C/2021 T2 (Fuls)
메타데이터
| 항목 |
값 |
| Designation |
C/2021 T2 (Fuls) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2022-06-07T21:34:39.907200Z |
| Orbit solution date (soln_date, UTC) |
2023-01-14T00:13:00Z |
| Obs used |
183 |
| NEO |
- |
| M1 |
15.300 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2021-10-02T09:01:40.224000Z |
| Discovery magnitude (MPC) |
19.87 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2021-11-13.0000000 |
| e |
1.00014284 |
| q (au) |
1.247719 |
| a (au) |
-8734.775296 |
| i (deg) |
117.526989 |
| Ω (om, deg) |
223.231185 |
| ω (w, deg) |
263.592510 |
| M (ma, deg) |
-0.000250 |
밝기
산란 + 전체 선형
$$
M_a = (17.173 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
17.173 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.684 |
| k |
0.800 |
| δ90 |
10.000 |
| 파라미터 |
기호 |
범위 |
설명 |
| 태양·지구거리 1 AU에서의 절대등급 |
H0 |
-5 to 20 |
혜성의 고유 밝기 |
| 광도 기울기 파라미터 |
n |
2 to 6 |
태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 |
gf |
0.8 to 1 |
전방 산란의 강도 |
| 후방 산란 비대칭 계수 |
gb |
-1 to -0.5 |
후방 산란의 강도 |
| 분할 계수 |
k |
0.8 to 1 |
전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 |
δ90 |
1 to 10 |
코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (UTC) |
a |
b |
| 2021-10-02 |
2021-12-30 |
-2.9591 |
+1.412 |
| 2021-12-30 |
2022-02-25 |
-19.1448 |
+7.461 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
14:30:01.24 |
+29:02:36.8 |
HIP 70738 |
29.83 |
| 2026-02-03 12:00 |
14:30:00.00 |
+29:04:43.0 |
HIP 70738 |
28.70 |
| 2026-02-04 00:00 |
14:29:58.66 |
+29:06:49.5 |
HIP 70738 |
27.67 |
| 2026-02-04 12:00 |
14:29:57.23 |
+29:08:56.3 |
HIP 70835 |
25.63 |
| 2026-02-05 00:00 |
14:29:55.70 |
+29:11:03.4 |
HIP 70835 |
23.57 |
| 2026-02-05 12:00 |
14:29:54.07 |
+29:13:10.7 |
HIP 70835 |
21.51 |
| 2026-02-06 00:00 |
14:29:52.35 |
+29:15:18.2 |
HIP 70835 |
19.46 |
| 2026-02-06 12:00 |
14:29:50.53 |
+29:17:26.1 |
HIP 70835 |
17.41 |
| 2026-02-07 00:00 |
14:29:48.61 |
+29:19:34.1 |
HIP 70835 |
15.39 |
| 2026-02-07 12:00 |
14:29:46.60 |
+29:21:42.4 |
HIP 70835 |
13.40 |
| 2026-02-08 00:00 |
14:29:44.49 |
+29:23:50.9 |
HIP 70835 |
11.46 |
| 2026-02-08 12:00 |
14:29:42.28 |
+29:25:59.6 |
HIP 70835 |
9.61 |
| 2026-02-09 00:00 |
14:29:39.97 |
+29:28:08.5 |
HIP 70835 |
7.92 |
| 2026-02-09 12:00 |
14:29:37.57 |
+29:30:17.7 |
HIP 70835 |
6.53 |
| 2026-02-10 00:00 |
14:29:35.08 |
+29:32:26.9 |
HIP 70835 |
5.67 |
| 2026-02-10 12:00 |
14:29:32.48 |
+29:34:36.4 |
HIP 70835 |
5.59 |
| 2026-02-11 00:00 |
14:29:29.79 |
+29:36:46.0 |
HIP 70835 |
6.34 |
| 2026-02-11 12:00 |
14:29:27.00 |
+29:38:55.8 |
HIP 70835 |
7.68 |
| 2026-02-12 00:00 |
14:29:24.11 |
+29:41:05.7 |
HIP 70835 |
9.37 |
| 2026-02-12 12:00 |
14:29:21.13 |
+29:43:15.8 |
HIP 70835 |
11.26 |
| 2026-02-13 00:00 |
14:29:18.05 |
+29:45:26.0 |
HIP 70835 |
13.26 |
| 2026-02-13 12:00 |
14:29:14.88 |
+29:47:36.3 |
HIP 70835 |
15.34 |
| 2026-02-14 00:00 |
14:29:11.60 |
+29:49:46.6 |
HIP 70835 |
17.47 |
| 2026-02-14 12:00 |
14:29:08.23 |
+29:51:57.1 |
HIP 70835 |
19.63 |
| 2026-02-15 00:00 |
14:29:04.77 |
+29:54:07.7 |
HIP 70835 |
21.83 |
| 2026-02-15 12:00 |
14:29:01.20 |
+29:56:18.3 |
HIP 70835 |
24.05 |
| 2026-02-16 00:00 |
14:28:57.54 |
+29:58:29.0 |
HIP 70835 |
26.28 |
| 2026-02-16 12:00 |
14:28:53.79 |
+30:00:39.8 |
HIP 70775 |
25.77 |
| 2026-02-17 00:00 |
14:28:49.93 |
+30:02:50.5 |
HIP 70775 |
23.47 |
| 2026-02-17 12:00 |
14:28:45.99 |
+30:05:01.4 |
HIP 70775 |
21.17 |
| 2026-02-18 00:00 |
14:28:41.94 |
+30:07:12.2 |
HIP 70775 |
18.88 |
| 2026-02-18 12:00 |
14:28:37.80 |
+30:09:23.0 |
HIP 70775 |
16.61 |
| 2026-02-19 00:00 |
14:28:33.57 |
+30:11:33.9 |
HIP 70775 |
14.36 |
| 2026-02-19 12:00 |
14:28:29.24 |
+30:13:44.7 |
HIP 70775 |
12.16 |
| 2026-02-20 00:00 |
14:28:24.81 |
+30:15:55.4 |
HIP 70775 |
10.03 |
| 2026-02-20 12:00 |
14:28:20.29 |
+30:18:06.2 |
HIP 70775 |
8.06 |
| 2026-02-21 00:00 |
14:28:15.68 |
+30:20:16.9 |
HIP 70775 |
6.38 |
| 2026-02-21 12:00 |
14:28:10.97 |
+30:22:27.5 |
HIP 70775 |
5.31 |
| 2026-02-22 00:00 |
14:28:06.17 |
+30:24:38.1 |
HIP 70775 |
5.24 |
| 2026-02-22 12:00 |
14:28:01.27 |
+30:26:48.6 |
HIP 70775 |
6.20 |
| 2026-02-23 00:00 |
14:27:56.28 |
+30:28:59.0 |
HIP 70775 |
7.84 |
| 2026-02-23 12:00 |
14:27:51.20 |
+30:31:09.2 |
HIP 70775 |
9.83 |
| 2026-02-24 00:00 |
14:27:46.03 |
+30:33:19.4 |
HIP 70775 |
11.99 |