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) |
| 2026-03-26 00:00 |
06:32:16.00 |
-79:11:28.6 |
HIP 30837 |
20.03 |
| 2026-03-26 12:00 |
06:32:14.98 |
-79:10:05.9 |
HIP 30837 |
18.84 |
| 2026-03-27 00:00 |
06:32:14.22 |
-79:08:43.1 |
HIP 30837 |
17.69 |
| 2026-03-27 12:00 |
06:32:13.70 |
-79:07:20.3 |
HIP 30837 |
16.57 |
| 2026-03-28 00:00 |
06:32:13.43 |
-79:05:57.5 |
HIP 30837 |
15.51 |
| 2026-03-28 12:00 |
06:32:13.40 |
-79:04:34.7 |
HIP 30837 |
14.52 |
| 2026-03-29 00:00 |
06:32:13.62 |
-79:03:11.9 |
HIP 30837 |
13.59 |
| 2026-03-29 12:00 |
06:32:14.08 |
-79:01:49.1 |
HIP 30837 |
12.76 |
| 2026-03-30 00:00 |
06:32:14.78 |
-79:00:26.3 |
HIP 30837 |
12.04 |
| 2026-03-30 12:00 |
06:32:15.72 |
-78:59:03.6 |
HIP 30837 |
11.46 |
| 2026-03-31 00:00 |
06:32:16.90 |
-78:57:40.8 |
HIP 30837 |
11.02 |
| 2026-03-31 12:00 |
06:32:18.31 |
-78:56:18.1 |
HIP 30837 |
10.76 |
| 2026-04-01 00:00 |
06:32:19.95 |
-78:54:55.4 |
HIP 30837 |
10.69 |
| 2026-04-01 12:00 |
06:32:21.82 |
-78:53:32.8 |
HIP 30837 |
10.80 |
| 2026-04-02 00:00 |
06:32:23.93 |
-78:52:10.2 |
HIP 30837 |
11.10 |
| 2026-04-02 12:00 |
06:32:26.26 |
-78:50:47.6 |
HIP 30837 |
11.57 |
| 2026-04-03 00:00 |
06:32:28.82 |
-78:49:25.1 |
HIP 30837 |
12.18 |
| 2026-04-03 12:00 |
06:32:31.60 |
-78:48:02.7 |
HIP 30837 |
12.92 |
| 2026-04-04 00:00 |
06:32:34.61 |
-78:46:40.3 |
HIP 30837 |
13.78 |
| 2026-04-04 12:00 |
06:32:37.84 |
-78:45:18.0 |
HIP 30837 |
14.72 |
| 2026-04-05 00:00 |
06:32:41.28 |
-78:43:55.8 |
HIP 30837 |
15.73 |
| 2026-04-05 12:00 |
06:32:44.95 |
-78:42:33.6 |
HIP 30837 |
16.80 |
| 2026-04-06 00:00 |
06:32:48.84 |
-78:41:11.6 |
HIP 30837 |
17.92 |
| 2026-04-06 12:00 |
06:32:52.94 |
-78:39:49.6 |
HIP 30837 |
19.08 |
| 2026-04-07 00:00 |
06:32:57.25 |
-78:38:27.7 |
HIP 30837 |
20.28 |
| 2026-04-07 12:00 |
06:33:01.78 |
-78:37:05.9 |
HIP 30837 |
21.50 |
| 2026-04-08 00:00 |
06:33:06.52 |
-78:35:44.3 |
HIP 31861 |
21.60 |
| 2026-04-08 12:00 |
06:33:11.46 |
-78:34:22.7 |
HIP 31861 |
20.84 |
| 2026-04-09 00:00 |
06:33:16.62 |
-78:33:01.3 |
HIP 31861 |
20.13 |
| 2026-04-09 12:00 |
06:33:21.98 |
-78:31:39.9 |
HIP 31861 |
19.49 |
| 2026-04-10 00:00 |
06:33:27.55 |
-78:30:18.7 |
HIP 31861 |
18.92 |
| 2026-04-10 12:00 |
06:33:33.32 |
-78:28:57.7 |
HIP 31861 |
18.42 |
| 2026-04-11 00:00 |
06:33:39.29 |
-78:27:36.7 |
HIP 31861 |
18.00 |
| 2026-04-11 12:00 |
06:33:45.46 |
-78:26:15.9 |
HIP 31861 |
17.67 |
| 2026-04-12 00:00 |
06:33:51.83 |
-78:24:55.3 |
HIP 31861 |
17.43 |
| 2026-04-12 12:00 |
06:33:58.40 |
-78:23:34.8 |
HIP 31861 |
17.29 |
| 2026-04-13 00:00 |
06:34:05.16 |
-78:22:14.4 |
HIP 31861 |
17.25 |
| 2026-04-13 12:00 |
06:34:12.12 |
-78:20:54.3 |
HIP 31861 |
17.30 |
| 2026-04-14 00:00 |
06:34:19.27 |
-78:19:34.2 |
HIP 31861 |
17.46 |
| 2026-04-14 12:00 |
06:34:26.61 |
-78:18:14.4 |
HIP 31861 |
17.71 |
| 2026-04-15 00:00 |
06:34:34.14 |
-78:16:54.7 |
HIP 31861 |
18.05 |
| 2026-04-15 12:00 |
06:34:41.86 |
-78:15:35.2 |
HIP 31861 |
18.47 |
| 2026-04-16 00:00 |
06:34:49.77 |
-78:14:15.9 |
HIP 31861 |
18.98 |