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) |
| 2026-05-12 00:00 |
14:02:54.66 |
+34:10:49.4 |
HIP 68521 |
15.80 |
| 2026-05-12 12:00 |
14:02:44.12 |
+34:11:04.3 |
HIP 68521 |
13.62 |
| 2026-05-13 00:00 |
14:02:33.63 |
+34:11:18.1 |
HIP 68521 |
11.46 |
| 2026-05-13 12:00 |
14:02:23.17 |
+34:11:30.9 |
HIP 68521 |
9.33 |
| 2026-05-14 00:00 |
14:02:12.75 |
+34:11:42.7 |
HIP 68521 |
7.23 |
| 2026-05-14 12:00 |
14:02:02.38 |
+34:11:53.4 |
HIP 68521 |
5.20 |
| 2026-05-15 00:00 |
14:01:52.05 |
+34:12:03.2 |
HIP 68521 |
3.35 |
| 2026-05-15 12:00 |
14:01:41.77 |
+34:12:12.0 |
HIP 68521 |
2.16 |
| 2026-05-16 00:00 |
14:01:31.53 |
+34:12:19.9 |
HIP 68521 |
2.68 |
| 2026-05-16 12:00 |
14:01:21.34 |
+34:12:26.7 |
HIP 68521 |
4.32 |
| 2026-05-17 00:00 |
14:01:11.19 |
+34:12:32.5 |
HIP 68521 |
6.25 |
| 2026-05-17 12:00 |
14:01:01.09 |
+34:12:37.4 |
HIP 68521 |
8.25 |
| 2026-05-18 00:00 |
14:00:51.05 |
+34:12:41.2 |
HIP 68521 |
10.28 |
| 2026-05-18 12:00 |
14:00:41.05 |
+34:12:44.1 |
HIP 68408 |
11.25 |
| 2026-05-19 00:00 |
14:00:31.10 |
+34:12:46.0 |
HIP 68408 |
10.34 |
| 2026-05-19 12:00 |
14:00:21.21 |
+34:12:47.0 |
HIP 68408 |
9.81 |
| 2026-05-20 00:00 |
14:00:11.37 |
+34:12:46.9 |
HIP 68408 |
9.70 |
| 2026-05-20 12:00 |
14:00:01.58 |
+34:12:46.0 |
HIP 68408 |
10.02 |
| 2026-05-21 00:00 |
13:59:51.85 |
+34:12:44.0 |
HIP 68408 |
10.73 |
| 2026-05-21 12:00 |
13:59:42.17 |
+34:12:41.1 |
HIP 68408 |
11.75 |
| 2026-05-22 00:00 |
13:59:32.54 |
+34:12:37.3 |
HIP 68408 |
13.01 |
| 2026-05-22 12:00 |
13:59:22.98 |
+34:12:32.5 |
HIP 68408 |
14.43 |
| 2026-05-23 00:00 |
13:59:13.47 |
+34:12:26.8 |
HIP 68408 |
15.97 |
| 2026-05-23 12:00 |
13:59:04.01 |
+34:12:20.2 |
HIP 68408 |
17.60 |
| 2026-05-24 00:00 |
13:58:54.62 |
+34:12:12.6 |
HIP 68408 |
19.29 |
| 2026-05-24 12:00 |
13:58:45.28 |
+34:12:04.1 |
HIP 68321 |
20.96 |
| 2026-05-25 00:00 |
13:58:36.01 |
+34:11:54.7 |
HIP 68321 |
21.35 |
| 2026-05-25 12:00 |
13:58:26.79 |
+34:11:44.4 |
HIP 68321 |
21.88 |
| 2026-05-26 00:00 |
13:58:17.64 |
+34:11:33.2 |
HIP 68147 |
20.67 |
| 2026-05-26 12:00 |
13:58:08.55 |
+34:11:21.0 |
HIP 68147 |
19.54 |
| 2026-05-27 00:00 |
13:57:59.52 |
+34:11:08.0 |
HIP 68147 |
18.54 |
| 2026-05-27 12:00 |
13:57:50.55 |
+34:10:54.1 |
HIP 68147 |
17.71 |
| 2026-05-28 00:00 |
13:57:41.65 |
+34:10:39.3 |
HIP 68147 |
17.06 |
| 2026-05-28 12:00 |
13:57:32.81 |
+34:10:23.6 |
HIP 68147 |
16.61 |
| 2026-05-29 00:00 |
13:57:24.03 |
+34:10:07.0 |
HIP 68147 |
16.37 |
| 2026-05-29 12:00 |
13:57:15.32 |
+34:09:49.6 |
HIP 68147 |
16.36 |
| 2026-05-30 00:00 |
13:57:06.68 |
+34:09:31.3 |
HIP 68147 |
16.56 |
| 2026-05-30 12:00 |
13:56:58.10 |
+34:09:12.2 |
HIP 68147 |
16.97 |
| 2026-05-31 00:00 |
13:56:49.58 |
+34:08:52.1 |
HIP 68147 |
17.56 |
| 2026-05-31 12:00 |
13:56:41.14 |
+34:08:31.3 |
HIP 68147 |
18.32 |
| 2026-06-01 00:00 |
13:56:32.76 |
+34:08:09.6 |
HIP 68147 |
19.22 |
| 2026-06-01 12:00 |
13:56:24.45 |
+34:07:47.0 |
HIP 68147 |
20.25 |
| 2026-06-02 00:00 |
13:56:16.21 |
+34:07:23.6 |
HIP 68147 |
21.37 |