메타데이터
| 항목 |
값 |
| Designation |
C/2019 T4 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2022-06-08T23:44:31.977600Z |
| Orbit solution date (soln_date, UTC) |
2025-09-30T13:39:20Z |
| Obs used |
5476 |
| NEO |
- |
| M1 |
4.400 |
| K1 |
10.250 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2019-10-09T13:58:04.368000Z |
| Discovery magnitude (MPC) |
19.39 c |
| Discovery observatory (MPC) |
T05 · ATLAS-HKO, Haleakala |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2023-02-14.0000000 |
| e |
0.99562110 |
| q (au) |
4.242148 |
| a (au) |
968.770059 |
| i (deg) |
53.632165 |
| Ω (om, deg) |
199.939253 |
| ω (w, deg) |
351.177452 |
| M (ma, deg) |
0.008172 |
밝기
산란 + 전체 선형
$$
M_a = (3.119 + 4.200\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
3.119 |
| n |
4.200 |
| gf |
0.989 |
| gb |
-0.743 |
| k |
1.000 |
| 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 |
| 2019-02-05 |
2021-02-02 |
+6.6976 |
-5.781 |
| 2021-02-02 |
2022-06-06 |
-0.8622 |
+0.130 |
| 2022-06-11 |
2025-10-20 |
+0.0696 |
-0.299 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
19:12:04.13 |
+33:13:17.5 |
HIP 94229 |
15.63 |
| 2026-09-20 12:00 |
19:12:03.50 |
+33:11:19.2 |
HIP 94229 |
16.41 |
| 2026-09-21 00:00 |
19:12:02.98 |
+33:09:20.8 |
HIP 94229 |
17.40 |
| 2026-09-21 12:00 |
19:12:02.55 |
+33:07:22.3 |
HIP 94229 |
18.56 |
| 2026-09-22 00:00 |
19:12:02.22 |
+33:05:23.7 |
HIP 94229 |
19.87 |
| 2026-09-22 12:00 |
19:12:01.99 |
+33:03:24.9 |
HIP 94229 |
21.30 |
| 2026-09-23 00:00 |
19:12:01.85 |
+33:01:26.1 |
HIP 94273 |
19.80 |
| 2026-09-23 12:00 |
19:12:01.81 |
+32:59:27.2 |
HIP 94273 |
18.06 |
| 2026-09-24 00:00 |
19:12:01.87 |
+32:57:28.2 |
HIP 94273 |
16.37 |
| 2026-09-24 12:00 |
19:12:02.03 |
+32:55:29.2 |
HIP 94273 |
14.78 |
| 2026-09-25 00:00 |
19:12:02.29 |
+32:53:30.2 |
HIP 94273 |
13.30 |
| 2026-09-25 12:00 |
19:12:02.64 |
+32:51:31.0 |
HIP 94273 |
11.99 |
| 2026-09-26 00:00 |
19:12:03.09 |
+32:49:31.9 |
HIP 94273 |
10.89 |
| 2026-09-26 12:00 |
19:12:03.64 |
+32:47:32.7 |
HIP 94273 |
10.10 |
| 2026-09-27 00:00 |
19:12:04.28 |
+32:45:33.6 |
HIP 94273 |
9.68 |
| 2026-09-27 12:00 |
19:12:05.02 |
+32:43:34.4 |
HIP 94273 |
9.67 |
| 2026-09-28 00:00 |
19:12:05.86 |
+32:41:35.2 |
HIP 94273 |
10.09 |
| 2026-09-28 12:00 |
19:12:06.79 |
+32:39:36.1 |
HIP 94273 |
10.89 |
| 2026-09-29 00:00 |
19:12:07.83 |
+32:37:36.9 |
HIP 94273 |
11.98 |
| 2026-09-29 12:00 |
19:12:08.95 |
+32:35:37.8 |
HIP 94273 |
13.30 |
| 2026-09-30 00:00 |
19:12:10.18 |
+32:33:38.7 |
HIP 94273 |
14.79 |
| 2026-09-30 12:00 |
19:12:11.50 |
+32:31:39.7 |
HIP 94273 |
16.40 |
| 2026-10-01 00:00 |
19:12:12.92 |
+32:29:40.7 |
HIP 94350 |
14.52 |
| 2026-10-01 12:00 |
19:12:14.43 |
+32:27:41.8 |
HIP 94350 |
12.53 |
| 2026-10-02 00:00 |
19:12:16.05 |
+32:25:43.0 |
HIP 94350 |
10.55 |
| 2026-10-02 12:00 |
19:12:17.75 |
+32:23:44.3 |
HIP 94350 |
8.59 |
| 2026-10-03 00:00 |
19:12:19.56 |
+32:21:45.6 |
HIP 94350 |
6.67 |
| 2026-10-03 12:00 |
19:12:21.46 |
+32:19:47.0 |
HIP 94350 |
4.83 |
| 2026-10-04 00:00 |
19:12:23.45 |
+32:17:48.6 |
HIP 94350 |
3.22 |
| 2026-10-04 12:00 |
19:12:25.54 |
+32:15:50.3 |
HIP 94350 |
2.37 |
| 2026-10-05 00:00 |
19:12:27.73 |
+32:13:52.1 |
HIP 94350 |
3.03 |
| 2026-10-05 12:00 |
19:12:30.01 |
+32:11:54.0 |
HIP 94350 |
4.58 |
| 2026-10-06 00:00 |
19:12:32.39 |
+32:09:56.1 |
HIP 94350 |
6.42 |
| 2026-10-06 12:00 |
19:12:34.87 |
+32:07:58.3 |
HIP 94350 |
8.35 |
| 2026-10-07 00:00 |
19:12:37.44 |
+32:06:00.7 |
HIP 94350 |
10.33 |
| 2026-10-07 12:00 |
19:12:40.10 |
+32:04:03.3 |
HIP 94350 |
12.33 |
| 2026-10-08 00:00 |
19:12:42.86 |
+32:02:06.0 |
HIP 94350 |
14.35 |
| 2026-10-08 12:00 |
19:12:45.72 |
+32:00:09.0 |
HIP 94350 |
16.38 |
| 2026-10-09 00:00 |
19:12:48.67 |
+31:58:12.1 |
HIP 94350 |
18.42 |
| 2026-10-09 12:00 |
19:12:51.71 |
+31:56:15.4 |
HIP 94350 |
20.46 |
| 2026-10-10 00:00 |
19:12:54.85 |
+31:54:19.0 |
HIP 94350 |
22.51 |
| 2026-10-10 12:00 |
19:12:58.08 |
+31:52:22.8 |
HIP 94576 |
23.81 |
| 2026-10-11 00:00 |
19:13:01.41 |
+31:50:26.9 |
HIP 94576 |
23.13 |