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 |
2021-12-19 |
-4.4532 |
+2.177 |
| 2021-12-19 |
2022-02-25 |
-13.3606 |
+5.458 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
14:20:03.82 |
+32:33:33.6 |
HIP 70268 |
32.72 |
| 2026-03-26 12:00 |
14:19:53.97 |
+32:35:17.5 |
HIP 69819 |
33.53 |
| 2026-03-27 00:00 |
14:19:44.07 |
+32:37:00.7 |
HIP 69819 |
31.06 |
| 2026-03-27 12:00 |
14:19:34.11 |
+32:38:43.2 |
HIP 69819 |
28.62 |
| 2026-03-28 00:00 |
14:19:24.10 |
+32:40:24.9 |
HIP 69819 |
26.23 |
| 2026-03-28 12:00 |
14:19:14.04 |
+32:42:05.9 |
HIP 69819 |
23.90 |
| 2026-03-29 00:00 |
14:19:03.93 |
+32:43:46.1 |
HIP 69819 |
21.64 |
| 2026-03-29 12:00 |
14:18:53.77 |
+32:45:25.6 |
HIP 69819 |
19.49 |
| 2026-03-30 00:00 |
14:18:43.57 |
+32:47:04.3 |
HIP 69819 |
17.48 |
| 2026-03-30 12:00 |
14:18:33.31 |
+32:48:42.2 |
HIP 69819 |
15.67 |
| 2026-03-31 00:00 |
14:18:23.01 |
+32:50:19.3 |
HIP 69819 |
14.14 |
| 2026-03-31 12:00 |
14:18:12.66 |
+32:51:55.6 |
HIP 69819 |
12.98 |
| 2026-04-01 00:00 |
14:18:02.27 |
+32:53:31.2 |
HIP 69819 |
12.30 |
| 2026-04-01 12:00 |
14:17:51.83 |
+32:55:05.9 |
HIP 69819 |
12.18 |
| 2026-04-02 00:00 |
14:17:41.36 |
+32:56:39.8 |
HIP 69819 |
12.63 |
| 2026-04-02 12:00 |
14:17:30.84 |
+32:58:12.9 |
HIP 69819 |
13.60 |
| 2026-04-03 00:00 |
14:17:20.27 |
+32:59:45.2 |
HIP 69819 |
14.99 |
| 2026-04-03 12:00 |
14:17:09.67 |
+33:01:16.6 |
HIP 69857 |
16.03 |
| 2026-04-04 00:00 |
14:16:59.03 |
+33:02:47.2 |
HIP 69857 |
16.02 |
| 2026-04-04 12:00 |
14:16:48.35 |
+33:04:16.9 |
HIP 69857 |
16.46 |
| 2026-04-05 00:00 |
14:16:37.63 |
+33:05:45.8 |
HIP 69857 |
17.33 |
| 2026-04-05 12:00 |
14:16:26.88 |
+33:07:13.9 |
HIP 69857 |
18.56 |
| 2026-04-06 00:00 |
14:16:16.09 |
+33:08:41.0 |
HIP 69857 |
20.09 |
| 2026-04-06 12:00 |
14:16:05.27 |
+33:10:07.3 |
HIP 69857 |
21.85 |
| 2026-04-07 00:00 |
14:15:54.42 |
+33:11:32.8 |
HIP 69565 |
21.48 |
| 2026-04-07 12:00 |
14:15:43.53 |
+33:12:57.3 |
HIP 69565 |
20.14 |
| 2026-04-08 00:00 |
14:15:32.61 |
+33:14:20.9 |
HIP 69565 |
19.07 |
| 2026-04-08 12:00 |
14:15:21.66 |
+33:15:43.7 |
HIP 69565 |
18.31 |
| 2026-04-09 00:00 |
14:15:10.68 |
+33:17:05.6 |
HIP 69565 |
17.91 |
| 2026-04-09 12:00 |
14:14:59.67 |
+33:18:26.5 |
HIP 69565 |
17.89 |
| 2026-04-10 00:00 |
14:14:48.63 |
+33:19:46.6 |
HIP 69565 |
18.25 |
| 2026-04-10 12:00 |
14:14:37.57 |
+33:21:05.7 |
HIP 69565 |
18.97 |
| 2026-04-11 00:00 |
14:14:26.49 |
+33:22:23.9 |
HIP 69565 |
20.00 |
| 2026-04-11 12:00 |
14:14:15.37 |
+33:23:41.1 |
HIP 69565 |
21.30 |
| 2026-04-12 00:00 |
14:14:04.24 |
+33:24:57.5 |
HIP 69565 |
22.82 |
| 2026-04-12 12:00 |
14:13:53.08 |
+33:26:12.9 |
HIP 69565 |
24.52 |
| 2026-04-13 00:00 |
14:13:41.91 |
+33:27:27.3 |
HIP 69565 |
26.36 |
| 2026-04-13 12:00 |
14:13:30.71 |
+33:28:40.8 |
HIP 69565 |
28.32 |
| 2026-04-14 00:00 |
14:13:19.49 |
+33:29:53.4 |
HIP 69555 |
28.39 |
| 2026-04-14 12:00 |
14:13:08.26 |
+33:31:04.9 |
HIP 69555 |
28.40 |
| 2026-04-15 00:00 |
14:12:57.00 |
+33:32:15.6 |
HIP 69555 |
28.66 |
| 2026-04-15 12:00 |
14:12:45.74 |
+33:33:25.2 |
HIP 69555 |
29.18 |
| 2026-04-16 00:00 |
14:12:34.45 |
+33:34:33.9 |
HIP 69555 |
29.93 |