |
| 2026-10-01 00:00 |
08:09:38.69 |
-77:33:34.1 |
HIP 40021 |
27.93 |
| 2026-10-01 12:00 |
08:09:46.60 |
-77:34:40.8 |
HIP 40021 |
26.78 |
| 2026-10-02 00:00 |
08:09:54.36 |
-77:35:47.7 |
HIP 40021 |
25.64 |
| 2026-10-02 12:00 |
08:10:01.95 |
-77:36:54.9 |
HIP 40021 |
24.50 |
| 2026-10-03 00:00 |
08:10:09.37 |
-77:38:02.3 |
HIP 40021 |
23.36 |
| 2026-10-03 12:00 |
08:10:16.63 |
-77:39:10.0 |
HIP 40021 |
22.23 |
| 2026-10-04 00:00 |
08:10:23.72 |
-77:40:17.8 |
HIP 40021 |
21.09 |
| 2026-10-04 12:00 |
08:10:30.63 |
-77:41:25.9 |
HIP 40021 |
19.96 |
| 2026-10-05 00:00 |
08:10:37.38 |
-77:42:34.1 |
HIP 40021 |
18.83 |
| 2026-10-05 12:00 |
08:10:43.96 |
-77:43:42.6 |
HIP 40021 |
17.71 |
| 2026-10-06 00:00 |
08:10:50.36 |
-77:44:51.2 |
HIP 40021 |
16.59 |
| 2026-10-06 12:00 |
08:10:56.58 |
-77:46:00.0 |
HIP 40021 |
15.48 |
| 2026-10-07 00:00 |
08:11:02.63 |
-77:47:09.1 |
HIP 40021 |
14.37 |
| 2026-10-07 12:00 |
08:11:08.51 |
-77:48:18.3 |
HIP 40021 |
13.28 |
| 2026-10-08 00:00 |
08:11:14.20 |
-77:49:27.6 |
HIP 40021 |
12.20 |
| 2026-10-08 12:00 |
08:11:19.71 |
-77:50:37.2 |
HIP 40021 |
11.14 |
| 2026-10-09 00:00 |
08:11:25.04 |
-77:51:46.9 |
HIP 40021 |
10.11 |
| 2026-10-09 12:00 |
08:11:30.19 |
-77:52:56.8 |
HIP 40021 |
9.10 |
| 2026-10-10 00:00 |
08:11:35.15 |
-77:54:06.9 |
HIP 40021 |
8.14 |
| 2026-10-10 12:00 |
08:11:39.93 |
-77:55:17.0 |
HIP 40021 |
7.25 |
| 2026-10-11 00:00 |
08:11:44.52 |
-77:56:27.4 |
HIP 40021 |
6.44 |