메타데이터
| 항목 |
값 |
| Designation |
C/2021 T1 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-10-14T01:40:49.874880Z |
| Orbit solution date (soln_date, UTC) |
2022-07-31T01:43:17Z |
| Obs used |
114 |
| NEO |
- |
| M1 |
11.500 |
| K1 |
13.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2021-10-02T04:59:50.640000Z |
| Discovery magnitude (MPC) |
20.04 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2021-12-07.0000000 |
| e |
0.99796291 |
| q (au) |
3.058012 |
| a (au) |
1501.163873 |
| i (deg) |
140.350038 |
| Ω (om, deg) |
56.816270 |
| ω (w, deg) |
51.501528 |
| M (ma, deg) |
0.000914 |
밝기
산란 + 전체 선형
$$
M_a = (10.107 + 5.998\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
10.107 |
| n |
5.998 |
| gf |
0.999 |
| gb |
-1.000 |
| k |
0.999 |
| δ90 |
9.999 |
| 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
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
16:19:48.40 |
-16:50:30.8 |
HIP 80072 |
18.12 |
| 2026-03-26 12:00 |
16:19:41.90 |
-16:50:22.6 |
HIP 80072 |
19.21 |
| 2026-03-27 00:00 |
16:19:35.32 |
-16:50:14.2 |
HIP 80072 |
20.37 |
| 2026-03-27 12:00 |
16:19:28.66 |
-16:50:05.6 |
HIP 80072 |
21.61 |
| 2026-03-28 00:00 |
16:19:21.92 |
-16:49:56.9 |
HIP 80072 |
22.90 |
| 2026-03-28 12:00 |
16:19:15.10 |
-16:49:48.1 |
HIP 80072 |
24.25 |
| 2026-03-29 00:00 |
16:19:08.20 |
-16:49:39.1 |
HIP 80072 |
25.65 |
| 2026-03-29 12:00 |
16:19:01.23 |
-16:49:30.0 |
HIP 80072 |
27.10 |
| 2026-03-30 00:00 |
16:18:54.18 |
-16:49:20.7 |
HIP 80072 |
28.58 |
| 2026-03-30 12:00 |
16:18:47.05 |
-16:49:11.2 |
HIP 80072 |
30.11 |
| 2026-03-31 00:00 |
16:18:39.85 |
-16:49:01.6 |
HIP 80072 |
31.67 |
| 2026-03-31 12:00 |
16:18:32.57 |
-16:48:51.9 |
HIP 80072 |
33.27 |
| 2026-04-01 00:00 |
16:18:25.21 |
-16:48:42.1 |
HIP 79895 |
34.56 |
| 2026-04-01 12:00 |
16:18:17.78 |
-16:48:32.0 |
HIP 79895 |
34.79 |
| 2026-04-02 00:00 |
16:18:10.28 |
-16:48:21.9 |
HIP 79895 |
35.12 |
| 2026-04-02 12:00 |
16:18:02.70 |
-16:48:11.6 |
HIP 79895 |
35.54 |
| 2026-04-03 00:00 |
16:17:55.05 |
-16:48:01.2 |
HIP 79895 |
36.06 |
| 2026-04-03 12:00 |
16:17:47.32 |
-16:47:50.6 |
HIP 79895 |
36.67 |
| 2026-04-04 00:00 |
16:17:39.52 |
-16:47:39.9 |
HIP 79895 |
37.36 |
| 2026-04-04 12:00 |
16:17:31.65 |
-16:47:29.1 |
HIP 79895 |
38.15 |
| 2026-04-05 00:00 |
16:17:23.71 |
-16:47:18.1 |
HIP 79895 |
39.01 |
| 2026-04-05 12:00 |
16:17:15.70 |
-16:47:07.0 |
HIP 79895 |
39.96 |
| 2026-04-06 00:00 |
16:17:07.61 |
-16:46:55.8 |
HIP 79895 |
40.99 |
| 2026-04-06 12:00 |
16:16:59.46 |
-16:46:44.5 |
HIP 79587 |
41.62 |
| 2026-04-07 00:00 |
16:16:51.23 |
-16:46:33.0 |
HIP 79587 |
39.71 |
| 2026-04-07 12:00 |
16:16:42.94 |
-16:46:21.4 |
HIP 79587 |
37.79 |
| 2026-04-08 00:00 |
16:16:34.57 |
-16:46:09.6 |
HIP 79587 |
35.86 |
| 2026-04-08 12:00 |
16:16:26.14 |
-16:45:57.8 |
HIP 79587 |
33.92 |
| 2026-04-09 00:00 |
16:16:17.64 |
-16:45:45.8 |
HIP 79587 |
31.98 |
| 2026-04-09 12:00 |
16:16:09.07 |
-16:45:33.7 |
HIP 79587 |
30.04 |
| 2026-04-10 00:00 |
16:16:00.44 |
-16:45:21.4 |
HIP 79587 |
28.10 |
| 2026-04-10 12:00 |
16:15:51.73 |
-16:45:09.1 |
HIP 79587 |
26.16 |
| 2026-04-11 00:00 |
16:15:42.97 |
-16:44:56.6 |
HIP 79587 |
24.24 |
| 2026-04-11 12:00 |
16:15:34.14 |
-16:44:44.0 |
HIP 79587 |
22.34 |
| 2026-04-12 00:00 |
16:15:25.24 |
-16:44:31.3 |
HIP 79587 |
20.47 |
| 2026-04-12 12:00 |
16:15:16.28 |
-16:44:18.5 |
HIP 79587 |
18.64 |
| 2026-04-13 00:00 |
16:15:07.25 |
-16:44:05.6 |
HIP 79587 |
16.88 |
| 2026-04-13 12:00 |
16:14:58.17 |
-16:43:52.6 |
HIP 79587 |
15.21 |
| 2026-04-14 00:00 |
16:14:49.02 |
-16:43:39.4 |
HIP 79587 |
13.69 |
| 2026-04-14 12:00 |
16:14:39.81 |
-16:43:26.2 |
HIP 79587 |
12.36 |
| 2026-04-15 00:00 |
16:14:30.54 |
-16:43:12.9 |
HIP 79587 |
11.30 |
| 2026-04-15 12:00 |
16:14:21.20 |
-16:42:59.4 |
HIP 79587 |
10.61 |
| 2026-04-16 00:00 |
16:14:11.81 |
-16:42:45.9 |
HIP 79587 |
10.37 |